CPT code 92550 – Tympanometry and acoustic reflex threshold

Key takeaways

CPT Code 92550 is a bundled code covering both tympanometry and acoustic reflex threshold testing in one visit

Bill CPT 92567 for tympanometry alone and CPT 92568 for acoustic reflex thresholds alone

Medicare pays 92550 under the Physician Fee Schedule, so verify current rates in the CMS PFS Look-Up Tool before billing

Modifier -52 applies when only one component is completed, and modifier -59 marks a distinct same-day service

Pabau’s claims management software standardizes how codes and modifiers are captured at the point of documentation, then routes 92550 claims through electronic clearinghouse submission

CPT Code 92550: definition, procedure scope, and when to use it

CPT Code 92550 is the AMA-defined code for tympanometry with reflex threshold measurements. It covers a combined evaluation of middle ear function, performed in a single clinical session. The code sits within the Audiologic Function Tests section (92550-92700) of the CPT code set.

The procedure has two components. Tympanometry measures middle ear pressure, mobility, and volume by introducing a tone and varying air pressure in the sealed ear canal. Acoustic reflex threshold testing measures the minimum sound level that triggers the stapedial reflex, a protective muscle contraction in response to loud sound.

Together, these tests support diagnosis of middle ear pathology, conductive hearing loss, Eustachian tube dysfunction, and retrocochlear disorders. Use 92550 when both components are completed in the same encounter. If only tympanometry is performed, bill CPT 92567 instead. If only the acoustic reflex threshold is measured, bill CPT 92568, the standalone code for acoustic reflex testing, threshold.

CPT 92550 vs related audiology codes

Selecting the correct code from the audiology section prevents both underbilling and NCCI bundling denials. The table below compares 92550 with the codes most frequently confused with it, including their scope, standalone billing status, and common pairing rules.

Before billing 92557 alongside CPT Code 92550 on the same date, verify current NCCI edit tables. Payer-specific bundling rules can differ from national NCCI edits, mainly under commercial policies. Always confirm medical necessity is documented for each code billed.

Medicare reimbursement for CPT Code 92550

Medicare reimburses CPT Code 92550 under the Medicare Physician Fee Schedule (MPFS), run by the Centers for Medicare and Medicaid Services. Payment rates are updated each year and vary by geographic locality. Pull current figures from the CMS PFS Look-Up Tool rather than from published benchmarks, which often reflect a prior fee schedule year.

RVU components behind the payment

Medicare payment is calculated from Relative Value Units (RVUs) multiplied by the annual conversion factor. The three RVU components for 92550 are work RVU (physician effort and skill), practice expense RVU (overhead), and malpractice RVU. Take the current values from the CMS fee schedule file before you submit.

Non-facility (office) rates for 92550 are often higher than facility rates, because the practice expense RVU accounts for equipment the practice owns and operates. In a hospital outpatient department, the facility carries that overhead instead, so the practice expense component is lower.

Non-Medicare payer coverage

Commercial insurers often cover CPT Code 92550 when medical necessity is established, though reimbursement rates vary. Most private payers use Medicare rates as a reference, paying anywhere from 80% to 130% of the MPFS rate depending on contract terms.

Medicaid coverage for 92550 differs by state. Pediatric audiology claims under Medicaid may carry extra authorization requirements. Check your payer’s fee schedule and prior authorization rules before the procedure is scheduled.

Which modifiers apply, and when

Applying the correct modifier prevents denials and audit exposure. The modifiers below are most frequently applicable to tympanometry and acoustic reflex threshold billing.

Modifier -59 requires robust documentation. The clinical record must show that 92550 was performed as a distinct service, with a separate indication from any other same-day procedure. Without that proof, payers will deny the unbundled claim on audit. Confirm the current NCCI edit rules with the AAPC Codify tool before you apply modifier -59 as routine.

ICD-10 codes that establish medical necessity

Every 92550 claim needs a diagnosis code that establishes medical necessity. The relevant ICD-10-CM codes sit in the H-series, which covers diseases of the ear and mastoid process. Pairing 92550 with a vague or mismatched diagnosis is a frequent denial trigger on first submission.

Code to the highest specificity available. If the patient’s laterality is documented (left, right, or bilateral), use the laterality-specific ICD-10 code rather than the unspecified variant. Payers including CMS follow CMS ICD-10 coding guidelines that require the most specific code the documentation supports.

What the record must show

A post-payment audit tests the chart, not the claim. To support CPT Code 92550, the clinical record must contain each of the following before the claim is submitted.

• Indication for testing: The referring or treating clinician’s documented reason for ordering both tympanometry and acoustic reflex threshold testing. A note reading “hearing evaluation” is not enough. The specific clinical question must be clear.
• Tympanogram results: Tympanogram type (Type A, B, C, or variant), peak pressure in daPa, static compliance in cc, and ear canal volume. Results for each ear tested must appear separately.
• Acoustic reflex threshold results: Threshold levels in dB HL for ipsilateral and contralateral reflexes at the frequencies tested. Document which frequencies were assessed, and whether reflexes were present, elevated, or absent.
• Clinical interpretation: A narrative or structured interpretation linking the test findings to the clinical question. “Within normal limits” is not adequate. The interpretation must say what the findings mean for this patient’s condition.
• Performing and ordering provider: Identity and credentials of the audiologist or physician who performed the test, and the ordering provider if different. Credentialing affects payer coverage, mainly under Medicare.
• Date of service and patient identifiers: Standard claim requirements. These must match the 837P or CMS-1500 submission exactly.

Common billing errors, and how to prevent them

These are the mistakes most likely to generate a denial or audit flag for 92550. Each one has a specific fix that practices can build into their workflow.

• Unbundling 92550 into its component codes on the same day: When both components are performed, bill 92550, not 92567 and 92568 separately. Unbundling triggers NCCI edit denials, so consult the current NCCI tables before splitting a bundled code.
• Omitting modifier -52 for reduced services: If one component of 92550 cannot be completed because of patient factors, append modifier -52 and document the reason. Cerumen impaction and patient refusal are the usual causes. Billing the full code when only one component is performed is overcoding.
• Not enough ICD-10 detail: Pairing 92550 with a nonspecific or laterality-mismatched diagnosis code is a common denial trigger. Use the most specific H-series code the clinical documentation supports.
• Billing 92550 with 92557 without documenting separate medical necessity: These codes can be billed together, but only when each is independently justified. Document the distinct clinical reason for each test before submitting. A clean claim needs documented medical necessity for every service on it.
• Missing acoustic reflex threshold data in the record: CPT Code 92550 covers both components. If the chart documents only the tympanogram, the claim can be challenged on audit as not meeting the code descriptor.
• Incorrect place-of-service code: Non-facility (office) and facility settings have different RVU values for 92550. A mismatched place-of-service code leads to payment at the wrong rate, and may trigger a correction demand.

How Pabau connects audiology documentation to the claim

Audiology billing errors cluster at the handoff between the clinical note and the billing system. A clinician completes both tests and writes up the results. A biller then re-keys the code data into a separate system, and that step is where codes get dropped and modifiers get missed.

Practice management software like Pabau removes the re-keying step. Practices configure audiology service templates that pre-populate 92550, the applicable modifiers, and the most frequently used ICD-10 pairings inside the clinical record. When the clinician finalizes the note, the billing detail travels with it.

Pabau’s claims software for audiology practices then sends the claim through Claim.MD, our US clearinghouse partner. Claim.MD reaches thousands of payers. It supports real-time eligibility verification, 837P electronic claim submission, and electronic remittance advice (ERA) processing.

Practices on this workflow can spot underpaid 92550 claims by comparing what landed against the expected rate. The alternative is finding the shortfall months later, during a manual reconciliation.

Simplify audiology billing from note to claim

Pabau standardizes how codes, modifiers, and diagnosis pairings are captured at the point of documentation, then carries them into the claim. Your billers work from the note instead of rebuilding it.

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Conclusion

Most 92550 denials trace back to a question the chart answers too late. Were both components actually completed? Once the note records that answer, the code, the modifier, and the diagnosis all follow from it.

The bundle pays more than either component alone, and it is also the easier claim to lose. A tympanogram documented without reflex thresholds does not meet the descriptor, whatever the order said. That is worth remembering every time a test is cut short.

Build the check into the workflow rather than into the audit. Book a demo to see how Pabau keeps the code, the modifier, and the diagnosis attached to the audiology note that produced them.

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