🗣️ CPT 31529 — Laryngoscopy, Direct, With Or Without Tracheoscopy; With Dilation, Subsequent
Quick Reference
wRVU: 2.61 | Global Period: 000 | Assistant Payable: Conditional; Medicare assistant-at-surgery payment restriction applies unless medical necessity is supported | Bilateral Indicator: 9 Rule: CPT 31529 7th reports a subsequent direct laryngoscopic dilation after prior dilation treatment. The dilation must be performed during direct laryngoscopy, with or without tracheoscopy, and documentation must establish that it is subsequent rather than the initial dilation. The bilateral-surgery concept does not apply to this laryngeal procedure.1
📋 Clinical Description
CPT 31529 describes direct laryngoscopy, with or without tracheoscopy, with dilation performed as a subsequent treatment for laryngeal narrowing. The procedure may be used to treat recurrent or persistent laryngeal stenosis after an initial dilation. The operative report should identify the location and cause of stenosis when known, the prior dilation history, the method of current dilation, the resulting airway caliber when documented, and whether tracheoscopy was also performed.2
CPT 31529 differs from 31528, which reports the initial direct laryngoscopic dilation. Do not select the subsequent-dilation code merely because the patient had a prior airway procedure; the current service must be a subsequent dilation in the relevant treatment course. CPT 31530 reports direct operative laryngoscopy with foreign-body removal, while 31535 reports direct operative laryngoscopy with biopsy; neither service is included in 31529 when independently performed and separately reportable under current edits and documentation requirements.2
This procedure may be performed in the following clinical contexts:
- Recurrent laryngeal stenosis — The patient has persistent or recurrent laryngeal narrowing after prior initial dilation. The record should identify the stenotic site and prior dilation history.
- Congenital laryngeal stenosis — A patient with documented congenital laryngeal narrowing undergoes repeat endoscopic dilation. The provider must document the congenital condition and the therapeutic purpose of repeat dilation.
- Laryngeal web — A laryngeal web causes airway or voice symptoms and has been previously treated. Subsequent dilation may be performed when medically necessary and documented.
- Postprocedural airway narrowing — A patient develops or continues to have laryngeal narrowing after prior airway treatment. Code a confirmed postprocedural respiratory complication only when the provider documents the causal relationship.
🔬 Anatomical & Procedural Considerations
| Variant | Mechanism | Key Notes |
|---|---|---|
| Initial laryngeal dilation | The first direct laryngoscopic dilation is performed to enlarge a documented laryngeal narrowing. It begins the dilation treatment sequence. | Report 31528 for the initial dilation. The operative report should establish that it is the first dilation in the documented treatment course. |
| Subsequent laryngeal dilation | Repeat direct laryngoscopy with dilation is performed for recurrent, persistent, or planned continued treatment of laryngeal narrowing. | Report 31529 only when the service is subsequent to an initial dilation. Include the reason repeat dilation is medically necessary. |
| Diagnostic or operative laryngoscopy without dilation | Direct laryngoscopy may be performed to inspect, biopsy, remove a foreign body, or treat a lesion without dilation. | Do not report 31529 when dilation is not performed. Select the code matching the documented diagnostic or operative service. |
Clinical Pearl
“Subsequent” describes the dilation sequence, not simply the fact that the patient is established or has a history of airway disease. The operative report should explicitly support prior dilation and current repeat dilation. If the record only identifies prior laryngoscopy without prior dilation, do not assume that 31529 is supported.2
✅ Procedure Includes
- Direct laryngoscopic visualization necessary to perform the subsequent dilation.
- Dilation of the documented laryngeal narrowing.
- Tracheoscopy performed during the same laryngoscopic service when documented.
- Routine intraoperative monitoring, visualization, and hemostasis integral to the dilation.
- Same-day customary postoperative care included in the 0-day global period.
❌ Excludes / Do Not Report Together
| Code | Description | Relationship |
|---|---|---|
| 31528 | Laryngoscopy, direct, with or without tracheoscopy; with dilation, initial | Do not report with 31529 for the same dilation service. Select the code based on whether the documented dilation is initial or subsequent. |
| 31530 | Laryngoscopy, direct, operative, with foreign body removal | Do not separately report when foreign-body removal is integral to the dilation service. A distinct foreign-body procedure requires separate documentation and compliance with current edit rules. |
| 31535 | Laryngoscopy, direct, operative, with biopsy | Do not separately report a biopsy that is integral to the same laryngoscopy and dilation. A separately reportable biopsy must be distinct, medically necessary, and supported by documentation. |
| 31540 | Laryngoscopy, direct, operative, with excision of tumor and/or stripping of vocal cords or epiglottis | Do not report with 31529 for work integral to the dilation. If a distinct excision is performed, evaluate current NCCI edits, documentation, and payer policy. |
| 31545 | Laryngoscopy, direct, operative, with operating microscope or telescope, with submucosal removal of non-neoplastic lesion(s) of vocal cord; reconstruction with local tissue flap(s) | This code describes a different operative service involving submucosal lesion removal and reconstruction. Do not report it instead of, or in addition to, 31529 unless distinct work is supported and permitted. |
Bundling Alert
CPT 31529 has a 0-day global period. Routine same-day recovery care and usual immediate follow-up are included. Report a same-day E/M service with -25 only when it is significant and separately identifiable from the evaluation necessary to perform the direct laryngoscopy and dilation; use -59 only for a properly documented distinct procedural service, not to bypass bundling edits.1
🌳 Code Tree — Surgery: Direct Laryngoscopy
CPT 31525-31545 Laryngoscopy, Direct, With or Without Tracheoscopy
│
├── 31525 Laryngoscopy, direct, with or without tracheoscopy; diagnostic, except newborn
├── 31526 Laryngoscopy, direct, with or without tracheoscopy; diagnostic, with operating microscope or telescope
├── 31527 Laryngoscopy, direct, with or without tracheoscopy; with insertion of obturator
│
├── 31528-31529 Laryngoscopy, direct, with dilation
│ ├── 31528 Laryngoscopy, direct, with or without tracheoscopy; with dilation, initial (Global: 000)
│ ├── ▶▶ 31529 ◀◀ Laryngoscopy, direct, with or without tracheoscopy; with dilation, subsequent ← YOU ARE HERE (Global: 000)
│ ├── 31530 Laryngoscopy, direct, operative, with foreign body removal (Global: 000)
│ └── 31531 Laryngoscopy, direct, operative, with foreign body removal; with operating microscope or telescope (Global: 000)
│
└── 31535-31545 Direct operative laryngoscopy with biopsy, excision, stripping, or reconstruction💰 RVU & Reimbursement Profile
| Component | Value |
|---|---|
| Work RVU | 2.61 |
| Global Period | 000 |
| Bilateral Indicator | 9 |
| Assistant Surgeon | 0 — Payment restriction applies unless medical necessity is documented |
| Co‑Surgeon | 0 — Co-surgery does not apply |
| Team Surgery | 0 — Team surgery does not apply |
| PC/TC Split | 0 — Physician service; PC/TC concept does not apply |
| Modifier -51 Exempt | No |
| Anesthesia | Separately reportable by the qualified anesthesia provider when medically necessary and documented |
Bilateral Billing Rules
The larynx is a midline airway structure, and the CMS bilateral-surgery indicator is 9. Do not append -50, -RT, or -LT to report dilation of two areas within the larynx. If more than one distinct airway procedure is performed, report only services that are separately supported by documentation and allowed under applicable edits and payer policy.1
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -25 | Significant, Separately Identifiable Evaluation and Management Service by the Same Physician or Other Qualified Health Care Professional on the Same Day of the Procedure or Other Service | Append to the E/M service, not 31529, when a significant and separately identifiable E/M service is performed on the same day. Routine assessment needed to perform the dilation does not support this modifier. |
| -51 | Multiple Procedures | Use when multiple separately reportable procedures are performed during the same session, subject to payer rules. Do not use it to unbundle work integral to direct laryngoscopy or dilation. |
| -52 | Reduced Services | Use when the planned dilation service is reduced at the physician’s discretion and documentation explains the reduced work. Do not use it merely because the stenotic segment is short. |
| -53 | Discontinued Procedure | Use when the procedure is started but discontinued because of extenuating circumstances or a threat to patient well-being. The operative report must identify the reason and completed work. |
| -59 | Distinct Procedural Service | Use only when a separately performed service is distinct by site, lesion, encounter, or independent procedural work and no more specific modifier applies. It must not be used to bypass an edit for integral laryngoscopy work. |
| -76 | Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional | Use only when the same procedure is repeated by the same physician or other qualified health care professional and documentation supports repeat performance. It does not determine whether the dilation is initial or subsequent. |
| -77 | Repeat Procedure by Another Physician or Other Qualified Health Care Professional | Use only when another physician or qualified health care professional repeats the same procedure and documentation supports the repeat service. Verify payer-specific repeat-procedure rules. |
| -80 | Assistant Surgeon | May be considered only when an assistant is medically necessary and documentation supports payment under the applicable payer policy. Medicare applies an assistant-at-surgery payment restriction to this code. |
| -AS | Physician Assistant, Nurse Practitioner, or Clinical Nurse Specialist Services for Assistant at Surgery | Use only when an eligible nonphysician practitioner assists at surgery, the service is medically necessary, and payer coverage requirements are met. Verify supervision and credentialing requirements. |
🩺 Common ICD‑10‑CM Pairings
Primary Diagnosis Group
| ICD‑10 | Description | HCC? | Notes |
|---|---|---|---|
| J38.6 | Stenosis of larynx | No | Common diagnosis for laryngeal narrowing treated with direct dilation. The provider should document laryngeal location and clinical indication. |
| Q31.0 | Web of larynx | No | Use when the provider documents a congenital laryngeal web. Do not assign based solely on endoscopic appearance without provider diagnosis. |
| Q31.3 | Congenital stenosis of larynx | No | Use when congenital laryngeal stenosis is documented. It may support repeat dilation when medically necessary. |
| J39.8 | Other specified diseases of upper respiratory tract | No | Use only when the provider documents a qualifying specified upper-respiratory condition and a more specific code is unavailable. Do not substitute it for documented laryngeal stenosis. |
Secondary Group
| ICD‑10 | Description | HCC? | Notes |
|---|---|---|---|
| J38.7 | Other diseases of larynx | No | Use when the provider documents another specified laryngeal disorder without a more specific diagnosis code. Confirm that it is relevant to the need for dilation. |
| J95.89 | Other intraoperative and postprocedural complications and disorders of respiratory system, not elsewhere classified | No | Use only when the provider establishes a causal relationship between prior treatment and the respiratory complication. Do not infer a postprocedural complication from recurrent stenosis alone. |
Etiology / Complication
| ICD‑10 | Description | HCC? | Notes |
|---|---|---|---|
| J95.03 | Malfunction of tracheostomy stoma | No | Use only when a documented tracheostomy-stoma malfunction is evaluated or treated. It does not describe laryngeal stenosis by itself. |
| J38.5 | Laryngospasm | No | Do not use for fixed laryngeal stenosis unless the provider specifically documents laryngospasm. A transient functional spasm is not the same as a structural narrowing treated by dilation. |
Coding Specificity Reminder
Code the documented cause of laryngeal narrowing whenever established, including congenital disease or a confirmed postprocedural complication. Do not infer etiology from the fact that a dilation was performed. The subsequent-dilation CPT designation does not itself establish recurrence, complication status, or congenital origin.3
🏥 MS‑DRG Considerations
CPT 31529 does not independently determine an MS-DRG. When performed in an inpatient setting, assign ICD-10-PCS based on the documented laryngeal dilation technique, approach, and whether an intraluminal device remains in place. No nationwide NCD specifically governing CPT 31529 was identified, and no universally applicable LCD was identified in the Medicare Coverage Database review. The CMS PFS Lookup tool provides payment information and policy indicators, including RVUs and global period, while the MCD is used to identify any applicable MAC-specific LCD or billing-and-coding article; confirm local requirements for the claim jurisdiction before billing.145
🔧 ICD‑10‑PCS Equivalents
| PCS Code | Full Description | Modality |
|---|---|---|
| 0C7S8ZZ | Dilation of Larynx, Via Natural or Artificial Opening Endoscopic | Endoscopic dilation without intraluminal device |
| 0C7S8DZ | Dilation of Larynx with Intraluminal Device, Via Natural or Artificial Opening Endoscopic | Endoscopic dilation with intraluminal device |
| 0C7S7ZZ | Dilation of Larynx, Via Natural or Artificial Opening | Dilation without endoscopic approach |
| 0C7S7DZ | Dilation of Larynx with Intraluminal Device, Via Natural or Artificial Opening | Dilation with intraluminal device |
CPT 31529 does not map one-to-one to ICD-10-PCS. Select PCS code based on the actual approach and whether an intraluminal device remains at the end of the procedure. For direct laryngoscopy with endoscopic dilation, the via-natural-or-artificial-opening endoscopic approach is commonly evaluated, but final selection must follow the operative report and PCS definitions.5
PCS Character Analysis
| Position | Character | Value | Definition |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical. This section includes operative procedures performed to treat or alter body structures. |
| 2 | Body System | C | Mouth and Throat. The larynx is classified in this PCS body system. |
| 3 | Root Operation | 7 | Dilation. Dilation means expanding an orifice or the lumen of a tubular body part. |
| 4 | Body Part | S | Larynx. Select this value when the documented dilation targets the laryngeal lumen. |
| 5 | Approach | 8 or 7 | 8 is via natural or artificial opening endoscopic, and 7 is via natural or artificial opening. Select the approach from the documented technique. |
| 6 | Device | Z or D | Z means no device and D means intraluminal device. Select D only when an intraluminal device remains in place at the end of the procedure. |
| 7 | Qualifier | Z | No qualifier. Use another qualifier only when supported by the PCS table and operative documentation. |
Root Operation Comparison
- Dilation applies when the objective is expanding the narrowed laryngeal lumen. It is the appropriate root operation for laryngeal stenosis treated by dilation.
- Extirpation applies to taking or cutting out solid matter, such as a foreign body, and is not assigned simply because dilation instruments contact scar tissue.
- Excision applies when tissue is cut out or off. Do not assign excision for incidental tissue manipulation during a dilation unless separately documented and reportable.
📝 Coding Examples
Example 1
Clinical Scenario: A patient with documented laryngeal stenosis previously underwent initial direct laryngoscopy with dilation. The patient returns with recurrent narrowing and undergoes direct laryngoscopy with repeat dilation. The operative report documents prior dilation, current laryngeal stenosis, and successful subsequent dilation.
| Field | Code | Rationale |
|---|---|---|
| CPT | 31529 | The documented repeat direct laryngoscopic dilation is subsequent to a prior initial dilation. |
| PDx | J38.6 | The provider documents laryngeal stenosis as the reason for dilation. |
Note
The operative report should identify the prior dilation and current repeat dilation. If the service is the first dilation in the treatment course, report 31528 instead.
Example 2
Clinical Scenario: A patient with congenital laryngeal stenosis undergoes the first direct laryngoscopic dilation in the current treatment course. The surgeon performs direct laryngoscopy with dilation and documents that no prior dilation has been performed.
| Field | Code | Rationale |
|---|---|---|
| CPT | 31528 | The procedure is the initial direct laryngoscopic dilation. |
| PDx | Q31.3 | The provider documents congenital stenosis of the larynx. |
Warning
Do not report 31529 only because the patient has a chronic congenital condition or prior airway evaluations. The current dilation must be subsequent to prior dilation treatment.
Example 3
Clinical Scenario: A patient undergoes direct laryngoscopy with subsequent dilation for recurrent laryngeal stenosis. During the same encounter, the physician performs a separately documented E/M service addressing a new, unrelated acute respiratory complaint that exceeds the usual preprocedure evaluation.
| Field | Code | Rationale |
|---|---|---|
| CPT | 31529 | The procedure is a documented subsequent dilation of laryngeal stenosis. |
| CPT | E/M service--25 | Append -25 only to the separately reported E/M code when the unrelated E/M service is significant and separately identifiable. |
| PDx | J38.6 | The laryngeal stenosis supports the need for dilation. |
Global period reminder
CPT 31529 has a 0-day global period. Same-day E/M reporting requires documentation demonstrating work beyond the usual evaluation necessary to perform direct laryngoscopy with dilation.
⚠️ Common Coding Pitfalls
- Pitfall 1: Reporting 31529 for the first laryngeal dilation. Use 31528 for the initial dilation and reserve 31529 for a subsequent dilation.
- Pitfall 2: Assuming that prior laryngoscopy establishes a subsequent dilation. The prior service must have included dilation, not merely diagnostic laryngoscopy or another airway procedure.
- Pitfall 3: Reporting 31529 when dilation was not actually performed. Select the CPT code matching the documented diagnostic, foreign-body, biopsy, or lesion procedure instead.
- Pitfall 4: Separately billing direct laryngoscopy when it is integral to the dilation. The laryngoscopic work required to perform the service is included in 31529.
- Pitfall 5: Using -50, -RT, or -LT for laryngeal dilation. The larynx is a midline structure and the bilateral-surgery concept does not apply.
- Pitfall 6: Coding a postprocedural complication without provider linkage. A history of prior surgery or airway intervention does not alone support J95.89.
📎 Sources
1 Centers for Medicare & Medicaid Services. Medicare Physician Fee Schedule Look-Up Tool and CY 2026 PFS Relative Value Files, 2026. CPT 31529: work RVU 2.61, global period 000, PC/TC indicator 0, bilateral-surgery indicator 9, and assistant-at-surgery payment restriction indicator 0.
2 American Medical Association. Current Procedural Terminology, CPT 2026 Professional Edition. Direct-laryngoscopy dilation codes 31528 and 31529.
3 Centers for Medicare & Medicaid Services. ICD-10-CM Official Guidelines for Coding and Reporting and FY 2026 ICD-10-CM code set, 2026.
4 Centers for Medicare & Medicaid Services. Medicare Coverage Database Search, reviewed August 10, 2026. No nationwide NCD or universally applicable LCD specifically governing CPT 31529 was identified; verify active MAC-specific LCDs and billing-and-coding articles for the applicable jurisdiction.
5 Centers for Medicare & Medicaid Services. FY 2026 ICD-10-PCS Official Guidelines for Coding and Reporting and ICD-10-PCS Table 0C7, 2026.
Sources listed above correspond to superscript citations throughout this note. Verify all Medicare payment figures against your current CMS PFS Lookup tool and applicable MAC LCD prior to claim submission. Please use the latest AAPC/AHIMA Coding Books to verify each code within this note.