31295

🎈 CPT 31295 — Nasal/Sinus Endoscopy, Surgical, with Dilation (e.g., Balloon Dilation); Maxillary Sinus Ostium, Transnasal or Via Canine Fossa

Quick Reference

wRVU: 2.70 | Global Period: 090 (90 days) | Assistant Payable: ❌ No | Bilateral Indicator: 2

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📋 Clinical Description

CPT 31295 describes a surgical nasal/sinus endoscopy during which the physician uses a balloon catheter — and no other cutting instrument — to dilate the natural ostium of the maxillary sinus. The approach may be transnasal (through the nasal cavity under endoscopic visualization) or via the canine fossa (a small trocar access point through the anterior wall of the maxillary sinus, beneath the upper lip). This code is sinus-specific and site-specific: it covers the maxillary ostium only; dilation of the frontal sinus ostium is reported separately with 31296, dilation of the sphenoid ostium with 31297, and combined frontal-plus-sphenoid dilation with 31298.

Chronic maxillary sinusitis (J32.0) is a persistent inflammatory condition of the maxillary sinus mucosa lasting 12 weeks or longer despite medical therapy. Mucosal edema, mucous stasis, and ostial obstruction create a self-perpetuating cycle of infection and inflammation; untreated, the condition may progress to orbital, intracranial, or soft-tissue complications. Balloon sinuplasty breaks this cycle by mechanically expanding the natural ostium, restoring mucociliary drainage without removing tissue, preserving the sinus mucosa, and reducing recovery burden compared to traditional endoscopic antrostomy (31256/31267).

This procedure may be performed in the following clinical contexts:

• Chronic maxillary sinusitis refractory to medical management — Patients with documented ≥12 weeks of symptoms and failure of appropriate antibiotic, nasal steroid, and/or saline irrigation therapy; the most common and payer-validated indication.
• Recurrent acute maxillary sinusitis — Patients with ≥4 acute episodes per year, each episode lasting ≥10 days, with documented radiographic evidence of sinus disease; coverage criteria vary by payer — verify LCD/NCD applicability.
• Ostial stenosis without tissue hypertrophy — When CT imaging demonstrates a narrowed but patent natural ostium with no obstructing polyp, fungal ball, or mucocele requiring tissue removal; balloon dilation is the preferred approach over antrostomy when no tissue removal is needed.
• In-office balloon sinuplasty under local anesthesia — Patients who are poor surgical candidates for general anesthesia; the balloon approach is uniquely suited to office-based delivery with topical/local anesthesia and minimal recovery time.
• Pansinusitis with maxillary predominance — When multiple sinuses are affected but the maxillary component is the primary driver, 31295 is assigned for the maxillary site; additional codes (31296, 31297) are appended for other sinuses dilated in the same session on different sinuses.

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🔬 Anatomical & Procedural Considerations

Approach Variant	Technique Steps	Key Clinical / Coding Notes
Transnasal (Standard)	Endoscope introduced transnasally; guide wire or seeker advanced into natural maxillary ostium via middle meatus under direct visualization; balloon catheter threaded over guide wire and seated across ostium; balloon inflated to 8-12 atm for 5-10 seconds; balloon deflated and removed; ostium assessed for patency	Most common approach; no incision required; preserves mucosa; [[fluoroscopy]] if performed is bundled — do NOT report separately
Canine Fossa Approach	Small trocar placed through canine fossa (anterior maxillary wall, via gingival sulcus incision); endoscope introduced retrograde into maxillary sinus; balloon catheter guided anterograde through natural ostium and dilated from inside out	Used when transnasal access is obstructed by anatomic variants (paradoxical turbinate, deviated uncinate); still reported with 31295 — the parenthetical descriptor “transnasal or via canine fossa” makes both approaches billable under same code
Bilateral Same Session	Each side treated separately in same operative session; balloon catheter repositioned; each ostium dilated independently	Bill two lines with -RT and -LT (preferred by most MACs) or single line with -50; bilateral indicator 2 means different payment methodology applies — verify MAC billing format preference

Clinical Pearl

CPT 31295 strictly requires that a balloon catheter be the only instrument used and that no tissue is removed. If any tissue removal occurs — polypectomy, partial inferior turbinoplasty, antrostomy enlargement — the procedure escalates to 31256 (maxillary antrostomy) or 31267 (with removal of tissue from maxillary sinus), and 31295 becomes bundled and non-separately reportable per the AMA parenthetical note. The operative note must explicitly state “balloon catheter only, no tissue removed” to survive audit.

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✅ Procedure Includes

• Pre-procedure endoscopic nasal examination performed as part of the operative approach
• Topical or local anesthetic administration (no separate anesthesia code expected for office-based procedures)
• Endoscope introduction and navigation to the maxillary ostium under direct visualization
• Guide wire or seeker placement across the maxillary ostium
• Balloon catheter positioning across the ostium
• Balloon inflation, dilation of the ostial lumen, and balloon deflation and removal
• Intraoperative assessment of ostial patency post-dilation
• Saline irrigation of the sinus cavity if performed as part of the procedure
• Fluoroscopy guidance if used (bundled — not separately reportable per AAO-HNS guidance and AMA parenthetical)
• Documentation of approach (transnasal vs. canine fossa), laterality, and confirmation that no tissue was removed

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❌ Excludes / Do Not Report Together

Code	Description	Relationship to 31295
31256	Nasal/sinus endoscopy, surgical, with maxillary antrostomy	Mutually exclusive at same site same session — antrostomy with tissue removal and balloon dilation of the same maxillary ostium cannot both be reported; if tissue is removed, 31256 or 31267 replaces 31295 entirely
31267	Nasal/sinus endoscopy, surgical, with maxillary antrostomy; with removal of tissue from maxillary sinus	Same mutual exclusivity as 31256; the AMA parenthetical note explicitly states do not report 31295 in conjunction with 31256 or 31267 when performed on the same sinus
31233	Nasal/sinus endoscopy, diagnostic; with maxillary sinusoscopy	Diagnostic sinusoscopy is bundled into the surgical dilation — do not report 31233 with 31295 on the same sinus per NCCI and AMA parenthetical
31296	Nasal/sinus endoscopy, surgical, with dilation; frontal sinus ostium	Separately reportable when performed on a DIFFERENT sinus in same session — this is a sibling code for the frontal sinus, not the maxillary; may be billed alongside 31295 with modifier -51 on the lesser-valued code
31297	Nasal/sinus endoscopy, surgical, with dilation; sphenoid sinus ostium	Same as 31296 — separately reportable for the sphenoid sinus when distinct from the maxillary dilation
31298	Nasal/sinus endoscopy, surgical, with dilation; frontal and sphenoid sinus ostia	Separately reportable alongside 31295 when frontal + sphenoid are also dilated in same session (different sinuses)
E/M codes (992xx)	Office visit, any level	Separately reportable only when modifier -25 is appended to the E/M code for a significant, separately identifiable evaluation beyond the routine pre-procedure assessment; modifier -57 required when the E/M on the same day is the decision visit for a 90-day global surgery

Bundling Alert — Global Period is 090, Not 010

CPT 31295 carries a 90-day global period, making it a major surgical procedure under Medicare Global Surgery Rules — not a minor procedure. This is the single most common audit finding for balloon sinuplasty billing. Any E/M service on the same date of service as 31295 requires modifier -57 (decision for major surgery) on the E/M — NOT modifier -25, which applies only to minor procedure (000/010 global) same-day E/M visits. Postoperative follow-up visits related to the sinus dilation within the 90-day window are bundled into the global payment and must not be billed separately. Unrelated E/M services within the global window require modifier -24 and must be explicitly documented as unrelated to the sinusitis or procedure.

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🌳 Code Tree — Surgery: Accessory Sinuses / Nasal Endoscopy

CPT 31231-31298  Surgery: Nose, Accessory Sinuses — Nasal / Sinus Endoscopy
│
├── 31231-31235  Diagnostic Nasal/Sinus Endoscopy
│   ├── 31231  Nasal endoscopy, diagnostic, unilateral or bilateral
│   ├── 31233  With maxillary sinusoscopy
│   └── 31235  With sphenoid sinusoscopy
│
├── 31237-31298  Surgical Nasal/Sinus Endoscopy
│   │
│   ├── 31237  With biopsy, polypectomy or debridement
│   ├── 31238  With control of nasal hemorrhage
│   ├── 31239  With dacryocystorhinostomy
│   ├── 31240  With concha bullosa resection
│   │
│   ├── 31253-31298  Sinus-Specific Surgical Endoscopy
│   │   ├── 31253  Total (complete) bilateral ethmoidectomy with sphenoidotomy and frontal sinus exploration (Global: 090)
│   │   ├── 31254  Partial (anterior) ethmoidectomy (Global: 090)
│   │   ├── 31255  Total (anterior and posterior) ethmoidectomy (Global: 090)
│   │   ├── 31256  Maxillary antrostomy (Global: 090)
│   │   ├── 31257  Total ethmoidectomy with sphenoidotomy (Global: 090)
│   │   ├── 31259  Total ethmoidectomy with sphenoidotomy, frontal sinus exploration, and cell removal (Global: 090)
│   │   ├── 31267  Maxillary antrostomy with tissue removal (Global: 090)
│   │   ├── 31276  Frontal sinus exploration with or without tissue removal (Global: 090)
│   │   ├── 31287  Sphenoidotomy (Global: 090)
│   │   ├── 31288  Sphenoidotomy with tissue removal (Global: 090)
│   │   │
│   │   ├── ▶▶ 31295 ◀◀  Dilation — Maxillary Sinus Ostium (transnasal or via canine fossa)  ← YOU ARE HERE  (Global: 090)
│   │   ├── 31296  Dilation — Frontal Sinus Ostium  (Global: 090)
│   │   ├── 31297  Dilation — Sphenoid Sinus Ostium  (Global: 090)
│   │   └── 31298  Dilation — Frontal and Sphenoid Sinus Ostia  (Global: 090)
│   │
│   └── 31299  Unlisted procedure, accessory sinuses (use for non-balloon dilation with fixed dilators)

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💰 RVU & Reimbursement Profile

Component	Value
Work RVU (wRVU)	2.70 (verify against current CMS MPFS for applicable year; revalued in 2018 and confirmed in subsequent MPFS cycles)
Global Period	090 (90 days)
Bilateral Indicator	2 — bilateral procedures with different payment methodology; Medicare does not apply the standard 150% bilateral rule; each side is paid separately at full rate when billed on separate lines with laterality modifiers; verify MAC-specific billing format
Assistant Surgeon	❌ Not payable
Co-Surgeon	❌ Not applicable
Team Surgery	❌ Not applicable
PC/TC Split	❌ No — procedure code only (Indicator 0)
Modifier -51 Exempt	No
Anesthesia	Topical or local infiltration (office-based); general or MAC anesthesia in ASC/outpatient hospital setting — separately billable under applicable anesthesia CPT when performed in facility setting

Bilateral Billing Rules

CPT 31295 carries a bilateral indicator of 2, which means it does not follow standard 150% bilateral payment reduction rules under Medicare. When balloon dilation is performed on both maxillary sinuses in the same session, the preferred Medicare billing format is two separate line items — one with modifier -RT and one with -LT — each reimbursed at 100% of the fee schedule amount. Some MACs may accept a single line with modifier -50; always verify with the applicable MAC’s billing preference. Do NOT apply a 50% reduction to the second line for bilateral indicator 2 codes — this is a common billing error that triggers underpayment.

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🏷️ Modifier Reference

Modifier	Name	When to Apply
-RT	Right Side	Balloon dilation performed on the right maxillary sinus only
-LT	Left Side	Balloon dilation performed on the left maxillary sinus only
-50	Bilateral Procedure	Both maxillary sinuses dilated same session — alternative to -RT/-LT dual lines; confirm MAC preference
-57	Decision for Major Surgery	Applied to the E/M code (not 31295) when the office visit on the same date is the decision visit for this 90-day global surgery; failure to use -57 (and using -25 instead) is an audit red flag and claim denial trigger
-25	Significant, Separately Identifiable E/M	NOT applicable to a same-day E/M when 31295 is the procedure — 31295 is a 090-day global (major) surgery; use -57 on the E/M instead
-24	Unrelated E/M During Postoperative Period	Applied to E/M when patient returns within the 90-day global window for a condition explicitly unrelated to the sinus dilation; document unrelated nature thoroughly
-51	Multiple Procedures	Apply to the lesser-valued sibling code when 31295 is billed alongside 31296, 31297, or 31298 in the same session (different sinuses)
-59	Distinct Procedural Service	When a payer inappropriately bundles 31295 with another procedure performed at a clearly distinct anatomic site or separate encounter
-52	Reduced Services	Procedure partially completed (e.g., balloon placed but unable to dilate due to anatomic obstruction); document reason
-53	Discontinued Procedure	Procedure stopped for patient safety (vasovagal reaction, equipment failure); document thoroughly
-58	Staged or Related Procedure	Planned second-stage procedure within the 90-day global window
-78	Unplanned Return to OR	Unplanned return for complication (bleeding, mucosal tear) within global period
-79	Unrelated Procedure During Postoperative Period	Unrelated surgical procedure performed within the 90-day global window

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🩺 Common ICD-10-CM Pairings

Chronic Maxillary Sinusitis — Primary Indication

ICD-10 Code	Description	HCC?	Clinical Notes
J32.0	Chronic maxillary sinusitis	❌ No	Primary indication; requires documentation of ≥12 weeks of symptoms AND failure of medical management; no laterality distinction in ICD-10-CM for sinusitis — one code covers both sides
J32.4	Chronic pansinusitis	❌ No	Use when ALL sinuses are chronically inflamed; code only the maxillary component when pansinusitis is documented but the maxillary sinus is the treated site; code both J32.4 and secondary sinus-specific codes as appropriate
J32.9	Chronic sinusitis, unspecified	❌ No	Least-specific — use only when provider documents “chronic sinusitis” without naming the sinus; query the provider for sinus specificity before assigning

Recurrent Acute Maxillary Sinusitis

ICD-10 Code	Description	HCC?	Clinical Notes
J01.00	Acute maxillary sinusitis, unspecified	❌ No	For acute episodes; if documentation says “recurrent acute maxillary sinusitis,” use J01.01
J01.01	Acute recurrent maxillary sinusitis	❌ No	Use when provider documents recurrent acute episodes (typically ≥4/year); payer coverage for 31295 under recurrent acute sinusitis varies — verify LCD

Associated/Supporting Diagnosis Codes

ICD-10 Code	Description	HCC?	Clinical Notes
J34.89	Other specified disorders of nose and nasal sinuses	❌ No	Useful secondary code when ostial stenosis or anatomic obstruction is documented in addition to sinusitis diagnosis
J33.0	Polyp of nasal cavity	❌ No	Code additionally if nasal polyps are present but NOT obstructing the ostium targeted for balloon dilation; if polyps require removal, escalate to 31237 or appropriate polypectomy code — 31295 would no longer apply to that site
J34.2	Deviated nasal septum	❌ No	Secondary code when deviated septum contributes to sinus drainage impairment

Underlying Etiology / Complication Codes

ICD-10 Code	Description	HCC?	Clinical Notes
J30.9	Allergic rhinitis, unspecified	❌ No	Report as additional code when allergic rhinitis is a documented contributing etiology to chronic sinusitis; supports medical necessity narrative and CDI
J95.89	Other postprocedural complications and disorders of the respiratory system	❌ No	Use when a complication (synechiae formation, re-stenosis, postprocedural infection) is documented within the global period — this code supports the unrelated modifier -78 or -24 claims when applicable

Coding Specificity Reminder

ICD-10-CM does not differentiate chronic maxillary sinusitis by laterality — J32.0 covers right, left, and bilateral without separate codes. The operative laterality is captured in the CPT modifier (-RT, -LT, -50), not in the ICD-10-CM code. The most common specificity gap for this family is failure to distinguish chronic (J32.0) from acute recurrent (J01.01) sinusitis — the documentation must support one or the other, and if the physician documents only “sinusitis,” query for duration and recurrence pattern before assigning. ICD-10-CM specificity requirements are not optional.

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🏥 MS-DRG Considerations (Inpatient)

Inpatient Coding Reminder

CPT 31295 is performed exclusively in the outpatient, office, or ASC setting. There are no routine MS-DRG assignments for this procedure — inpatient admission solely for maxillary balloon sinus dilation would not be supported by any payer, MAC, or utilization review body. If a patient undergoing inpatient admission for an unrelated diagnosis also receives maxillary sinus balloon dilation, an ICD-10-PCS Dilation code may be assigned for completeness (see PCS section below), but it will have minimal to no meaningful impact on DRG grouping. For chronic sinusitis coded as the inpatient principal diagnosis (rare), the condition groups to MDC 03 (Diseases & Disorders of the Ear, Nose, Mouth, and Throat) and DRG 152/153 (Otitis Media & URI, with/without MCC/CC), but this DRG pathway is driven by the diagnosis — not by this procedure code.

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🔧 ICD-10-PCS Equivalents (Inpatient Facility Coding)

Note

ICD-10-PCS inpatient coding for maxillary balloon sinus dilation is uncommon — this procedure is nearly universally performed in outpatient or office settings. When coded inpatient, the root operation is Dilation (7) — expanding an orifice or the lumen of a tubular body part. The balloon catheter qualifies as an Intraluminal Device (D) character when the balloon is the primary mechanism of dilation; if the balloon is simply used as a guide tool and no device effect is left, No Device (Z) may be assigned. Refer to ICD-10-PCS Official Guidelines Section B3.12 and the FY2025 Coding Clinic for the most current guidance on device character assignment for temporary intraluminal devices.

PCS Code	Full Description	Applicable Scenario
097Q8DZ	Dilation of Right Maxillary Sinus with Intraluminal Device, Via Natural or Artificial Opening Endoscopic	Transnasal or canine fossa balloon dilation, right maxillary sinus, with balloon device character
097Q8ZZ	Dilation of Right Maxillary Sinus, Via Natural or Artificial Opening Endoscopic	Right maxillary sinus dilation, No Device (when balloon is considered a tool without lasting device effect)
097R8DZ	Dilation of Left Maxillary Sinus with Intraluminal Device, Via Natural or Artificial Opening Endoscopic	Transnasal or canine fossa balloon dilation, left maxillary sinus, with balloon device character
097R8ZZ	Dilation of Left Maxillary Sinus, Via Natural or Artificial Opening Endoscopic	Left maxillary sinus dilation, No Device

PCS Character Analysis — 097Q8DZ

Position	Character	Value	Definition
1	Section	0	Medical and Surgical
2	Body System	9	Ear, Nose, Sinus
3	Root Operation	7	Dilation (Expanding an orifice or the lumen of a tubular body part)
4	Body Part	Q	Maxillary Sinus, Right
5	Approach	8	Via Natural or Artificial Opening Endoscopic
6	Device	D	Intraluminal Device (balloon catheter used as the dilating instrument)
7	Qualifier	Z	No Qualifier

PCS Root Operation: Dilation (7) vs. Drainage (9)

• Use Dilation (7) when the primary objective is to expand or widen the maxillary sinus ostium — this is the correct root operation for balloon sinuplasty; the balloon’s role is to enlarge the opening, not to drain fluid.
• Use Drainage (9) when the primary objective is to remove fluid or pus from the sinus cavity (e.g., irrigation with aspiration of infected contents) — this would be a separate PCS code, typically 099Q8ZZ or 099R8ZZ, if a distinct drainage procedure is also performed.
• When bilateral maxillary sinus dilation is performed, assign separate PCS code lines for right (Q) and left (R) — PCS does not use modifier equivalents; laterality is captured in the body part character.

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📝 Coding Examples

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Example 1 — Office (POS 11): Unilateral Maxillary Balloon Sinuplasty with Same-Day Decision E/M

Clinical Scenario: A 44-year-old female with a 14-month history of right-sided maxillary pressure, purulent nasal drainage, and facial pain presents for a scheduled in-office balloon sinuplasty after failing a 6-week course of intranasal steroids and two rounds of antibiotics. CT sinuses (obtained at a prior visit) demonstrated right maxillary sinus opacification with ostial narrowing. Today, the ENT surgeon performs a focused E/M including review of CT findings and confirmation of the decision to proceed, then performs right maxillary balloon sinuplasty under topical anesthesia. The operative note states: “Right maxillary ostium identified transnasally under endoscopic visualization; balloon catheter introduced across ostium; balloon inflated × 2 to 10 atm for 8 seconds each pass; ostium confirmed patent; balloon removed; no tissue excised.”

Field	Code	Rationale
CPT — Procedure	31295-RT	Nasal/sinus endoscopy with balloon dilation, maxillary ostium; -RT for right side
CPT — E/M	99213-57	Office visit, established patient, moderate complexity; modifier -57 required on E/M because 31295 has a 90-day global period (major surgery) and the E/M documents the decision to proceed
PDx	J32.0	Chronic maxillary sinusitis — supported by >12 weeks of documented symptoms and CT findings

Note

Modifier -57 belongs on the E/M code, not on 31295. A common billing error is appending -25 to the E/M when the procedure has a 90-day global — -25 applies only to minor (000/010-day global) procedures. Using -25 here instead of -57 will trigger a Medicare claim review and potential recoupment. Document in the chart note that the E/M included independent medical decision-making regarding the surgical decision — the note cannot be a simple pre-procedure check-in.

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Example 2 — ASC (POS 24): Bilateral Maxillary + Frontal Balloon Dilation, Multiple Sinuses

Clinical Scenario: A 52-year-old male with chronic pansinusitis (J32.4) is taken to the ASC for bilateral maxillary and bilateral frontal balloon sinuplasty. Under general anesthesia, the ENT surgeon first performs transnasal balloon dilation of the right maxillary ostium, then the left maxillary ostium, then the right frontal sinus ostium using a dedicated frontal balloon catheter, then the left frontal ostium. The operative note confirms: “Balloon catheter only instrument used throughout; no tissue excised at any site; all four ostia confirmed widely patent post-dilation.”

Field	Code	Rationale
CPT 1	31295-RT	Dilation, right maxillary ostium
CPT 2	31295-LT	Dilation, left maxillary ostium (bilateral indicator 2 — bill as two separate lines, each at 100%)
CPT 3	31296-RT-51	Dilation, right frontal ostium; -51 for multiple procedures (lesser-valued procedure)
CPT 4	31296-LT-51	Dilation, left frontal ostium
PDx	J32.4	Chronic pansinusitis — drives the multi-sinus surgical plan

Warning

Do NOT report 31295 and 31296 with mutual exclusivity modifiers (59/XS) when they are performed on different sinuses — they are NOT column 1/column 2 edits against each other. The NCCI bundles apply only when the same sinus is targeted. The -51 modifier on the lesser-valued procedure (31296) is appropriate for multiple surgery reimbursement reduction. Bilateral indicator 2 for 31295 means each lateral line bills at full value — confirm the ASC is processing the bilateral lines correctly and not auto-reducing the second 31295 line to 50%.

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Example 3 — Outpatient Hospital (POS 22): Return Visit Within 90-Day Global — Postoperative Complication vs. Unrelated Visit

Clinical Scenario: A 38-year-old female underwent right maxillary balloon sinuplasty (31295-RT) six weeks ago (Day 0 of the 90-day global period). She presents today (Day 42) to the ENT clinic with right-sided facial pain and pressure. The physician examines her, reviews a new CT scan, and documents: “Patient presents with right-sided facial pain and pressure. Endoscopic exam today reveals re-stenosis of the right maxillary ostium, likely early synechia formation at the dilation site — directly related to the prior balloon procedure.” The physician elects to observe. No separate procedure performed.

Field	Code	Rationale
CPT — E/M	99213	Office/outpatient visit — NO modifier required and NOT separately billable — this visit is within the 90-day global period and the condition is directly related to the prior procedure; the visit is bundled into the global surgical payment
PDx	J32.0	Chronic maxillary sinusitis — underlying condition
SDx	J95.89	Other postprocedural complications of respiratory system — re-stenosis/synechia as a procedure-related complication

Note

Global period reminder: Because the visit is related to the prior 31295 procedure and falls within the 90-day global window, the E/M is not separately billable — it is included in the global surgical payment. If the patient had presented for a clearly unrelated condition (e.g., acute otitis media, pharyngitis, epistaxis from a nasal trauma), the E/M would be separately billable with modifier -24 appended to the E/M, and the documentation would need to explicitly state that the visit was for a condition unrelated to the prior sinus surgery. Failing to correctly apply global period rules — billing the related follow-up as a separate E/M — is among the most common ENT-specific overpayment findings in MAC post-payment audits.

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⚠️ Common Coding Pitfalls

• Using modifier -25 instead of -57 for the same-day E/M: Because 31295 carries a 90-day global period, it is classified as a major surgical procedure under Medicare Global Surgery Rules. The E/M on the same day requires modifier -57 (decision for major surgery) — not -25, which applies only to minor procedures. Applying -25 to a same-day E/M paired with a 90-day global procedure will trigger a Medicare claim edit, denial, or post-payment audit finding. The E/M documentation must explicitly reflect the decision-making process leading to the surgical plan, not merely the routine pre-procedure clearance.

• Reporting 31295 when tissue is removed at the same site: The AMA CPT parenthetical note is clear: do not report 31295 in conjunction with 31256 or 31267 when performed on the same sinus. If any tissue removal occurred — mucosal shaving, partial turbinoplasty, polypectomy — the procedure upgrades to 31256 (antrostomy) or 31267 (antrostomy with tissue removal), and 31295 is dropped. The operative note must contain the phrase “balloon catheter only, no tissue removed” or equivalent to support 31295 as the standalone procedure.

• Failing to distinguish the 90-day global period from the 10-day global of sibling codes: Some ENT endoscopy codes carry 000 or 010 global periods; 31295, 31296, 31297, and 31298 all carry 090 global periods. Applying a 10-day global billing workflow to these codes — releasing follow-up visits for separate billing after 10 days — will generate overpayments subject to recoupment. Operational billing workflows must flag 31295 claims for the full 90-day global window.

• Billing 31295 and 31233 together on the same sinus: CPT 31233 (diagnostic sinusoscopy of the maxillary sinus) is a column 2 code relative to 31295 on the same sinus — do not report the diagnostic sinusoscopy separately when it is performed as part of the surgical balloon dilation approach. The diagnostic component is integral to and bundled into the surgical code.

• Non-balloon dilation coded to 31295: If a fixed (non-balloon) dilator — such as a reusable mechanical dilator or trocar — is used instead of a balloon catheter, 31295 does not apply. Per CMS and payer coverage policy, the 31295-31298 code family is specifically designated for balloon catheter dilation. Fixed dilator use should be reported with 31299 (unlisted procedure, accessory sinuses) until a more specific code exists.

• Defaulting to J32.9 without querying: When the operative report identifies the maxillary sinus as the site of surgery but the diagnostic documentation reads only “chronic sinusitis,” do not default to J32.9 (unspecified). Query the treating provider to confirm the sinus-specific diagnosis. Most providers will confirm J32.0 (chronic maxillary sinusitis) readily — the sinus operated upon is in the operative report. ICD-10-CM specificity is a documentation requirement, not a guideline suggestion.

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📎 Sources

¹AMA CPT 2025 Professional Edition — CPT 31295, Parenthetical Notes, Endoscopy Procedures on the Accessory Sinuses · ²CMS 2025 Medicare Physician Fee Schedule Final Rule (CMS-1807-F) · ³CMS RVU25A Relative Value Files — CPT 31295 (wRVU 2.70, Global 090, Bilateral Indicator 2) · ⁴NCCI Policy Manual Chapter 4 & Chapter 5, CMS 2025 — Endoscopy Bundling and Global Surgery Rules · ⁵ICD-10-CM Official Guidelines for Coding and Reporting FY2025 — Chapter 10 (Diseases of the Respiratory System) · ⁶ICD-10-PCS Official Guidelines for Coding and Reporting FY2025 — Section B3.12, Root Operation Dilation · ⁷AAO-HNS — CPT for ENT: Balloon Sinus Dilation (December 2023 update) — entnet.org/resource/cpt-for-ent-balloon-sinus-dilation-2/ · ⁸Medtronic Reimbursement — Nasal and Sinus Procedures Commonly Billed Codes, Effective January 1, 2025 · ⁹Fallon Health Clinical Coverage Criteria — Balloon Sinus Ostial Dilation (March 2025) · ¹⁰AAPC Codify — CPT 31295, Endoscopy Procedures on the Accessory Sinuses