Quick Answer
CPT code 92550 is the bundled billing code for tympanometry (CPT 92567) plus acoustic reflex threshold measurements (CPT 92568), performed together in one visit. It is the correct code whenever both tests are done on the same date of service — billing them separately as 92567 + 92568 is unbundling and a top audit risk. Medicare reimburses approximately $38–$45 nationally. Common modifiers include 52 (unilateral testing), 59 (distinct service same day), and AB (audiologist-performed).
Frequently Asked Questions About CPT Code 92550
What Is CPT Code 92550?
CPT code 92550 is the bundled diagnostic code for tympanometry plus acoustic reflex threshold measurements — two tests that together provide a comprehensive picture of middle ear function. It sits within the audiology and hearing assessment section of the CPT coding system and is one of the most commonly billed ENT diagnostic codes.
The two components that make up 92550:
- Tympanometry (CPT 92567) — Measures eardrum (tympanic membrane) mobility by varying air pressure in the ear canal. Generates a tympanogram curve that reveals middle ear pressure, fluid presence, eardrum perforations, and eustachian tube function.
- Acoustic Reflex Threshold Measurements (CPT 92568) — Delivers a loud sound stimulus to elicit the stapedius muscle reflex. Elevated or absent reflexes indicate nerve pathway abnormalities, ossicular chain problems, or sensorineural hearing loss.
When both tests are performed in the same visit, billing rules require using 92550 only. Billing 92567 and 92568 separately on the same date is unbundling — a compliance violation.
CPT 92550 Description: What the Code Actually Covers
The official AMA description:
“Tympanometry and reflex threshold measurements.”
Breaking that into its billing components:
| Component | What It Tests | CPT If Billed Alone |
|---|---|---|
| Tympanometry | Eardrum mobility, middle ear pressure, fluid presence, eustachian tube function | 92567 |
| Acoustic Reflex Threshold | Stapedius reflex response to sound — tests nerve pathways from cochlea to brainstem | 92568 |
| Both Together (92550) | Complete middle ear assessment — structural + neural | 92550 (bundle) |
CPT 92550 vs 92567 + 92568: When to Use Each
The rule is simple but frequently misapplied. Here is when each billing approach is correct:
| Scenario | Correct Code | Notes |
|---|---|---|
| Both tympanometry AND acoustic reflex testing performed — same visit | 92550 | Always bundle. Billing separately = unbundling violation. |
| Tympanometry only — no reflex testing performed | 92567 | Bill the component code when only one test is done. |
| Acoustic reflex testing only — no tympanometry | 92568 | Bill the component code when only one test is done. |
| Both tests — different dates of service | 92567 + 92568 on separate dates | Component codes are correct when tests are on different days. |
| Billing 92567 + 92568 on the same date | ❌ Unbundling | NCCI edit triggers automatic denial or downcode to 92550. |
When to Use CPT 92550: Clinical Scenarios
CPT 92550 applies whenever both tympanometry and acoustic reflex testing are clinically indicated and performed in the same session. These are the three most common presentations:
👶 Pediatric Otitis Media
A 6-year-old presents with ear tugging, fever, and failed hearing screening. Tympanometry shows a Type B flat curve (fluid present). Acoustic reflexes are absent at 90 dB. Diagnosis: acute otitis media with effusion. Bill 92550 — both tests were performed, and results are clinically linked.
✈️ Eustachian Tube Dysfunction (Adult)
An adult reports ear fullness after flying and intermittent hearing loss. Tympanometry reveals negative middle ear pressure (-250 daPa). Acoustic reflexes are present but with elevated thresholds. Bill 92550. If cerumen removal (69210) is also performed, add it separately with Modifier 59.
🔊 Sensorineural Hearing Loss Workup
A 55-year-old presents with progressive unilateral hearing loss. Tympanometry is normal (Type A curve). Acoustic reflexes are absent on the affected side at all frequencies — suggesting retrocochlear pathology. Bill 92550. If a comprehensive audiogram (92557) was also done, add Modifier 59 to 92550.
Modifiers for CPT 92550
Modifier errors cause approximately 23% of CPT 92550 claim denials according to published ENT billing audits. Apply the correct modifier every time:
Reduced Service
Use when testing is unilateral (one ear only). Document why the contralateral ear was not tested — e.g., post-surgical canal, draining perforation, patient intolerance.
Distinct Service
Apply when 92550 is billed same-day as another audiology or ENT procedure (e.g., 92557, 92570, 69210). Without this, payers may bundle and pay only the higher-value code.
Audiologist-Performed
Required by many payers when a non-physician audiologist performs the test. UnitedHealthcare, Cigna, and some Medicaid plans require this for audiologist billing.
Repeat Procedure
Use when 92550 is repeated on the same date by the same provider — e.g., pre- and post-cerumen removal. Document clinical justification for the repeat in the visit note.
Technical Component
Required by some Medicaid plans for facility/technical billing. The interpreting physician bills Modifier 26 separately for the professional component.
CPT 92550 Reimbursement Rates: Medicare and Private Payers
CPT 92550 is a lower-dollar diagnostic code, but high claim volume makes billing accuracy critical. Even small per-claim errors compound significantly across hundreds of monthly claims. Use the CMS Physician Fee Schedule lookup for exact rates in your locality, and ensure your revenue cycle process includes periodic fee schedule audits.
| Payer | National Avg. Rate (92550) | Key Requirements |
|---|---|---|
| Medicare | ~$38–$45 | Medical necessity documented; physician or supervised NP/PA ordering |
| Aetna | ~$38.50 | Prior auth may be required for patients under 12 years |
| UnitedHealthcare | ~$35.75 | Modifier AB required when audiologist performs the test |
| BCBS (varies by plan) | ~$36–$48 | Check BCBS payer policy — rates vary significantly by region |
| Medicaid (varies by state) | $25–$40 | TC modifier often required; some states require prior authorization |
| Commercial (contracted) | 100–150% of Medicare | Per payer contract — audit your EOBs to confirm correct rate is applied |
ICD-10 Codes That Support CPT 92550
Pairing the correct ICD-10 diagnosis code establishes medical necessity. Payers increasingly deny claims that link CPT 92550 to non-specific or mismatched diagnoses. Use the most clinically specific code:
| ICD-10 Code | Description | Clinical Context |
|---|---|---|
| H65.00 | Acute serous otitis media, unspecified ear | Fluid in middle ear — Type B tympanogram typical |
| H65.90 | Nonsuppurative otitis media, unspecified | Chronic effusion without infection |
| H69.00 | Eustachian tube dysfunction, unspecified ear | Negative pressure on tympanogram (Type C curve) |
| H90.0 | Conductive hearing loss, bilateral | Absent or elevated acoustic reflexes with flat tympanogram |
| H90.11 | Conductive hearing loss, unilateral, right ear | Use laterality-specific codes whenever possible |
| H61.20 | Imperfect closure of tympanic membrane | Perforation — Type AD/B tympanogram |
| H93.19 | Tinnitus, unspecified | When tinnitus prompts reflex testing for retrocochlear workup |
| H91.90 | Unspecified hearing loss, unspecified ear | Use only when laterality and type cannot be determined |
| Z01.10 | Encounter for exam of ears and hearing, without abnormal findings | Use for screening — note: Medicare does not cover routine screening 92550 |
⚠️ Using Z01.10 (routine screening) as the supporting diagnosis for Medicare 92550 claims results in automatic non-coverage denial. Medicare covers 92550 only with a medically active diagnosis — H65, H69, H90, or equivalent.
Medical Necessity Documentation Checklist for CPT 92550
Payers increasingly audit audiology claims for documentation gaps. Before submitting any 92550 claim, confirm the medical record contains:
📋 CPT 92550 Pre-Submission Checklist
How to Reduce Denials for CPT 92550
The two most common denial reasons for CPT 92550 are missing modifiers (23% of denials) and documentation gaps (17%). Here are the six most frequent failure points and how to prevent them:
❌ Unbundling (Billing 92567 + 92568 Separately)
The single most common error. NCCI edits automatically catch this and either deny both codes or downcode to 92550 without extra payment. Use 92550 any time both tests are performed on the same date.
❌ Missing Modifier AB for Audiologist
When a non-physician audiologist performs 92550, payers like UHC and Cigna require Modifier AB. Failing to append it triggers a denial that requires re-billing — not just appeal — to fix.
❌ Routine Screening Diagnosis with Medicare
Billing 92550 under Z01.10 (routine hearing screening) to Medicare results in automatic non-coverage denial. Medicare only pays for medically necessary diagnostic testing prompted by a specific symptom or diagnosis.
❌ Same-Day Bundling Without Modifier 59
Billing 92550 same-day as 92557 (comprehensive hearing exam) or 92570 (acoustic immittance testing) without Modifier 59 causes automatic bundling — payers pay only the higher-value code.
❌ Missing Tympanogram in the Record
On audit, the tympanogram graph must be in the medical record. “Tympanometry performed — normal” without the actual graph is insufficient. Save and attach the printed/digital tympanogram output to every visit note.
❌ Exceeding Frequency Limits Without Justification
Most payers limit 92550 to 2–3 tests per year. Beyond that, a letter of medical necessity must accompany the claim — e.g., monitoring a child with recurrent otitis media or post-surgical follow-up. Consistent billing management catches frequency edits before claims go out.
CPT 92550 in the Audiology Code Family
Understanding where 92550 sits in the full audiology code set prevents miscoding across related procedures. For a complete reference across all specialty CPT codes, see our CPT coding guide by medical specialty.
| CPT Code | Description | Billable Alone? |
|---|---|---|
| 92550 | Tympanometry + acoustic reflex threshold — bundled (92567 + 92568) | Yes — when both done same visit |
| 92557 | Comprehensive audiometry — air/bone conduction + speech (92551 + 92552 + 92553) | Yes |
| 92567 | Tympanometry only | Yes — when done alone or on different date from 92568 |
| 92568 | Acoustic reflex threshold measurements only | Yes — when done alone or on different date from 92567 |
| 92570 | Acoustic immittance testing — includes 92550 + acoustic reflex decay | Yes — more comprehensive than 92550 |
| 92587 | Distortion product evoked otoacoustic emissions — screening | Yes |
| 69210 | Cerumen removal (manual) — one ear | Yes — bill separately with Modifier 59 when done same day as 92550 |
ENT Billing Errors Are Costing Your Practice Real Revenue
Unbundling, missing modifiers, and wrong diagnosis codes on 92550 claims add up fast. Our billing team handles ENT coding daily — we audit your workflow, fix the gaps, and manage your submissions end-to-end.
