Crystal's MCW Coder Hub🏥CPT 31526 — Laryngoscopy, Direct, with or without Tracheoscopy; Diagnostic, with Operating Microscope or Telescope
Official Full Descriptor
Laryngoscopy, direct, with or without tracheoscopy; diagnostic, with operating microscope or telescope
This is a purely diagnostic procedure. No therapeutic intervention (biopsy, excision, injection, foreign body removal, or dilation) is performed. The defining features are: (1) direct visualization via rigid laryngoscope, (2) enhancement with an operating microscope or rigid telescope, and (3) the intent is diagnostic only. If any operative/therapeutic maneuver is performed, a different code from the direct laryngoscopy family must be selected.
Code Classification & Position in the CPT Hierarchy
Respiratory System (10000-32999)
└── Larynx (31500-31599)
└── Endoscopy — Laryngoscopy (31505-31579)
└── Direct Laryngoscopy with or without Tracheoscopy (31515-31529)
├── 31515 Direct laryngoscopy, for aspiration
├── 31520 Direct laryngoscopy, diagnostic, newborn
├── 31525 Direct laryngoscopy, diagnostic, except newborn (no microscope)
├── 31526 Direct laryngoscopy, diagnostic, WITH operating microscope or telescope ← TARGET
├── 31527 Direct laryngoscopy, with insertion of obturator
├── 31528 Direct laryngoscopy, with dilation, initial
└── 31529 Direct laryngoscopy, with dilation, subsequent
Full Direct Laryngoscopy Code Family — Comprehensive Reference
This table covers the entire direct laryngoscopy with microscope/telescope subset (microlaryngoscopy codes) and their non-microscope equivalents for quick side-by-side comparison:
Diagnostic / Non-Operative Direct Laryngoscopy
| CPT | Description | Microscope/Telescope | wRVU (approx.) |
|---|---|---|---|
| 31520 | Laryngoscopy direct, diagnostic, newborn | No | ~2.50 |
| 31525 | Laryngoscopy direct, diagnostic, except newborn | No | ~2.56 |
| 31526 | Laryngoscopy direct, diagnostic, WITH operating microscope or telescope | Yes | ~3.50 |
Foreign Body Removal
| CPT | Description | Microscope/Telescope | wRVU (approx.) |
|---|---|---|---|
| 31530 | Laryngoscopy direct, operative, foreign body removal | No | ~5.35 |
| 31531 | Laryngoscopy direct, operative, foreign body removal; with operating microscope or telescope | Yes | ~5.98 |
Biopsy
| CPT | Description | Microscope/Telescope | wRVU (approx.) |
|---|---|---|---|
| 31535 | Laryngoscopy direct, operative, with biopsy | No | ~3.67 |
| 31536 | Laryngoscopy direct, operative, with biopsy; with operating microscope or telescope | Yes | ~4.50 |
Excision of Tumor / Stripping of Vocal Cords or Epiglottis
| CPT | Description | Microscope/Telescope | wRVU (approx.) |
|---|---|---|---|
| 31540 | Laryngoscopy direct, operative, excision of tumor and/or stripping of vocal cords or epiglottis | No | ~5.50 |
| 31541 | Laryngoscopy direct, operative, excision of tumor and/or stripping; with operating microscope or telescope | Yes | ~7.34 |
Submucosal Removal — Non-Neoplastic Lesions (Microscope/Telescope Only)
| CPT | Description | wRVU (approx.) |
|---|---|---|
| 31545 | Laryngoscopy direct, operative, with operating microscope or telescope, submucosal removal of non-neoplastic lesion(s) of vocal cord; reconstruction with local tissue flap(s) | ~10.50 |
| 31546 | Laryngoscopy direct, operative, with operating microscope or telescope, submucosal removal of non-neoplastic lesion(s) of vocal cord; reconstruction with graft(s) (includes obtaining autograft) | ~13.00 |
Arytenoidectomy
| CPT | Description | Microscope/Telescope | wRVU (approx.) |
|---|---|---|---|
| 31560 | Laryngoscopy direct, operative, with arytenoidectomy | No | ~7.50 |
| 31561 | Laryngoscopy direct, operative, with arytenoidectomy; with operating microscope or telescope | Yes | ~10.21 |
Vocal Cord Injection — Therapeutic
| CPT | Description | Microscope/Telescope | wRVU (approx.) |
|---|---|---|---|
| 31570 | Laryngoscopy direct, with injection into vocal cord(s), therapeutic | No | ~3.80 |
| 31571 | Laryngoscopy direct, with injection into vocal cord(s), therapeutic; with operating microscope or telescope | Yes | ~4.82 |
Other Direct Laryngoscopy (No Microscope Equivalent)
| CPT | Description | wRVU (approx.) |
|---|---|---|
| 31515 | Laryngoscopy direct, for aspiration | ~2.20 |
| 31527 | Laryngoscopy direct, with insertion of obturator | ~3.00 |
| 31528 | Laryngoscopy direct, with dilation, initial | ~3.10 |
| 31529 | Laryngoscopy direct, with dilation, subsequent | ~2.50 |
| 31599 | Unlisted procedure, larynx | — |
Important Coding Note:
Microlaryngoscopy codes (those with operating microscope or telescope) pay slightly more than their non-microscope equivalents due to the increased complexity, technical skill, and time required. The documentation must specifically state that an operating microscope or rigid telescope was used — a flexible scope does not qualify for these codes.
Procedure Description — What CPT 31526 Represents
Clinical Definition
CPT 31526 describes a diagnostic direct laryngoscopy performed under general anesthesia using an operating microscope or rigid telescope for magnified, high-resolution visualization of the larynx and, optionally, the trachea (tracheoscopy). This technique is commonly referred to as microlaryngoscopy or suspension microlaryngoscopy when a suspension laryngoscope holder is employed to free the surgeon’s hands for bimanual work or microscope manipulation.
This code is purely diagnostic — the scope is used to examine laryngeal structures and document findings, with no therapeutic maneuver performed. The moment any operative intervention occurs (biopsy, excision, injection, foreign body removal), the code must be escalated to the appropriate operative microlaryngoscopy code.
Setting & Anesthesia
Direct laryngoscopy is almost exclusively performed in the operating room (OR) under general endotracheal anesthesia or jet ventilation. The rigidity of the direct laryngoscope and the requirement for perfect stillness during microscopic examination make awake performance impractical in most cases. Total intravenous anesthesia (TIVA) is frequently preferred to avoid vocal cord motion from inhalational agents and to minimize airway management interference during the examination.
Pediatric cases may also require careful anesthetic planning to balance visualization with airway management, particularly in the presence of subglottic stenosis or mass lesions.
The Distinction Between Microscope and Telescope
The “or telescope” language was added to the CPT descriptors for codes 31526, 31531, 31536, 31541, 31561, and 31571 to reflect evolving technology. Both modalities are included in the same code:
Operating Microscope: A large, floor-mounted or ceiling-mounted binocular microscope suspended over the patient that provides highly magnified (typically 6x-40x), stereoscopic visualization of the larynx. Requires the surgeon to work at a fixed focal length. Provides excellent illumination and depth perception for delicate subepithelial dissection.
Rigid Telescope (Hopkins Rod Telescope): A rigid rod-lens telescope (0° or angled) passed through the laryngoscope lumen that connects to a camera system and monitor for enhanced video-assisted visualization. More portable than the operating microscope; increasingly used as an alternative or complement. Provides excellent image quality and allows video recording for documentation and teaching.
Both modalities serve the same purpose — enhanced visualization beyond what direct naked-eye inspection through the laryngoscope provides — and therefore share the same CPT code.
Tracheoscopy Component
The phrase “with or without tracheoscopy” indicates that inspection of the trachea through the same laryngoscopic session is optional and does not change the code. Tracheoscopy in this context means advancing the scope or a telescope through the subglottis and into the trachea to inspect the tracheal lumen. This is included in the 31526 code and is not separately billable.
Typical Procedural Steps
- Patient is positioned supine with the neck extended (classic “sniffing position” for laryngoscopy). Tooth protection is applied to the upper dentition.
- General anesthesia is induced; airway is secured (typically via small-diameter endotracheal tube, jet ventilation catheter, or maintained with spontaneous ventilation for specific diagnostic purposes such as vocal cord mobility assessment).
- The direct rigid laryngoscope (anterior commissure scope, Dedo, Benjamin-Lindholm, or other suspension laryngoscope) is inserted transorally and advanced to the laryngeal inlet.
- The laryngoscope is suspended using a chest support / suspension apparatus, freeing the surgeon’s hands.
- The operating microscope is brought into position, or the rigid telescope is inserted through the laryngoscope lumen.
- Systematic inspection of the laryngeal structures is performed: epiglottis (laryngeal surface), aryepiglottic folds, arytenoids, false vocal folds (ventricular bands), laryngeal ventricles, true vocal folds (mucosa, vibratory margin, anterior and posterior commissures), subglottis, and trachea if indicated.
- Photodocumentation via camera attached to the telescope or microscope is performed.
- Findings are recorded; no biopsy or other intervention is performed (for 31526 to apply).
- Instruments are removed; patient is awakened and extubated.
Includes
The following components and services are bundled into 31526 and cannot be separately billed:
- The operating microscope use (bundled — do NOT separately report +69990)
- Telescope use for visualization (bundled per the code descriptor)
- Tracheoscopy (when performed as part of the same session — explicitly included in descriptor)
- General anesthesia management by the surgeon (though an anesthesiologist bills separately via 00320/00326 for their services)
- Photodocumentation / video recording of laryngeal findings
- Post-procedure monitoring and discharge instructions (within the 0-day global period)
- Laryngoscopy, indirect, and flexible laryngoscopy performed immediately prior as part of the same diagnostic session to guide the direct scope (cannot be separately billed when performed as preparatory examination on the same date)
Critical Note on +69990 (Operating Microscope Add-on Code)
+69990 must NOT be reported with CPT 31526. The use of the operating microscope is explicitly stated as integral to the procedure in the code descriptor itself. NCCI (National Correct Coding Initiative) edits bundle +69990 with 31526 with a modifier indicator of “0”, meaning this edit cannot be overridden with any modifier. Reporting +69990 alongside 31526 is a compliance violation that will result in claim rejection or audit findings. This is a common error in ENT coding.
Excludes / Cannot Report Together
Mutually Exclusive — Do Not Report with 31526 on the Same Date
| Code | Description | Reason |
|---|---|---|
| 31525 | Direct laryngoscopy, diagnostic, except newborn (no microscope) | Mutually exclusive — cannot bill both diagnostic approaches; 31526 is more specific and has higher value when microscope/telescope is used |
| 31520 | Direct laryngoscopy, diagnostic, newborn | Mutually exclusive — use appropriate age-specific code |
| +69990 | Operating microscope add-on | Bundled into 31526 — NCCI edit with modifier indicator 0 (cannot override) |
| 31535 | Direct laryngoscopy with biopsy (no microscope) | Cannot bill diagnostic code and operative biopsy code together; if biopsy is performed, escalate to 31536 |
| 31536 | Direct laryngoscopy with biopsy, with microscope | If biopsy is performed, 31536 replaces 31526 entirely — you cannot bill both |
| 31540 | Direct laryngoscopy, excision tumor (no microscope) | Cannot bill diagnostic with operative excision |
| 31541 | Direct laryngoscopy, excision tumor, with microscope | If excision is performed, 31541 replaces 31526 |
| 31571 | Laryngoscopy direct, vocal cord injection, with microscope | If injection is performed, 31571 replaces 31526 |
| 31500 | Emergency endotracheal intubation | Laryngoscopy is not separately reportable when performed solely to facilitate intubation |
Important NCCI Bundling Principles
- If the surgeon begins with a diagnostic microlaryngoscopy (31526) and then proceeds to perform a therapeutic maneuver in the same session (biopsy, excision, injection), only the operative code (31536, 31541, 31571, etc.) is reported — 31526 is dropped entirely because the diagnostic examination is integral to the operative procedure.
- A flexible laryngoscopy (31575) performed on the same date in the office does not necessarily preclude reporting 31526 if the direct OR-based procedure is clearly distinct and medically necessary; however, this scenario is uncommon and requires careful documentation and payer verification.
- Indirect laryngoscopy (31505) performed in the office on the same day as OR-based 31526 may be separately reportable with modifier 25 on the E&M or modifier 59/XE on the indirect laryngoscopy, but payer policies vary — review MAC LCDs.
HCC (Hierarchical Condition Category)
| Field | Detail |
|---|---|
| HCC Mapped | No |
| Rationale | CPT 31526 is a procedure code, not a diagnosis code. HCC risk adjustment is driven exclusively by ICD-10-CM diagnosis codes. The procedure itself carries no HCC weight. |
| HCC Opportunity | The diagnosis codes reported with 31526 may carry HCC significance. For example, if the laryngoscopy is performed for evaluation of a laryngeal malignancy, the associated neoplasm code (C32.0-C32.9) carries HCC weight. Hoarseness (R49.0), laryngeal stenosis (J38.6), or benign lesions (D14.1) do not typically carry HCC weight but should still be coded accurately to support medical necessity. |
| Risk-Relevant Diagnoses Commonly Paired | C32.x (Malignant neoplasm of larynx) — HCC; D02.0 (CIS of glottis) — HCC-adjacent; J95.5 (Post-procedural subglottic stenosis) — may affect quality metrics |
wRVU (Work Relative Value Units)
CPT 31526 carries the following approximate RVU values based on the CMS Medicare Physician Fee Schedule:
| Component | Facility Setting | Non-Facility Setting |
|---|---|---|
| Work RVU (wRVU) | ~3.50 | ~3.50 |
| Practice Expense RVU | ~1.02 | ~3.10 (higher — physician bears equipment/staff cost) |
| Malpractice RVU | ~0.23 | ~0.23 |
| Total RVU (facility) | ~4.75 | ~6.83 (non-facility) |
Important: 31526 is almost exclusively performed in a facility setting (hospital OR or ASC), so the facility-side total RVU and associated payment rate governs in practice. The non-facility RVU is listed for completeness but is rarely clinically applicable.
Approximate Medicare National Payment (Facility, 2025):
- Total RVU (~4.75) × Conversion Factor (154 - $160** (varies by GPCI locality)
Comparison to Related Codes:
| CPT | Description | wRVU (approx.) |
|---|---|---|
| 31525 | Diagnostic direct laryngoscopy, no microscope | ~2.56 |
| 31526 | Diagnostic direct laryngoscopy, WITH microscope/telescope | ~3.50 |
| 31535 | Direct laryngoscopy with biopsy | ~3.67 |
| 31536 | Direct laryngoscopy with biopsy, with microscope | ~4.50 |
| 31541 | Direct laryngoscopy, excision tumor, with microscope | ~7.34 |
| 31571 | Direct laryngoscopy, vocal cord injection, with microscope | ~4.82 |
| 31561 | Direct laryngoscopy, arytenoidectomy, with microscope | ~10.21 |
Always verify current wRVU values against the CMS MPFS Addendum B for the applicable fiscal year. Values listed above are approximate and based on CY2024-2025 data.
Assistant Payable
| Field | Detail |
|---|---|
| Medicare Assistant-at-Surgery | No — Not Payable |
| Medicare Bilateral Indicator | Not applicable (Modifier 50 not appropriate for laryngoscopy) |
| Co-surgeon | Not applicable — 31526 is a single-surgeon diagnostic procedure |
| Rationale | CPT 31526 is a diagnostic endoscopic procedure performed by a single surgeon. An assistant surgeon has no defined role in the diagnostic examination of the larynx through a rigid scope. Medicare’s assistant-at-surgery indicator for 31526 is 0 (assistant not payable under any circumstance). This applies regardless of setting, complexity, or patient status. |
| Commercial/Medicaid | Some commercial payers may have different assistant policies, but in practice, no payer reimburses for an assistant during a diagnostic direct laryngoscopy. |
| Note on Anesthesia | The anesthesiologist bills separately (CPT 00320 or 00326) and is not an “assistant.” This is a separate professional service, not an assistant-at-surgery service. |
Global Period & Modifier Considerations
| Field | Detail |
|---|---|
| Global Period | 0 days |
| Implication | All direct laryngoscopy CPT codes carry a 0-day global period. This means pre- and post-operative care are not bundled into the procedure payment. A separately documented and medically necessary E&M service on the same day as the laryngoscopy may be separately billed. |
| Modifier -25 | Required when billing an E&M on the same date as 31526 for Medicare and many commercial payers; the E&M must be separately documented and medically necessary beyond the decision to perform the procedure |
| Modifier -57 | Some commercial payers (not Medicare) may request modifier -57 (decision for surgery) on the E&M rather than -25 when the decision to perform the laryngoscopy is made at that visit; verify by payer |
| Modifier -22 | Use when the procedure requires substantially greater work than typically required (e.g., severely scarred supraglottis, difficult anatomy, extended examination time); documentation must explicitly support the additional work |
| Modifier -52 | Use when the service is reduced (e.g., examination was limited due to patient intolerance or anatomical barrier and was not completed as planned) |
| Modifier -59 / -XE | Use to unbundle a separate and distinct endoscopic procedure performed at a different anatomical site or encounter on the same date when NCCI edits would otherwise bundle it |
| Modifier -LT / -RT | Laterality modifiers are not typically applicable to laryngoscopy codes, as the larynx is a midline structure; however, some payers require site specification when documenting unilateral vocal cord findings |
Site of Service (SOS) Considerations
| Setting | Applicable | Notes |
|---|---|---|
| Operating Room — Hospital Inpatient | Yes — most common for complex patients | Patient admitted for associated condition; 31526 billed as part of inpatient encounter |
| Operating Room — Hospital Outpatient (HOPD) | Yes — very common | Facility bills APC; physician bills professional component; typical for standard diagnostic microlaryngoscopy |
| Ambulatory Surgery Center (ASC) | Yes — appropriate setting | 31526 is on the Medicare ASC covered procedure list; verify ASC payment rate separately |
| Office / Clinic | No — not appropriate | 31526 requires general anesthesia and OR setup; cannot be performed in an office setting; flexible laryngoscopy (31575) is the office-based equivalent |
| Bedside / ICU | No | Not appropriate for this procedure |
Payment Differential: When 31526 is performed in a hospital outpatient/HOPD setting, CMS pays the physician the facility rate (lower PE RVUs) and pays the hospital separately under the OPPS APC system. When performed in an ASC, the physician is paid at the facility rate and the ASC receives a separate facility payment. The non-facility rate applies only if somehow performed in an office setting, which is not clinically feasible for this procedure.
MS-DRG Assignment
CPT 31526 is a procedure code — MS-DRGs are assigned based on the combination of the procedure code(s) and the principal ICD-10-CM diagnosis. The following DRGs are most commonly associated with inpatient encounters where 31526 is the principal or a significant secondary procedure:
Respiratory / Laryngeal DRGs
| MS-DRG | Title | MCC/CC |
|---|---|---|
| 129 | Major Respiratory Infections and Inflammations with MCC | With MCC |
| 130 | Major Respiratory Infections and Inflammations with CC | With CC |
| 131 | Major Respiratory Infections and Inflammations without CC/MCC | Without |
| 134 | Pulmonary Edema and Respiratory Failure | Varies |
| 163 | Major Chest Procedures with MCC | Surgical — if 31526 combined with tracheostomy |
| 168 | Major Respiratory System Diagnoses with Ventilator Support 96+ Hrs | Complex |
Ear, Nose, and Throat (ENT) DRGs
| MS-DRG | Title | MCC/CC |
|---|---|---|
| 153 | Otitis Media and URI with MCC | With MCC |
| 154 | Otitis Media and URI without MCC | Without MCC |
| 185 | Dental and Oral Diseases with MCC | — |
| 186 | Dental and Oral Diseases without MCC | — |
| 395 | Red Blood Cell Disorders with MCC | — (if hematologic cause) |
Tracheostomy DRGs (when 31526 accompanies tracheostomy)
| MS-DRG | Title |
|---|---|
| 003 | ECMO or Tracheostomy with MV 96+ Hrs or Principal Diagnosis Except Face, Mouth, Neck with MCC |
| 004 | Tracheostomy with MV 96+ Hrs or Principal Diagnosis Except Face, Mouth, Neck |
| 011 | Tracheostomy for Face, Mouth, and Neck Diagnoses with MCC |
| 012 | Tracheostomy for Face, Mouth, and Neck Diagnoses with CC |
| 013 | Tracheostomy for Face, Mouth, and Neck Diagnoses without CC/MCC |
Inpatient Coding Context: 31526 alone rarely drives a high-weighted DRG because it is diagnostic. The principal ICD-10-CM diagnosis and any additional procedures (e.g., if a tracheostomy is also performed for airway management) will govern DRG assignment and relative weight far more than the diagnostic laryngoscopy itself.
Commonly Paired ICD-10-CM Diagnosis Codes
The following diagnosis codes frequently support medical necessity for CPT 31526. Always code to the highest degree of specificity based on documentation:
Laryngeal Neoplasms
| ICD-10-CM | Description |
|---|---|
| C32.0 | Malignant neoplasm of glottis |
| C32.1 | Malignant neoplasm of supraglottis |
| C32.2 | Malignant neoplasm of subglottis |
| C32.3 | Malignant neoplasm of laryngeal cartilage |
| C32.8 | Overlapping lesion of larynx |
| C32.9 | Malignant neoplasm of larynx, unspecified |
| D02.0 | Carcinoma in situ of larynx |
| D14.1 | Benign neoplasm of larynx |
Vocal Cord / Laryngeal Disorders
| ICD-10-CM | Description |
|---|---|
| J38.00 | Paralysis of vocal cords and larynx, unspecified |
| J38.01 | Paralysis of vocal cords and larynx, unilateral |
| J38.02 | Paralysis of vocal cords and larynx, bilateral |
| J38.1 | Polyp of vocal cord and larynx |
| J38.2 | Nodules of vocal cords |
| J38.3 | Other diseases of vocal cords (includes leukoplakia) |
| J38.4 | Edema of larynx |
| J38.5 | Laryngeal spasm |
| J38.6 | Stenosis of larynx |
| J38.7 | Other diseases of larynx |
Symptoms Driving Diagnostic Evaluation
| ICD-10-CM | Description |
|---|---|
| R49.0 | Dysphonia / hoarseness |
| R49.1 | Aphonia |
| R49.21 | Hypernasality |
| R49.22 | Hyponasality |
| R05.9 | Cough, unspecified |
| R06.2 | Wheezing |
| R06.00 | Dyspnea, unspecified |
| R06.1 | Stridor |
| R13.10 | Dysphagia, unspecified |
| R13.12 | Dysphagia, oropharyngeal phase |
Post-Procedural / Post-Intubation
| ICD-10-CM | Description |
|---|---|
| J95.5 | Post-procedural subglottic stenosis |
| T17.308A | Foreign body in larynx, unspecified |
| J68.0 | Bronchitis and pneumonitis due to solids and liquids |
| J39.2 | Other diseases of pharynx (post-radiation changes) |
Trauma / Foreign Body
| ICD-10-CM | Description |
|---|---|
| S11.011A | Laceration without foreign body of larynx, initial encounter |
| T17.300A | Foreign body in larynx, causing asphyxiation |
| T17.308A | Foreign body in larynx, other foreign body |
| S19.81XA | Other specified injuries of larynx, initial encounter |
Present on Admission (POA)
CPT 31526 is a procedure code — POA is not assigned to procedure codes. POA indicators apply to ICD-10-CM diagnosis codes reported on the inpatient claim. The primary diagnosis (e.g., laryngeal mass, subglottic stenosis, vocal cord paralysis) driving the laryngoscopy will require appropriate POA assignment (Y/N/U/W/1) based on whether the condition was present at time of inpatient admission.
Coding Guidelines & Common Errors
Rule 1 — Diagnostic vs. Operative: Most Important Distinction
The single most common and impactful error in microlaryngoscopy coding is billing 31526 when a biopsy or other operative intervention was actually performed. The operative note must be read in its entirety:
- If only examination occurred → 31526
- If biopsy was taken → 31536 (with microscope) or 31535 (without)
- If lesion was excised or vocal cord stripped → 31541 (with microscope) or 31540 (without)
- If vocal cord injection was performed → 31571 (with microscope) or 31570 (without)
- If foreign body was removed → 31531 (with microscope) or 31530 (without)
Rule 2 — Do Not Add +69990
Never report +69990 with 31526. The microscope is already factored into the code value and descriptor. This is a hard NCCI edit with no modifier bypass. This is one of the most frequently cited compliance errors in ENT coding.
Rule 3 — Microscope/Telescope Must Be Documented
The operative report must explicitly document the use of the operating microscope or a rigid telescope. Language such as “direct laryngoscopy was performed” without mention of the microscope or telescope should default to 31525, not 31526. Do not assign 31526 based on assumption.
Rule 4 — “Suspension” Does Not Automatically Mean Microscope
The term “suspension laryngoscopy” refers to the use of a laryngoscope suspension apparatus (chest support) to stabilize the scope and free the surgeon’s hands. This is a positioning technique, not a visualization modality. Suspension laryngoscopy may be performed with or without the operating microscope. Confirm that the operative report documents both suspension AND use of microscope/telescope to support 31526.
Rule 5 — Converted Procedures
If the procedure was intended to be diagnostic (31526) but findings at the time of examination required a therapeutic intervention (biopsy, excision), only the operative code is reported. 31526 is dropped. The diagnostic examination is integral to the operative procedure.
Rule 6 — Same-Day Flexible Laryngoscopy
If a flexible laryngoscopy (31575) is performed in the office earlier the same day and a diagnostic direct microlaryngoscopy (31526) is subsequently performed in the OR, both may potentially be billed if they are distinct procedures with separate medical necessity. However, many payers will bundle the office-based flexible scope. Document medical necessity for proceeding to OR-based direct scope clearly, and verify MAC LCD/payer policy.
Rule 7 — Bilateral Modifier Not Applicable
Modifier 50 (bilateral procedure) should not be applied to 31526. The larynx is a single midline structure; the procedure does not have a bilateral variant. Medicare’s bilateral surgery indicator for this code does not support modifier 50 billing.
Anesthesia Codes Associated with CPT 31526
Anesthesia for laryngoscopy is billed separately by the anesthesiologist/CRNA using the following anesthesia CPT codes:
| CPT | Description | Base Units (approx.) |
|---|---|---|
| 00320 | Anesthesia for procedures on larynx and trachea in patient 1 year and older | 5 |
| 00326 | Anesthesia for all procedures on the larynx and trachea in patient younger than 1 year | 8 |
Note: Anesthesia base units × time units × conversion factor = anesthesia payment. These codes are entirely separate from 31526 and represent the anesthesiologist’s professional work.
Coding Examples
Example 1 — Standard Diagnostic Microlaryngoscopy for Hoarseness
A 58-year-old male with 3 months of progressive hoarseness and history of cigarette smoking is evaluated. Office flexible laryngoscopy revealed a right vocal fold lesion, nature unclear. He is taken to the OR for direct microlaryngoscopy. Under general anesthesia, a suspension laryngoscope is inserted, suspended, and the operating microscope brought in. Systematic examination reveals an irregular, erythematous lesion at the right true vocal fold vibratory margin. No biopsy is taken at this session due to patient anticoagulation. Findings are documented and photographed. Procedure ends.
CPT: 31526 — Laryngoscopy, direct, diagnostic, with operating microscope ICD-10-CM: R49.0 — Dysphonia (hoarseness) / or D14.1 (benign lesion if that’s the pre-op diagnosis) / or C32.0 if malignancy suspected and documented POA: Y Modifier: None required for this standalone OR case Do NOT add: +69990
Example 2 — Diagnostic Microlaryngoscopy with Tracheoscopy
A 45-year-old woman with stridor and prior history of prolonged intubation is brought to the OR. Suspension direct laryngoscopy is performed with the rigid telescope. The larynx is inspected — findings include mild posterior glottic scarring. The telescope is advanced through the subglottis into the upper trachea (tracheoscopy) — no significant subglottic or tracheal stenosis identified. No intervention is performed.
CPT: 31526 — Tracheoscopy component is included in the code; do not separately bill ICD-10-CM: J38.6 — Stenosis of larynx (evaluated for, found to be mild) / J95.5 — Post-procedural subglottic stenosis (if confirmed) Note: The tracheoscopy does not change the code. 31526 covers “with or without tracheoscopy.”
Example 3 — Diagnostic Scope Converted to Operative Biopsy — Code Selection Changes
A 62-year-old man is brought to the OR for diagnostic microlaryngoscopy to evaluate a suspicious left glottic lesion found on flexible laryngoscopy. Under general anesthesia and operating microscope, the lesion is visualized and appears exophytic with irregular margins. The surgeon decides to biopsy the lesion for pathological diagnosis.
CPT: 31536 — NOT 31526 (The moment a biopsy is performed, the code escalates to 31536. Do not bill 31526 and 31536 together.) ICD-10-CM: D02.0 — CIS of larynx (if that is the pre/post-op diagnosis), or C32.0, or R49.0 if preoperative only Common Error Alert: Billing 31526 and 31536 together for this scenario is an NCCI violation.
Example 4 — Microscope Documented but Not Used for Primary Visualization
An ENT operative report states “direct laryngoscopy performed; operating microscope was brought into the room but was not used; examination was performed under direct vision.” No telescope was used either.
CPT: 31525 — NOT 31526 (The microscope/telescope must actually be used for visualization, not merely brought in. The code descriptor requires use of the operating microscope or telescope. Default to 31525 when only direct naked-eye visualization is performed.)
Example 5 — Pediatric Diagnostic Microlaryngoscopy for Suspected Subglottic Hemangioma
A 6-month-old infant with biphasic stridor is taken to the OR. Suspension microlaryngoscopy is performed by the pediatric ENT surgeon. The operating microscope is used for enhanced visualization. A sessile subglottic lesion is identified and documented. No biopsy or intervention is performed. Findings support subglottic hemangioma.
CPT: 31526 — Diagnostic, with operating microscope (Note: Use 31520 only if diagnostic laryngoscopy without microscope is performed in a newborn/infant. 31526 applies regardless of age when the microscope is used — there is no pediatric-specific code for microlaryngoscopy.) ICD-10-CM: D18.09 — Hemangioma of other sites (or D18.01 skin and subcutaneous tissue; verify correct code for subglottic location per documentation) Anesthesia CPT: 00326 — Anesthesia for larynx/trachea procedures, patient younger than 1 year
Example 6 — E&M on Same Day as 31526 (0-Day Global Applies)
A patient presents to the ENT clinic for an established patient visit regarding new onset hoarseness. After reviewing the history and performing a comprehensive exam, the surgeon decides to take the patient directly to the OR the same day for urgent diagnostic microlaryngoscopy given concern for malignancy. A complete E&M is documented separately in addition to the procedure.
CPT: 99214-25 or 99215-25 — Office E&M with modifier -25 (for Medicare) CPT: 31526 — Diagnostic microlaryngoscopy same day ICD-10-CM: R49.0 — Hoarseness (for both) Rationale: 31526 has a 0-day global period; the E&M is separately reportable with modifier -25 because it represents a separately identified, documented service above and beyond the procedure itself. Commercial payers may require modifier -57 for this scenario — verify per payer.
Example 7 — Inpatient Admission, Direct Microlaryngoscopy as Diagnostic Workup for Airway Emergency
A 71-year-old male is admitted to the hospital with acute stridor and respiratory distress. CT neck/chest suggests laryngeal mass. He is stabilized, intubated, and brought to the OR for diagnostic microlaryngoscopy. The suspension laryngoscope is placed and the operating microscope used. A large glottic/supraglottic mass is identified occupying approximately 70% of the airway lumen. No intervention is performed; biopsy deferred pending staging CT and multidisciplinary discussion. Tracheostomy is then performed at the same session for airway management.
CPT: 31526 — Diagnostic microlaryngoscopy CPT: 31600 — Tracheostomy, planned (or 31601 under 2 years of age) ICD-10-CM (Principal Dx): J38.6 — Stenosis of larynx (or C32.9 — Malignant neoplasm of larynx, unspecified, if that is the confirmed diagnosis at time of discharge) MS-DRG: Will be governed primarily by the tracheostomy and the laryngeal diagnosis; likely MS-DRG 011, 012, or 013 depending on CC/MCC profile
Documentation Requirements for Optimal Coding
To support 31526 and defend it on audit, the operative report must contain:
- Type of laryngoscope — name/model or description of the direct rigid laryngoscope used (e.g., “Dedo laryngoscope,” “anterior commissure scope,” “suspension laryngoscope”)
- Explicit statement of microscope or telescope use — “the operating microscope was brought into position and used for visualization” or “a 0-degree rigid Hopkins rod telescope was used”
- Suspension — documentation that the scope was suspended (if applicable)
- Structures examined — systematic listing of all structures visualized (epiglottis, arytenoids, false cords, true vocal folds, anterior/posterior commissure, subglottis, trachea if examined)
- Findings — specific description of all normal and abnormal findings
- No intervention — explicit statement that no biopsy, injection, excision, or other therapeutic maneuver was performed (to justify diagnostic code over operative code)
- Tracheoscopy — if the trachea was inspected, document this explicitly (does not change code but supports complete documentation)
- Anesthesia type — general endotracheal anesthesia, jet ventilation, or TIVA
- Photos/video — notation of photodocumentation supports thoroughness of examination
Quick Reference Summary
| Field | Detail |
|---|---|
| Code | 31526 |
| Type | CPT Procedure Code |
| Full Descriptor | Laryngoscopy, direct, with or without tracheoscopy; diagnostic, with operating microscope or telescope |
| Setting | Operating Room only (Hospital OR, HOPD, or ASC) |
| Anesthesia | General anesthesia required |
| Global Period | 0 days |
| wRVU | ~3.50 (facility) |
| HCC | No (procedure code; diagnosis codes govern HCC) |
| Assistant Payable | No (Medicare indicator 0) |
| Bilateral (Modifier 50) | Not applicable |
| DO NOT add +69990 | NCCI bundled, modifier indicator 0 — cannot override |
| Key Distinction from 31525 | Microscope or rigid telescope MUST be documented and used |
| Key Distinction from 31536 | 31526 = diagnostic only; any biopsy → escalate to 31536 |
| Key Distinction from 31541 | 31526 = diagnostic only; any excision/stripping → escalate to 31541 |
| Tracheoscopy | Included — do not separately bill |
| Common Errors | Adding +69990; billing 31526 when biopsy was performed; using 31526 when microscope not documented |