CPT code 92537 – Caloric vestibular test with recording

Key takeaways

CPT code 92537 requires bithermal caloric irrigation of both ears with ENG or VNG recording. Missing either element makes the code unbillable.

92537 differs from 92533 in one way that matters: 92533 covers caloric testing without nystagmus recording. Medicare bundles 92533 with no separate payment, though some private payers still pay it.

A recorded test with one irrigation per ear is billed as 92538, and a three-irrigation test is billed as 92537 with modifier 52.

Accepted ICD-10 pairings include H81.x (vestibular disorders), H82 and R42 (dizziness). A diagnosis code that doesn’t support the test is a common cause of medical necessity denials.

Claims management software such as Pabau keeps the signed report, the diagnosis code and the claim in one record, so 92537 claims go out complete.

CPT code 92537: Quick reference

CPT code 92537 reports a bilateral, bithermal caloric vestibular test with ENG or VNG recording, four irrigations in total. It sits in the vestibular function tests with recording range (92537-92549) maintained by the American Medical Association (AMA). The table below covers the details a coder needs before submitting a claim.

What CPT code 92537 covers, and what it excludes

CPT code 92537 covers a full bilateral bithermal caloric vestibular test. Warm and cool water or air is irrigated into each ear canal, four irrigations in total. Electronystagmography (ENG) or videonystagmography (VNG) records the nystagmus response to each one. The slow-phase velocity measurement from each irrigation must be documented in the written report.

What 92537 includes:

• Bithermal caloric irrigation (warm and cool) of both ears
• ENG or VNG recording of nystagmus for each irrigation
• Slow-phase velocity (SPV) measurement and quantitative analysis
• Written interpretation report signed by the interpreting physician or audiologist

What 92537 does not include:

• Unilateral caloric testing (one ear only), reported per irrigation with 92533 instead
• Caloric testing without ENG or VNG recording, which is 92533
• Monothermal testing with one irrigation in each ear, covered by CPT 92538
• Positional nystagmus testing, covered by CPT 92532
• Optokinetic nystagmus testing, covered by CPT 92544
• Rotational chair testing, covered by CPT 92546

How the caloric vestibular test is performed and documented

Proper documentation of the procedure is what separates a clean claim from a denial. Payers audit 92537 on two points. They check that a recording exists for each irrigation, and that both ears received bithermal irrigation.

The standard procedure steps are:

1. Patient preparation: Otoscopy to confirm clear canals, patient positioned supine with head elevated 30 degrees.
2. Cool irrigation: 30°C water or air is irrigated into the right ear canal for 30-40 seconds. The nystagmus response is recorded with ENG electrodes or VNG infrared goggles.
3. Rest period: Minimum five-minute rest between irrigations to allow nystagmus to subside.
4. Warm irrigation: 44°C water or air is irrigated into the right ear, and the response is recorded.
5. Repeat for left ear: Cool then warm irrigation of the left ear, each with recording. This completes the four irrigations required for 92537.
6. Analysis: Slow-phase velocity calculated for each irrigation. Canal paresis (CP) and directional preponderance (DP) computed from the results.
7. Report generation: Written report documenting irrigation temperatures, nystagmus recordings, quantitative SPV values, CP/DP percentages, and clinical interpretation. Interpreting provider signature required.

A clean claim submission for 92537 must be supported by this written report in the patient record. Practices that store only raw ENG tracing without a signed interpretive summary face consistent denials on audit.

CPT 92537 vs 92533: Key differences

CPT 92533 is the caloric vestibular test without ENG or VNG recording, and that one difference also changes how it is paid. Medicare bundles 92533 (payment status B), so it carries no separate payment. Some private payers may still pay it per irrigation.

The practical rule: If the practice performed and recorded a full four-irrigation bithermal test, bill 92537. A recorded test with one irrigation per ear is 92538, and three recorded irrigations are 92537 with modifier 52. If the recording equipment wasn’t used and only clinical observation was documented, 92533 per irrigation may apply. Medicare won’t pay it separately, so check the payer’s policy. Never upcode to 92537 when the ENG or VNG record doesn’t exist.

The decision comes down to two questions, laid out below.

Neighboring vestibular test codes and same-day billing

CPT code 92537 sits within a family of vestibular codes. Understanding which can be billed together on the same date of service is essential for avoiding NCCI bundling denials.

Always verify current National Correct Coding Initiative (NCCI) edits before billing any combination. The AAPC Codify CPT lookup provides bundling indicators for each code pair.

ICD-10 diagnosis codes to pair with CPT code 92537

Pairing CPT code 92537 with the correct ICD-10-CM diagnosis code is the most direct way to satisfy medical necessity requirements. The codes below are commonly accepted by Medicare and commercial payers. When the workup starts from dizziness alone, R42 is usually the first diagnosis on the claim.

Always consult the local coverage determination (LCD) issued by your Medicare Administrative Contractor (MAC) before billing. LCDs vary by jurisdiction. Some MACs restrict coverage of CPT code 92537 to specific diagnosis codes within the H81 range. They may also require documentation that R42 was investigated rather than defaulted to.

Medicare coverage and reimbursement for CPT code 92537

Medicare covers CPT code 92537 under Part B when medical necessity is established and documentation supports the complete bilateral bithermal test with recording. Reimbursement rates are set annually by CMS and vary between facility and non-facility settings. Use the CMS Physician Fee Schedule lookup tool to pull current year rates for your geographic area.

Payment amounts change every January and differ by locality, so this guide doesn’t quote a fixed figure. RVU values can be confirmed with FastRVU’s 2026 RVU lookup. Check the current fee schedule before using any rate in revenue projections.

Incident-to billing for audiologists: Audiologists billing Medicare directly under Part B for 92537 must enroll as Medicare providers. When an audiologist performs and interprets the test in a physician’s office, incident-to rules may apply, depending on whether the physician is present and supervising.

The vestibular codes were restructured in 2016, when 92537 and 92538 replaced the deleted code 92543. Confirm current CMS guidance and your MAC’s LCD rather than relying on billing advice written before that change. The American Speech-Language-Hearing Association (ASHA) publishes Medicare coding guidance for audiologists that is worth reviewing every year.

Prior authorization requirements for 92537

Medicare fee-for-service does not typically require prior authorization for CPT code 92537. Medicare Advantage plans and commercial insurers, however, vary considerably. Prior authorization is more common when 92537 is ordered alongside a full VNG battery that includes multiple additional vestibular codes.

Before scheduling, verify insurance eligibility and authorization requirements for each payer. These steps reduce prior authorization delays.

• Confirm PA requirements during the scheduling call, not the day of the appointment
• Submit clinical notes documenting failed conservative management or the referring physician’s order
• Include the relevant ICD-10 code (H81.x or R42) in the authorization request. A generic request for “vestibular testing” with no diagnosis is more likely to come back for more information
• For urgent cases, request peer-to-peer review with the medical director if the standard authorization is denied

Common claim denial reasons for CPT 92537 and how to avoid them

Most 92537 denials fall into four categories. Recognizing them in advance prevents the majority of claim rework in audiology and ENT billing departments.

Structured denial management workflows help audiology practices track 92537 denials by reason code, spot patterns and prioritize appeals. Tracking common denial codes such as CO-97 and CO-50 shows whether a pattern is systemic or isolated.

A systemic pattern points to the documentation protocol and calls for a billing process change. An isolated one usually reflects a single payer’s policy and calls for an appeal letter with the supporting documentation attached.

Who can bill CPT code 92537?

Audiologists, otolaryngologists (ENT physicians), and neurologists are the providers most commonly performing and billing CPT code 92537. Medicare medical billing rules differ depending on how the service is performed and in whose office it takes place.

• Audiologists: Can enroll as Medicare providers and bill CPT 92537 directly under Part B for covered vestibular testing. The interpreting audiologist must sign the written report. Direct billing requires the audiologist to be independently enrolled, not billing under a physician’s NPI.
• ENT / otolaryngologists: Physicians can bill 92537 when they perform or directly supervise the test and sign the interpretation. The physician’s involvement must be documentable beyond ordering the test.
• Neurologists: May perform vestibular testing in cases where the presenting complaint involves central nervous system etiology. Same documentation requirements apply.
• Non-physician practitioners (NPPs): Nurse practitioners and physician assistants may perform vestibular testing. When they bill under a physician’s NPI in an outpatient setting, Medicare’s incident-to rules apply. Supervision level and enrollment status must be confirmed with the MAC.

How Pabau keeps 92537 claims complete before submission

In many audiology and ENT practices, the ENG or VNG report lives in one system and the claim is built in another. A biller then checks by hand that the signed interpretation, the diagnosis code and the irrigation count all match.

Pabau’s claims management software keeps that documentation and the claim in the same patient record. Through its integration with Claim.MD, Pabau’s US clearinghouse partner, claims go electronically to thousands of US payers. Real-time eligibility checks run before the patient’s appointment, so coverage questions surface before the test.

The result is fewer 92537 claims returned for a missing report or an unsupported diagnosis code. Your billing team spends that time on new claims instead of appeals.

Streamline your vestibular billing workflow

Pabau helps audiology and ENT practices capture ENG/VNG documentation, verify eligibility before appointments, and submit 92537 claims with the right ICD-10 pairings attached. That cuts the back-and-forth that delays payment.

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Conclusion

CPT code 92537 is a well-defined procedure code, but its billing turns on three details. The recording requirement separates it from 92533, the bilateral mandate rules out unilateral tests, and ICD-10 pairing rules vary by MAC. Getting all three right on the first submission is what separates a clean audit trail from a denial backlog.

If your denials cluster on CO-97, start with the signed report. If they cluster on CO-50, start with the diagnosis code. Fixing the one step that fails most often recovers more revenue than reworking claims one at a time.

Book a demo to see how Pabau keeps vestibular test reports, diagnosis codes and claims together for audiology and ENT practices.

Continue your research

Need to understand how claims move through a clearinghouse? Medical claims clearinghouse explained covers how electronic claims are validated, routed, and acknowledged before reaching the payer.

Want to reduce rework on denied vestibular claims? Electronic remittance advice (ERA) guide explains how to read 835 remittance files and identify denial patterns by CARC code.

Building your revenue cycle from scratch? Revenue cycle management overview explains the end-to-end process from eligibility verification through payment posting.

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