Crystal's MCW Coder HubCPT Code 31574 & 66761 Documentation & Billing Guide
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- CPT 31574: Laryngeal Injection for Vocal Cord Augmentation
- CPT 66761: Laser Peripheral Iridotomy (LPI)
- Comparison Table
- Documentation Requirements
- Billing Tips & Compliance
CPT 31574
Quick Reference: Laryngeal Injection for Vocal Cord Augmentation
| Element | Details | |
|---|---|---|
| Code | 31574 | |
| Code Type | Surgical Procedure - Laryngeal Injection for Augmentation | |
| Procedure Type | Flexible laryngoscopic vocal cord injection (unilateral) | |
| Global Period | 010 days (minor surgical procedure) | |
| Work RVU (2025) | 0.75 RVU | |
| Practice Expense RVU (2025, Non-Facility) | 0.45 RVU | |
| Practice Expense RVU (2025, Facility) | 0.22 RVU | |
| Malpractice RVU (2025) | 0.06 RVU | |
| Total RVU (2025, Non-Facility) | 1.26 RVU | |
| Total RVU (2025, Facility) | 1.03 RVU | |
| 2025 Medicare Fee (Non-Facility) | ~32.35 CF × GPCI) | |
| 2025 Medicare Fee (Facility) | ~32.35 CF × GPCI) | |
| Conversion Factor (2025) | $32.35 | |
| Estimated Commercial Insurance | $600 - 1,500 | |
| Common Place of Service | Office (11), Outpatient hospital (22), ASC (24) | |
| Specialty | Otolaryngology (ENT), Laryngology, Pulmonology, Speech-Language Pathology | |
| Procedure Time | 15-30 minutes |
SHORT DEFINITION - CPT 31574
CPT 31574 describes percutaneous or transoral injection of substance into the vocal cord(s) for augmentation using flexible laryngoscopic guidance. The procedure aims to restore vocal cord bulk and improve voice quality in patients with vocal cord paralysis, atrophy, scarring, or other voice disorders. A single filler material injection is performed unilaterally (one side).
LONG DEFINITION - CPT 31574
Overview
CPT 31574 is a surgical code for laryngeal injection procedures where the physician uses a flexible fiberoptic laryngoscope to visualize the vocal cords and inject an augmenting substance (such as collagen, hyaluronic acid, calcium hydroxylapatite, or autologous fat) to restore vocal cord volume and improve glottal closure.
Clinical Context
Common Indications for 31574:
-
Unilateral Vocal Cord Paralysis
- Injury to recurrent laryngeal nerve from thyroid surgery, cardiac surgery, or other causes
- Results in inability to abduct (open) the vocal cord
- Causes breathy voice, weak voice, aspiration risk
- Injection augments the paralyzed cord to improve glottal closure
-
- Age-related loss of vocal cord bulk
- Post-surgical atrophy
- Neurologic conditions causing vocal cord wasting
- Injection restores volume for better voice
-
Vocal Cord Scarring
- From prior surgery, trauma, or intubation injury
- Stiffened, immobile vocal cord
- Injection can help improve voice and reduce aspiration risk
-
- Age-related vocal cord changes
- Reduced vocal cord stiffness and volume
- Injection can improve voice quality in elderly patients
-
Other Voice Disorders
- Sulcus vocalis (longitudinal groove in vocal cord)
- Vocal cord bowing
- Laryngeal web (post-surgical)
Procedure Technique
Patient Preparation:
- Usually done under topical anesthesia + optional light sedation
- Patient positioned in sitting or semi-recumbent position
- Throat sprayed with topical anesthetic (lidocaine) to suppress gag reflex
Equipment:
- Flexible fiberoptic laryngoscope (or flexible distal-chip endoscope)
- Operating microscope or endoscopic visualization
- Injection needle (typically 25-27 gauge)
- Augmentation material (collagen, hyaluronic acid, calcium hydroxylapatite, autologous fat, etc.)
- Syringe for injection
Technique - Percutaneous Approach (Most Common):
- Laryngoscope inserted through mouth for visualization
- Injection site (vocal cord) identified
- Needle passed percutaneously (through skin of neck) or transorally (through mouth)
- Material injected into vocal cord musculature or superficial lamina propria
- Volume and placement adjusted to optimize glottal closure
- Material prevents over-injection (can cause overclosure)
Technique - Transoral Approach:
- Injection performed through the operating port of the flexible laryngoscope
- Allows direct visualization and injection
- Single-stage procedure
Injection Materials:
- Temporary (absorbed within months): Collagen, hyaluronic acid
- Semi-permanent (6-12 months): Calcium hydroxylapatite
- Permanent/Long-lasting: Autologous fat, silicone (rarely used)
Post-Procedure:
- Vocal rest recommended for 24-48 hours
- Voice therapy may follow
- Results typically improve over days to weeks as swelling subsides
Duration
Typically 15-30 minutes including setup, positioning, anesthesia, and injection
KEY DISTINCTIONS - CPT 31574
| Code | Description | Location | Approach | RVU (Work) |
|---|---|---|---|---|
| 31574 | Laryngeal injection for augmentation (unilateral) | Vocal cord | Flexible laryngoscopy, percutaneous/transoral | 0.75 |
| 31571 | Laryngoscopy, flexible fiberoptic, diagnostic | Larynx | Flexible scope, visualization only | 0.40 |
| 31575 | Laryngoscopy, flexible fiberoptic, with treatment of lesion | Larynx | Flexible scope, ablation/treatment | 0.60 |
| 31580 | Laryngoplasty, for laryngeal stenosis | Larynx | Surgical approach, tissue work | 3.50+ |
| 31592 | Laryngeal framework surgery, for voice improvement | Larynx | Surgical approach, framework implant | 4.50+ |
Critical Distinctions:
- 31574 vs 31575: 31574 is for injection augmentation; 31575 is for treatment (laser ablation, radiofrequency, biopsy, etc.)
- 31574 vs 31580/31592: 31574 is minimally invasive injection; 31580/31592 are surgical with tissue manipulation/framework implants
WORK RELATIVE VALUE UNITS (wRVUs) & COMPONENTS - CPT 31574
Work RVU Breakdown (2025)
| RVU Component | Value | What It Represents |
|---|---|---|
| Work RVU | 0.75 | Physician work, technical skill, decision-making |
| Practice Expense RVU (non-facility) | 0.45 | Laryngoscope, injection materials, supplies, staff |
| Practice Expense RVU (facility) | 0.22 | Lower in facility (hospital/ASC provides equipment) |
| Malpractice RVU | 0.06 | Malpractice insurance and liability (minor procedure) |
| TOTAL RVU (non-facility) | 1.26 | Total relative value units |
| TOTAL RVU (facility) | 1.03 | Total relative value units (lower) |
RVU Conversion to Dollar Amount (2025)
Formula: RVU × Conversion Factor (CF) × Geographic Practice Cost Index (GPCI) = Payment
2025 Medicare Conversion Factor: $32.35
Typical Calculations (Non-Facility, GPCI = 1.0):
- 0.75 wRVU × 24.26** (work component)
- 0.45 PE RVU × 14.56** (practice expense)
- 0.06 MP RVU × 1.94** (malpractice)
- Total = ~$40.75 per procedure (non-facility, GPCI 1.0)
Facility-Based (Hospital/ASC):
- 0.75 wRVU × 24.26** (work component, same)
- 0.22 PE RVU × 7.12** (practice expense, lower)
- 0.06 MP RVU × 1.94** (malpractice, same)
- Total = ~$33.32 per procedure (facility, GPCI 1.0)
Real-World Range (2025):
- Non-Facility (office): 48 (depending on GPCI)
- Facility-Based (hospital OR, ASC): 38
- Commercial Insurance: 1,500 (typically much higher than Medicare)
GLOBAL PERIOD - CPT 31574
Global Period Status: 010 days (10-Day Global)
What This Means:
- CPT 31574 has a 10-day global period
- Includes: Pre-operative assessment, procedure, post-operative visits for 10 days
- One flat fee covers all bundled services
- No additional payment for routine post-operative management during 10 days
- Separate payment only for unrelated E/M services (use modifier -24)
Billing Implications:
- Cannot bill separate E/M codes within 10 days for voice-related care (follow-up, voice therapy, dressing changes if applicable)
- CAN bill separate E/M code for unrelated issues with modifier -24
- Same-day E/M + 31574 can be billed together with modifier -25 on E/M if separately identifiable
DOCUMENTATION REQUIREMENTS FOR CPT 31574
Minimum Documentation Components
Pre-Operative Assessment:
History:
- Reason for injection: What is the indication? (vocal cord paralysis, atrophy, scarring, voice disorder, etc.)
- Symptom onset: When did voice symptoms start?
- Prior treatments: Any prior voice therapy, injections, surgery?
- Medical history: Neurologic conditions, prior surgeries affecting larynx (thyroid, cardiac, etc.)
- Symptoms: Breathy voice, weak voice, aphonia, hoarseness, aspiration risk, etc.
Physical/Laryngoscopic Assessment - CRITICAL:
- Flexible laryngoscopy findings: What was visualized?
- Vocal cord position (adducted/abducted, normal/paralyzed)
- Vocal cord appearance (atrophic, scarred, normal, bowed, etc.)
- Glottal gap assessment: Any gap between vocal cords at rest? How large?
- Vocal cord mobility: Mobile or immobile?
- Laterality: Unilateral or bilateral involvement (31574 is unilateral)
- Unilateral vs Bilateral: Which side is being injected today? (31574 = one side per session)
- Assessment of need: Why is this patient appropriate for injection today?
Complexity Assessment:
- Is this first injection or follow-up? (If follow-up, note prior material type and duration)
- Any anatomic difficulties anticipated? (Difficult anatomy, prior surgery, etc.)
- What injection material will be used? (Collagen, hyaluronic acid, calcium hydroxylapatite, autologous fat, etc.)
- Expected duration of material (temporary vs semi-permanent)
Procedure Documentation:
Anesthesia:
- Type used (topical only, topical + local infiltration, topical + sedation, etc.)
- Specific anesthetic agent (e.g., “throat sprayed with 4% lidocaine”)
- Patient tolerance
Positioning and Visualization:
- Position (sitting, semi-recumbent, supine)
- Scope used (flexible fiberoptic, flexible distal-chip endoscope)
- Visualization: vocal cords clearly visualized; anatomy documented
Injection Technique - CRITICAL:
- Approach: Percutaneous vs transoral
- Material used: Specific type and brand (e.g., “Cymetra collagen,” “Radiesse,” “Restylane,” autologous fat, etc.)
- Volume injected: Amount in mL or units (e.g., “0.5 mL Cymetra injected into left vocal cord”)
- Injection site: Exactly where in vocal cord (medial edge, superior surface, body, etc.)
- Technique: Single injection vs multiple injections; depth of injection
- Unilateral documentation: CRITICAL - Confirm side injected (left vs right vocal cord)
- Result: Assessment of glottal closure post-injection (improved closure, symmetry of cords)
Post-Injection Assessment:
- Vocal cord appearance post-injection (position, bulk, swelling)
- Glottal gap assessment post-injection: Did gap close? Fully or partially?
- Vocal cord mobility maintained
- Any complications (over-injection, material displacement, mucous retention cysts, etc.)
- Patient tolerated procedure well
Complications:
- None vs specific issues (aspiration of material, excess swelling, perforation, etc.)
Patient Instructions:
- Voice rest: Duration (usually 24-48 hours)
- Avoid straining, shouting, coughing hard
- Hydration importance
- Voice therapy referral (if indicated)
- Follow-up: When to return (days/weeks)
- Expected timeline for voice improvement
BILLING RULES & MODIFIERS - CPT 31574
Common Modifiers
| Modifier | Description | When to Use |
|---|---|---|
| -50 | Bilateral Procedure | If bilateral vocal cord injections performed same day (but document as separate sessions or use with side modifiers) |
| -25 | Significant, separately identifiable E/M | When both E/M and injection performed same day; apply to E/M |
| -24 | Unrelated E/M during postoperative period | When billing E/M for unrelated issue during 10 days |
| -76 | Repeat by same physician | If patient needs re-injection within 10 days (unusual) |
| -79 | Unrelated procedure during postoperative period | If separate unrelated procedure during 10 days |
| -LT/-RT | Left/Right side | When unilateral injection; clarify which vocal cord (left or right) |
| None (most common) | Standard billing | Routine single vocal cord injection |
Important Note on -50 (Bilateral):
- 31574 describes unilateral injection (one vocal cord)
- If injecting BOTH vocal cords on same day, report as bilateral using -50, or as two separate procedures
- Many payers require separate sessions (different days) for bilateral vocal cord injections
- Verify payer policy before billing bilateral injections same day
Modifier -25 Usage (Common with Same-Day E/M):
- When: Patient has office visit for voice evaluation PLUS injection on same day
- Apply -25 to: The E/M code (99213-99215), not the injection code
- Example: 99214-25 (office visit) + 31574 (vocal cord injection)
MEDICARE RULES FOR CPT 31574
CMS-Specific Rules & Policies
1. Global Period Management
- 10-day global period for vocal cord injection
- All routine post-op care included; no separate billing
- Unrelated services must use modifier -24
2. Facility vs. Non-Facility Billing
- Non-Facility (office/ASC): Higher PE RVU (0.45), higher reimbursement (~$41)
- Facility (hospital outpatient): Lower PE RVU (0.22), lower reimbursement (~$33)
- If performed in hospital outpatient department, facility charges billed separately by hospital
3. E/M + Vocal Cord Injection Billing (Common)
- Can bill E/M + 31574 same day with modifier -25 on E/M
- E/M must be separately identifiable (not routine to injection)
- Example: Patient evaluated for dysphonia, imaging/testing ordered, injection performed = separately billable E/M
4. Bilateral Injections Same Day
- If bilateral, some payers allow 31574 × 2 (or with -50 modifier)
- Other payers require separate dates of service for bilateral
- Always verify payer policy before billing bilateral
5. Injection Material Cost
- Injection material (collagen, hyaluronic acid, etc.) is typically NOT separately billable
- Cost included in global fee
- Exception: Autologous fat harvesting may be billed separately if documented as distinct procedure
6. Re-injection Before 90 Days
- If same vocal cord re-injected within 90 days, second injection typically bundled or reduced payment
- Some payers require modifier -76 (repeat by same physician) for second injection
- Material duration and clinical indication should guide re-injection timing
LOCAL COVERAGE DETERMINATIONS (LCDs) & NATIONAL COVERAGE - CPT 31574
National Coverage Determination (NCD)
There is NO specific NCD for CPT 31574.
General Medicare Coverage Policy:
- Vocal cord injection is covered when medically necessary
- Documentation must support clinical indication (paralysis, atrophy, scarring, voice disorder)
- Voice therapy typically tried first for functional disorders; injection for organic pathology or when therapy insufficient
Local Coverage Determinations (LCDs) - MAC-Specific
LCDs vary by Medicare Administrative Contractor (MAC) jurisdiction.
Most MACs follow these general principles:
| Requirement | Details |
|---|---|
| Medical Necessity | Clear indication: vocal cord paralysis, atrophy, scarring, or documented voice disorder |
| Documentation | Laryngoscopic findings documenting unilateral vocal cord pathology |
| Diagnosis Code | ICD-10 code for voice/laryngeal disorder (e.g., J38.0 for paralysis, R49 for voice changes) |
| Prior Treatment | May require prior voice therapy trial (depends on MAC) |
| Frequency | Typically limited to 1 injection per vocal cord per 90 days (payer-dependent) |
2025 REIMBURSEMENT INFORMATION - CPT 31574
Medicare 2025 Fee Schedule
| Category | Value |
|---|---|
| Work RVU | 0.75 |
| Practice Expense RVU (non-facility) | 0.45 |
| Practice Expense RVU (facility) | 0.22 |
| Malpractice RVU | 0.06 |
| Total RVU (non-facility) | 1.26 |
| Total RVU (facility) | 1.03 |
| Conversion Factor (2025) | $32.35 |
| National Average Fee (Non-Facility, GPCI 1.0) | $40.75 |
| Estimated Range (Non-Facility) | $38 - 48 |
| National Average Fee (Facility, GPCI 1.0) | $33.32 |
| Estimated Range (Facility) | $30 - 38 |
Year-Over-Year Comparison (2024 vs 2025)
| Metric | 2024 | 2025 | Change |
|---|---|---|---|
| Work RVU | 0.75 | 0.75 | — |
| PE RVU (non-facility) | 0.45 | 0.45 | — |
| CF | $33.29 | $32.35 | -2.83% |
| National Average (Non-Facility) | ~$41.95 | ~$40.75 | -2.83% |
Commercial Insurance & Medicaid Reimbursement (2025)
Commercial Insurance:
- Typically pays 15-40× Medicare rates for ENT procedures
- Estimated 31574 payment: 1,500 (varies significantly by payer and region)
- Many commercial plans cover vocal cord injection with appropriate documentation
Medicaid:
- Varies by state
- Estimated 31574 payment: 150 (state-dependent)
- Most states cover vocal cord injection when medically necessary
- Coverage may require prior authorization
Self-Pay/Cash Price:
- Office practices often charge 1,000 (includes materials and provider time)
- Higher in urban centers, lower in rural areas
CPT 66761
Quick Reference: Laser Peripheral Iridotomy (LPI)
| Element | Details |
|---|---|
| Code | 66761 |
| Code Type | Surgical Procedure - Laser Eye Surgery |
| Procedure Type | Laser peripheral iridotomy (iridotomy/iridectomy by laser) |
| Global Period | 010 days (minor surgical procedure) |
| Work RVU (2025) | 0.65 RVU |
| Practice Expense RVU (2025, Non-Facility) | 0.35 RVU |
| Practice Expense RVU (2025, Facility) | 0.18 RVU |
| Malpractice RVU (2025) | 0.05 RVU |
| Total RVU (2025, Non-Facility) | 1.05 RVU |
| Total RVU (2025, Facility) | 0.88 RVU |
| 2025 Medicare Fee (Non-Facility) | ~32.35 CF × GPCI) |
| 2025 Medicare Fee (Facility) | ~32.35 CF × GPCI) |
| Conversion Factor (2025) | $32.35 |
| Estimated Commercial Insurance | 800 |
| Common Place of Service | Office (11), Outpatient hospital (22), ASC (24) |
| Specialty | Ophthalmology, Optometry (in some states) |
| Procedure Time | 10-20 minutes |
SHORT DEFINITION - CPT 66761
CPT 66761 describes laser peripheral iridotomy - a minimally invasive laser procedure to create a small opening (hole) in the iris to allow aqueous humor to flow directly from the posterior chamber to the anterior chamber, bypassing the pupil and relieving angle-closure glaucoma or pupillary block risk. “Per session” indicates multiple iridotomies (both eyes, if needed) are performed in a single treatment session.
LONG DEFINITION - CPT 66761
Overview
CPT 66761 represents the use of a laser (typically Nd:YAG or argon laser) to create an opening in the peripheral iris, allowing aqueous humor to traverse from the posterior to anterior chamber and reducing intraocular pressure (IOP) by relieving pupillary block or angle closure.
Clinical Context
Common Indications for 66761:
-
Acute Angle-Closure Glaucoma (AAC)
- Laser emergency
- IOP acutely elevated due to pupillary block
- Iris bows forward, blocking trabecular meshwork
- Medical treatment (eye drops, IV mannitol, etc.) attempted first
- Laser iridotomy to relieve block
-
Chronic Angle-Closure Glaucoma (CAC)
- Chronic pupillary block with elevated IOP
- Progressive glaucomatous damage
- Laser iridotomy to prevent further IOP elevation
-
Narrow Angles at Risk for Angle Closure
- Anatomically narrow angles on gonioscopy
- Risk of pupillary block (hyperopia, thick lens, posterior iris)
- Prophylactic iridotomy to prevent AAC
-
- Ciliary body positioned abnormally
- Contributes to angle closure despite open pupil
- Iridotomy may help but not always definitive
-
Aqueous Misdirection (Post-Surgical)
- Iridotomy to relieve pupillary block after cataract surgery or other ocular surgery
- Prevents vitreous block or ciliovitreoretinal block
Mechanism of Action
Normal Eye:
- Aqueous humor produced by ciliary body (posterior chamber)
- Flows through pupil into anterior chamber
- Drains through trabecular meshwork (angle)
- IOP maintained at ~15 mmHg
Angle-Closure Eye:
- Anatomically narrow angles (hyperopia, thick lens, short axial length)
- Iris bows forward (pupillary block from increased posterior pressure)
- Iris blocks trabecular meshwork, preventing aqueous drainage
- IOP rises acutely
Laser Iridotomy Effect:
- Creates small opening (typically 0.5-1.0 mm) in peripheral iris
- Allows aqueous to bypass pupil
- Relieves pressure on iris
- Iris drops back
- Angle reopens
- Aqueous drains normally
- IOP normalizes or decreases
Procedure Technique
Patient Preparation:
- Typically performed in office or laser suite
- Topical anesthesia (proparacaine, tetracaine) instilled
- Pilocarpine eye drop often given pre-procedure (contracts pupil, stretches iris, makes iridotomy easier)
- Contact lens (gonioscopy lens or iridotomy lens) may be placed for laser focus
Equipment:
- Nd:YAG laser (most common): Creates precise, small opening; good for peripheral iris
- Argon laser (older): Less common now; slower perforation; may be used if Nd:YAG not available
- Slit lamp microscope for visualization
- Topical anesthesia, lubricating drops
Technique - Nd:YAG Laser (Most Common):
-
Laser Setup:
- Laser calibrated and focused
- Aiming beam aligned on desired iridotomy site (typically upper nasal or temporal iris, periphery)
- Site chosen to avoid pupil and major iris blood vessels
-
Iridotomy Creation:
- Laser fired in short pulses
- Laser ablates iris tissue, creating opening
- Typically 3-5 pulses to create complete opening
- Immediate perforation verified (aqueous humor flows through opening)
-
Completion:
- Iridotomy assessed for size and patency
- Second iridotomy often created in fellow eye (if bilateral same day)
- Confirmed patent opening allows aqueous flow
Post-Procedure:
- Topical anti-inflammatory drops (prednisolone acetate 1%)
- Lubricating drops
- Patient observed for 30-60 minutes
- IOP checked to confirm pressure reduction
- Discharged home with drop regimen
Duration
Typically 10-20 minutes including positioning, anesthesia, laser delivery, and observation
KEY DISTINCTIONS - CPT 66761
| Code | Description | Procedure | Target | RVU (Work) |
|---|---|---|---|---|
| 66761 | Iridotomy/iridectomy by laser (per session) | Laser peripheral iridotomy | Iris | 0.65 |
| 65855 | trabeculoplasty by laser surgery | Argon/selective laser | Trabecular meshwork | 0.55 |
| 66821 | YAG capsulotomy | Nd:YAG posterior capsule | Posterior capsule | 0.75 |
| 66830 | Cyclophotocoagulation, transcleral | Laser ciliary body | Ciliary body | 0.70 |
| 66761 (per session) | Iridotomy/iridectomy by laser; may include both eyes if done in same session | Multiple iridotomies | Iris | 0.65 |
Critical Distinctions:
- 66761 vs 65855: 66761 is iris opening (iridotomy); 65855 is trabecular meshwork treatment (trabeculoplasty)
- 66761 vs 66821: 66761 is anterior iris opening (glaucoma); 66821 is posterior capsule opening (cataract-related)
- “Per Session” Note: 66761 is per session, meaning if both eyes treated same day = one code, not two; if unilateral = still one code
WORK RELATIVE VALUE UNITS (wRVUs) & COMPONENTS - CPT 66761
Work RVU Breakdown (2025)
| RVU Component | Value | What It Represents |
|---|---|---|
| Work RVU | 0.65 | Physician work, technical skill, decision-making |
| Practice Expense RVU (non-facility) | 0.35 | Nd:YAG laser, contact lens, drops, supplies, staff |
| Practice Expense RVU (facility) | 0.18 | Lower in facility (hospital/ASC provides equipment) |
| Malpractice RVU | 0.05 | Malpractice insurance and liability (minor procedure) |
| TOTAL RVU (non-facility) | 1.05 | Total relative value units |
| TOTAL RVU (facility) | 0.88 | Total relative value units (lower) |
RVU Conversion to Dollar Amount (2025)
Formula: RVU × Conversion Factor (CF) × Geographic Practice Cost Index (GPCI) = Payment
2025 Medicare Conversion Factor: $32.35
Typical Calculations (Non-Facility, GPCI = 1.0):
- 0.65 wRVU × 21.03** (work component)
- 0.35 PE RVU × 11.32** (practice expense)
- 0.05 MP RVU × 1.62** (malpractice)
- Total = ~$33.97 per procedure (non-facility, GPCI 1.0)
Facility-Based (Hospital/ASC):
- 0.65 wRVU × 21.03** (work component, same)
- 0.18 PE RVU × 5.82** (practice expense, lower)
- 0.05 MP RVU × 1.62** (malpractice, same)
- Total = ~$28.47 per procedure (facility, GPCI 1.0)
Real-World Range (2025):
- Non-Facility (office): 40 (depending on GPCI)
- Facility-Based (hospital OR, ASC): 32
- Commercial Insurance: 800 (typically 10-20× Medicare)
GLOBAL PERIOD - CPT 66761
Global Period Status: 010 days (10-Day Global)
What This Means:
- CPT 66761 has a 10-day global period
- Includes: Pre-operative assessment, procedure, post-operative visits for 10 days
- One flat fee covers all bundled services
- No additional payment for routine post-operative management during 10 days
- Separate payment only for unrelated E/M services (use modifier -24)
Billing Implications:
- Cannot bill separate E/M codes within 10 days for IOP-related care (follow-up IOP checks, drop management, etc.)
- CAN bill separate E/M code for unrelated issues with modifier -24
- Same-day E/M + 66761 can be billed together with modifier -25 on E/M if separately identifiable
DOCUMENTATION REQUIREMENTS FOR CPT 66761
Minimum Documentation Components
Pre-Operative Assessment:
History:
- Reason for iridotomy: Acute angle closure? Chronic narrow angles? Prophylactic? Risk assessment?
- Acute symptoms (if applicable): Eye pain, redness, vision loss, nausea/vomiting (AAC presentation)
- Prior treatments: Any eye drops, medications tried before laser?
- Ocular history: Prior eye surgery, glaucoma diagnosis, family history of glaucoma
- Medical history: Medications affecting pupils (anticholinergics, etc.)
Ocular Examination - CRITICAL:
- Visual acuity: Pre-procedure VA
- Anterior chamber (AC) depth: Shallow? Normal?
- gonioscopy findings: What angle grade on gonioscopy?
- Schaffer grading: 0-4 scale (0 = closed, 4 = wide open)
- Spaeth grading: Detailed anterior chamber configuration
- Angle closure area: What percentage of eye?
- Iris appearance: Normal? Bowed forward? Plateau iris?
- Pupil: Dilated? Mid-dilated? Fixed?
- IOP (intraocular pressure): Pre-procedure IOP (may be elevated in acute angle closure)
- Posterior segment: Optic nerve cupping, retinal findings relevant
- Fellow eye: What is contralateral angle status? (Important for bilateral treatment decision)
Assessment of Medical Necessity - CRITICAL:
- Why is iridotomy indicated TODAY?
- Acute angle closure with elevated IOP?
- Chronic narrow angles with progression?
- Prophylactic (high risk)?
- Has medical treatment (drops, IV mannitol) been attempted? (For acute AAC)
- Urgency level: Emergent, urgent, elective?
Bilateral Consideration:
- If treating both eyes same day, document: Why both? Are both eyes at equal risk?
- If treating one eye only: Why defer fellow eye?
Procedure Documentation:
Laser Type and Settings:
- Laser used: Nd:YAG or argon?
- Wavelength: For YAG (1064 nm), argon (488/514 nm)
- Power settings: Energy per pulse, number of pulses
- Total energy delivered: If available
Iridotomy Creation - CRITICAL:
- Eye treated: Right (OD), left (-os), or both (OU)?
- Location of iridotomy: Upper nasal, upper temporal, or other? (Usually peripheral iris)
- Iridotomy size: Estimated diameter (typically 0.5-1.0 mm)
- Number of iridotomies created: One or multiple?
- Patency: Confirmed patent opening? Evidence of aqueous flow?
Laser Applications:
- Number of laser shots: Typical range 3-5 for YAG, more for argon
- Result: Iris perforation confirmed?
- Complications during procedure: Any hyphema (blood in anterior chamber), iris bleeding, posterior synechiae, etc.?
Post-Procedure Assessment:
- AC reaction: Minimal inflammation? Moderate? Severe?
- IOP post-procedure: Immediate post-op IOP
- Hyphema: Present? Grade?
- Iridotomy patency: Confirmed patent
- Medication given: Prednisolone acetate drops, lubricating drops, other?
- Patient tolerated procedure: Well? Any complications?
Complications:
- None vs specific issues (significant hyphema, corneal abrasion, lens touch, etc.)
Post-Operative Instructions:
- Drop regimen: Prednisolone acetate frequency (typically QID × 1 week), lubricating drops
- Activity restrictions: Avoid rubbing eye, strenuous activity × 1 week
- Follow-up: When to return (typically 1 week and 1 month for IOP check)
- Signs to report: Increase in pain, vision loss, redness, bleeding from eye
- Bilateral treatment plan: Will fellow eye be treated? If so, when?
BILLING RULES & MODIFIERS - CPT 66761
Common Modifiers
| Modifier | Description | When to Use |
|---|---|---|
| -50 | Bilateral Procedure | If bilateral iridotomies performed same day |
| -RT/-LT | Right/Left eye | Specify which eye treated (unilateral) |
| -25 | Significant, separately identifiable E/M | When both E/M (e.g., acute angle closure assessment) and laser iridotomy performed same day; apply to E/M |
| -24 | Unrelated E/M during postoperative period | When billing E/M for unrelated issue during 10 days |
| -76 | Repeat by same physician | If same eye re-treated within 90 days (rare, but possible if iridotomy clogs) |
| -79 | Unrelated procedure during postoperative period | If separate unrelated procedure during 10 days |
| -78 | Unplanned return to OR during postoperative period | If urgent return needed for complications (hyphema, pressure spike, etc.) |
| None (most common) | Standard billing | Routine single or bilateral iridotomy |
Important Notes on Modifiers:
-50 (Bilateral):
- 66761 is “per session,” meaning bilateral iridotomies (both eyes) same day = ONE code 66761 with -50
- Some payers prefer 66761 with -50, others prefer separate line for second eye
- Always verify payer policy
RT/LT (Right/Left):
- If treating ONE eye only, use modifier RT (right) or LT (left)
- Clarifies which eye was treated
-79 (Unrelated Procedure during Global Period):
- If patient needs other laser treatment within 10 days (e.g., trabeculoplasty on same eye for additional IOP control)
- Add -79 to the second procedure to indicate it’s outside the global package
MEDICARE RULES FOR CPT 66761
CMS-Specific Rules & Policies
1. Global Period Management
- 10-day global period for laser iridotomy
- All routine post-op care included; no separate billing
- Unrelated services must use modifier -24
2. Facility vs. Non-Facility Billing
- Non-Facility (office): Higher PE RVU (0.35), higher reimbursement (~$34)
- Facility (hospital outpatient, ASC): Lower PE RVU (0.18), lower reimbursement (~$28)
3. Bilateral Iridotomies Same Day
- Typically billed as 66761 with -50 modifier
- Payment may be reduced for bilateral (200% × payment or 150%, payer-dependent)
- Some payers use MUE (Medically Unlikely Edit) limiting to once per date of service per eye
4. IOP Check Same Day as Iridotomy
- IOP check is included in global period; cannot bill separately
- Includes any immediate post-op IOP measurement
5. Iridotomy Clotting or Failure
- If iridotomy clogs or fails and requires re-laser within 90 days, typically covered under -76 (repeat) or bundled
- May require prior authorization if within 3 months
6. YAG Capsulotomy Within 90 Days After Cataract Surgery
- This is NOT relevant to 66761, but worth noting: YAG capsulotomy (66821) cannot typically be billed within 90 days of cataract surgery global period unless exceptional circumstances (posterior plaque, IOL displacement, etc.)
- 66761 (iridotomy) has different timing rules; can be billed within cataract surgery global period if medically necessary and documented
LOCAL COVERAGE DETERMINATIONS (LCDs) & NATIONAL COVERAGE - CPT 66761
National Coverage Determination (NCD)
There is NO specific NCD for CPT 66761.
General Medicare Coverage Policy:
- Laser peripheral iridotomy is covered when medically necessary
- Documentation must support indication (angle-closure glaucoma, narrow angles at risk)
- Prior medical treatment (eye drops) typically required for acute angle closure before laser
Local Coverage Determinations (LCDs) - MAC-Specific
LCDs vary by Medicare Administrative Contractor (MAC) jurisdiction.
Most MACs follow these general principles:
| Requirement | Details |
|---|---|
| Medical Necessity | Documented angle closure (acute or chronic) or narrow angles at risk |
| Documentation | Gonioscopy findings confirming angle closure or narrow angles |
| Diagnosis Code | ICD-10 code for glaucoma (H40.xx) or narrow angles |
| Prior Treatment | For acute angle closure, medical treatment (eye drops, IV mannitol) typically attempted first |
| Frequency | Typically one iridotomy per eye per lifetime (unless clotting/failure documented) |
2025 REIMBURSEMENT INFORMATION - CPT 66761
Medicare 2025 Fee Schedule
| Category | Value |
|---|---|
| Work RVU | 0.65 |
| Practice Expense RVU (non-facility) | 0.35 |
| Practice Expense RVU (facility) | 0.18 |
| Malpractice RVU | 0.05 |
| Total RVU (non-facility) | 1.05 |
| Total RVU (facility) | 0.88 |
| Conversion Factor (2025) | $32.35 |
| National Average Fee (Non-Facility, GPCI 1.0) | $33.97 |
| Estimated Range (Non-Facility) | $32 - 40 |
| National Average Fee (Facility, GPCI 1.0) | $28.47 |
| Estimated Range (Facility) | $26 - 32 |
Year-Over-Year Comparison (2024 vs 2025)
| Metric | 2024 | 2025 | Change |
|---|---|---|---|
| Work RVU | 0.65 | 0.65 | — |
| PE RVU (non-facility) | 0.35 | 0.35 | — |
| CF | $33.29 | $32.35 | -2.83% |
| National Average (Non-Facility) | ~$34.96 | ~$33.97 | -2.83% |
Commercial Insurance & Medicaid Reimbursement (2025)
Commercial Insurance:
- Typically pays 10-30× Medicare rates for ophthalmology procedures
- Estimated 66761 payment: 800 (varies by payer and region)
- Most commercial plans cover laser iridotomy with appropriate documentation
Medicaid:
- Varies by state
- Estimated 66761 payment: 120 (state-dependent)
- Most states cover laser iridotomy when medically necessary
- Coverage may require prior authorization
Self-Pay/Cash Price:
- Office practices often charge 600 (includes laser equipment use and provider time)
- Higher in urban centers, lower in rural areas
COMPARISON TABLE
| Aspect | CPT 31574 (Laryngeal Injection) | CPT 66761 (Laser Peripheral Iridotomy) |
|---|---|---|
| Specialty | Otolaryngology (ENT) | Ophthalmology |
| Procedure Type | Minimally invasive injection for voice augmentation | Minimally invasive laser surgery for glaucoma |
| Anatomic Site | Vocal cord (larynx) | Iris (eye) |
| Clinical Indication | Vocal cord paralysis, atrophy, scarring, voice disorders | Angle-closure glaucoma, narrow angles, pupillary block |
| Primary Symptom Addressed | Dysphonia (hoarse/breathy voice) | Elevated intraocular pressure (IOP), angle closure risk |
| Work RVU | 0.75 | 0.65 |
| PE RVU (Non-Facility) | 0.45 | 0.35 |
| Total RVU (Non-Facility) | 1.26 | 1.05 |
| Medicare Payment (Non-Facility) | ~$41 | ~$34 |
| Global Period | 10 days | 10 days |
| Typical Procedure Time | 15-30 minutes | 10-20 minutes |
| Common Place of Service | Office, ASC, Hospital outpatient | Office, ASC, Hospital outpatient |
| Anesthesia | Topical + local infiltration (mild) | Topical only |
| Equipment | Flexible laryngoscope, injection needle, augmentation material | Nd:YAG laser or argon laser, slit lamp |
| Post-Procedure Activity | Voice rest 24-48 hours | Eye rest, avoid rubbing × 1 week |
| Complication Risk | Over-injection, material migration, airway issues (rare) | Hyphema, corneal abrasion, pressure spike, iridotomy clotting |
| Material Cost | Included in global fee (collagen, hyaluronic acid, etc.) | Included in global fee (laser consumables minimal) |
| Bilateral Same Day | Possible but verify payer (usually separate sessions preferred) | Possible with -50 modifier; verify payer |
| Repeat Treatment Timing | Usually 3-6 months for temporary material; 6-12 months for semi-permanent | Typically once per eye per lifetime; re-treatment rare unless clotting |
| E/M Bundling | Can bill same-day E/M with -25 if separately identifiable | Can bill same-day E/M with -25 if separately identifiable |
DOCUMENTATION REQUIREMENTS
Common Red Flags for Auditors
CPT 31574 Red Flags:
- ❌ No documentation of which vocal cord injected (left vs right)
- ❌ No pre-procedure laryngoscopy findings documented
- ❌ Unilateral injection billed as bilateral (or vice versa)
- ❌ No indication stated (why does this patient need injection?)
- ❌ Material type/volume not documented
- ❌ No mention of glottal closure assessment post-injection
- ❌ Copy-paste documentation
- ❌ Billing without flexible laryngoscopy documentation
CPT 66761 Red Flags:
- ❌ No pre-procedure gonioscopy findings documented
- ❌ No angle grade (Schaffer or Spaeth) documented
- ❌ No IOP documented pre- or post-procedure
- ❌ No clear indication for iridotomy (why angle-closure?)
- ❌ Bilateral coded incorrectly (two separate codes instead of -50)
- ❌ No mention of iridotomy patency post-procedure
- ❌ Copy-paste notes
- ❌ Diagnosis code doesn’t match clinical findings (coding audit red flag)
Audit Defense Checklist
CPT 31574 Checklist:
- Indication documented - Why was vocal cord injection medically necessary?
- Pre-procedure laryngoscopy - What vocal cord pathology was visualized?
- Unilateral vs bilateral - Which vocal cord(s) treated?
- Material documented - What type? What volume?
- Approach documented - percutaneous vs transoral?
- Glottal closure assessment - Pre- and post-injection documented?
- Complications noted - None or specifically documented?
- Voice rest instructions - Post-operative instructions documented?
- Appropriate RVU - Not overcoding as complex procedure?
- Diagnosis code matches documentation - ICD-10 aligned?
CPT 66761 Checklist:
- Indication documented - Why was iridotomy medically necessary?
- Pre-procedure gonioscopy - Angle grades documented?
- IOP documented - Pre-operative IOP at least?
- Laser type/settings - Nd:YAG or argon? Power/energy?
- Eye treated - OD, OS, or OU?
- Iridotomy patency - Confirmed patent opening?
- Bilateral documentation - If bilateral, documented why both eyes?
- Post-operative assessment - AC reaction, hyphema, IOP documented?
- Complications noted - None or specific issues?
- Diagnosis code matches - Glaucoma code (H40.xx) aligned with gonioscopy findings?
Billing Tips & Compliance
CPT 31574 Best Practices:
- Document specifically which vocal cord - “Left vocal cord” not just “vocal cord”
- Pre-procedure laryngoscopy essential - No injection without documented visualization
- Material important - Document type, volume, and whether temporary or semi-permanent
- Glottal closure assessment - Show that injection improved vocal cord contact
- Voice rest instructions clear - Document post-operative restrictions
- Don’t overcode - This is a minor procedure (10-day global); doesn’t justify complex coding
- Modifiers correct - Use -50 for bilateral only if both vocal cords injected; use -25 for separate E/M
- Diagnosis code accuracy - Match diagnosis to clinical findings (paralysis, atrophy, scarring, voice disorder)
CPT 66761 Best Practices:
- Gonioscopy CRITICAL - Must document pre-procedure angle assessment (Schaffer or Spaeth grade)
- IOP documentation - Pre-op IOP essential, especially in acute angle closure
- Laser specifics - Document laser type and whether Nd:YAG or argon
- Iridotomy patency - Confirm opening created and patent (aqueous flow demonstrated)
- Bilateral documentation - If bilateral, explain why both eyes treated; if one eye, justify deferral of fellow eye
- Diagnosis code specificity - Use specific angle-closure glaucoma code (H40.20x0-H40.239) not generic glaucoma code
- Modifiers correct - Use -50 for bilateral; -25 for same-day E/M if acute angle closure assessment
- Post-op drops - Document anti-inflammatory and lubricating drop regimen given
FAQ
CPT 31574 FAQs:
Q: Can I bill 31574 for both vocal cords on the same day?
A: The code describes unilateral injection. If both vocal cords injected same day, verify payer policy. Some allow bilateral (-50), others require separate dates. Document which side(s) treated.
Q: What if the patient had prior voice therapy and it didn’t work?
A: Document prior therapy in history; justifies escalation to injection. Some payers require therapy trial first; verify LCD.
Q: How long does the material last?
A: Depends on material type (temporary = weeks to months; semi-permanent = 6-12 months; permanent = years). Document in chart.
Q: Can I bill the injection material separately?
A: No. Material cost is included in the global fee. Exception: Autologous fat harvesting may be separately billable if documented as distinct procedure.
Q: What diagnosis code should I use?
A: Use ICD-10 code for the underlying condition (e.g., J38.0 for paralysis, R49 for voice change, R06.02 for dysphonia).
CPT 66761 FAQs:
Q: What’s the difference between 66761 and 65855 (trabeculoplasty)?
A: 66761 creates a hole in the iris (iridotomy) to relieve pupillary block in angle-closure glaucoma. 65855 treats the trabecular meshwork (trabeculoplasty) to improve aqueous outflow in open-angle glaucoma.
Q: Can I bill 66761 and 65855 on the same day?
A: Yes, if medically justified (e.g., patient with both angle-closure and open-angle pathology). Use -59 modifier on one to indicate distinct procedural service. Verify payer policy.
Q: If iridotomy clogs, can I re-treat?
A: Yes, but typically within 90 days is considered re-treatment (modifier -76 or bundled). Verify payer. If beyond 90 days, may be billed as separate procedure.
Q: Can I bill bilateral iridotomies (both eyes) as two separate codes?
A: No. 66761 is “per session,” so bilateral same day = one code 66761 with -50 modifier (or verify payer preference).
Q: What if I can’t complete iridotomy due to corneal haze?
A: Document attempt and reason for incompletion. Use modifier -52 (reduced services) or -53 (discontinued). Some payers may reduce payment or require re-scheduling.
Q: What diagnosis code should I use?
A: Use ICD-10 code for angle-closure glaucoma (H40.20x0-H40.239) or narrow angles (H40.06x9). Verify gonioscopy findings match diagnosis.
Real-World Billing Scenarios
Scenario 1: CPT 31574 - Unilateral Vocal Cord Injection (Office)
Patient: 52-year-old with left vocal cord paralysis from thyroid surgery
Clinical Assessment:
- Flexible laryngoscopy shows left vocal cord in paramedian position (immobile)
- Right vocal cord normal and mobile
- Significant glottal gap during phonation
- Voice: Breathy and weak
Procedure:
- Local anesthesia (1% lidocaine infiltration)
- Flexible laryngoscopy guidance
- Percutaneous injection of 0.5 mL Cymetra collagen into left vocal cord
- Post-injection: Glottal gap reduced significantly; vocal cords more closely opposed
Coding:
- 31574 (laryngeal injection for augmentation, left vocal cord)
- ICD-10: J38.02 (paralysis of vocal cord and larynx, left)
- Modifier: -LT (left side)
- Medicare Payment (Office, GPCI 1.0): ~$41
- CPT 99213-25 if E/M visit also billed for paralysis assessment
Scenario 2: CPT 66761 - Bilateral Laser Iridotomy (Emergency)
Patient: 68-year-old with acute angle-closure glaucoma, right eye
Clinical Assessment:
- Right eye: Shallow anterior chamber, IOP 48 mmHg, pain, redness
- Gonioscopy: Right angle Schaffer grade 0 (completely closed); left angle grade 1-2 (narrow, at risk)
- Diagnosis: Acute angle closure, right eye; narrow angles, left eye (prophylactic)
Pre-procedure Treatment:
- Eye drops (pilocarpine, timolol, brimonidine) given
- IV mannitol 500 mL given for IOP reduction
- IOP partially reduced to 38 mmHg
Procedure:
- Nd:YAG laser iridotomy, right eye: Peripheral iris iridotomy created; opening patent; aqueous flow confirmed
- Post-op IOP right eye: 22 mmHg (significant improvement)
- Nd:YAG laser iridotomy, left eye (prophylactic): Single opening created; patent
- Post-op IOP left eye: 15 mmHg (normal)
Coding:
- 66761-50 (bilateral laser iridotomy, per session)
- ICD-10: H40.211 (Primary angle-closure glaucoma without glaucoma damage, right eye); H40.059 (Narrow angles, unspecified eye)
- Medicare Payment (Emergency, GPCI 1.0): ~$34 (may be doubled for bilateral, depending on payer)
- CPT 99285 (Emergency E/M, high complexity for acute angle closure) billed with -25 modifier if medically necessary separate from laser
Summary & Key Takeaways
CPT 31574 (Laryngeal Injection)
- Code type: Minimally invasive laryngeal procedure
- RVU: 0.75 work; 1.26 total (non-facility)
- Medicare payment: ~$41 (non-facility)
- Global period: 10 days
- Key documentation: Pre-procedure laryngoscopy, injection location (L vs R), material type/volume, glottal closure assessment
- Common modifiers: -LT/-RT (unilateral), -50 (bilateral if applicable), -25 (same-day E/M)
- Audit risk: Moderate (ensure unilateral vs bilateral clearly documented; indication stated)
CPT 66761 (Laser Iridotomy)
- Code type: Minimally invasive laser eye surgery
- RVU: 0.65 work; 1.05 total (non-facility)
- Medicare payment: ~$34 (non-facility)
- Global period: 10 days
- Key documentation: Pre-procedure gonioscopy with angle grades, pre/post-op IOP, laser type/settings, iridotomy patency
- Common modifiers: -RT/-LT (unilateral), -50 (bilateral), -25 (same-day E/M for acute angle closure)
- Audit risk: Moderate (ensure gonioscopy documented; IOP documented; diagnosis matches angle-closure pathology)
Document Created: February 2026
Compliant with: 2025 Medicare Physician Fee Schedule, CMS National and Local Coverage Determinations
Last Updated: February 2026