Audiology Billing 2026: AB Modifier, New Codes and Denial Prevention

By Yagnesh Dave  ·  September 2026  ·  14 min read

Audiology billing runs on a smaller code set than most specialties, which makes it easy to assume it's simple. It isn't: it's precise in a way that punishes small mistakes. One modifier decides whether Medicare pays a diagnostic claim directly to the audiologist or denies it outright. One frequency limit, applied per patient per year rather than per visit, quietly blocks claims that look perfectly correct on their face. And in 2026, an entire category of codes changed structurally in a way that's easy to misread as a coverage expansion when it's actually the opposite.

This guide covers the direct access rule that's been reshaping how audiologists bill since 2023, the 2026 hearing device code overhaul, the vestibular testing bundling rules that generate quiet, recurring denials, and the real enforcement cases that show what happens when documentation doesn't match what was actually billed. This isn't a paperwork detail, it's a revenue line: practices that let this slide leave money uncollected every year.

Diagnostic Audiology CPT Codes

Diagnostic audiology billing is built around a handful of core test families: pure tone and speech audiometry, vestibular and balance testing, tympanometry, otoacoustic emissions, and evoked potentials.

The AB Modifier: Direct Access Since 2023, Expanded in 2024

Here's a correction worth making explicitly, because it's easy to get wrong: Medicare's audiology direct access rule is not a 2024 policy. It was finalized in the CY2023 Medicare Physician Fee Schedule, became regulation effective January 1, 2023, and its claims-processing edits went live July 1, 2023. What did happen in 2024 was an expansion, CMS added two more codes to the eligible list that year.

The rule allows audiologists to bill Medicare directly, using modifier AB, for certain non-acute hearing assessment services without requiring a physician or nonphysician practitioner order first. The original list covered 36 CPT codes; the 2024 addition of osseointegrated device programming codes 92622 and 92623 brought the total to 38. Vestibular and balance testing codes are explicitly excluded; don't bill those with AB, CMS will return the claim.

The 2026 Hearing Device Code Overhaul: Not a Coverage Expansion

This is the change most likely to cause confusion on your billing team this year. Effective January 1, 2026, CPT deleted the hearing aid service codes 92590 through 92595, codes that had been in continuous use since 1993, and replaced them with 12 new codes across five categories: candidacy evaluation, hearing aid selection, fitting and follow-up, verification, and assistive device services like FM/DM systems.

It would be reasonable to look at 12 new specific codes and assume Medicare finally started paying for hearing aid services. It didn't. These new codes currently have no assigned RVUs and remain non-payable under Medicare, because the statutory hearing aid exclusion under Section 1862(a)(7) of the Social Security Act hasn't changed. The codes exist for billing transparency and for commercial payer and Medicaid use where coverage does exist. Bill Medicare with these codes expecting reimbursement, and you'll get a denial that has nothing to do with your documentation and everything to do with a benefit category exclusion that predates the code changes by decades.

OIG Enforcement: What Actual Audiology Fraud Cases Look Like

Audiology doesn't have the same volume of OIG Work Plan activity as larger specialties, but the enforcement cases that do exist are specific and instructive. Hearing Screening Associates, an Illinois provider, agreed to pay just over $4 million in April 2023 after self-disclosing that it billed CPT 92585, comprehensive auditory evoked potentials, for services where audiologists never actually read, interpreted, or signed the automated test results. In other words, the claim represented physician-level interpretation work that simply never happened.

An older case, Towson University's Speech Language & Hearing Center, paid $10,000 in 2015 for submitting audiology claims under incorrect NPI numbers that didn't identify the audiologist who actually performed the service. That case is worth remembering specifically in the context of the AB modifier rule: because AB claims require the audiologist to personally furnish and bill under their own NPI, attribution accuracy matters more under the current rules than it did when that settlement happened.

Common Audiology Denial Patterns and Fixes

Frequently Asked Questions About Audiology Billing 2026

What is the AB modifier for audiology direct access?

Modifier AB allows an audiologist to bill Medicare directly for certain non-acute hearing assessment services without a physician or nonphysician practitioner order, under a rule finalized in the CY2023 Medicare Physician Fee Schedule and effective for claims processing since July 1, 2023. It applies to a specific list of CPT codes published by CMS, excludes vestibular and balance testing codes entirely, and can be used once every 12 months per patient. Billing one eligible code with modifier AB blocks all other AB-eligible codes for that same patient for the next 12 months, regardless of how many were performed on the same date.

Does Medicare cover hearing aids?

No. Hearing aids themselves remain statutorily excluded from traditional Medicare Part B coverage under Section 1862(a)(7) of the Social Security Act, and this has not changed despite the complete overhaul of hearing device billing codes effective January 1, 2026. The new codes exist for billing transparency and for commercial payer and Medicaid use, not because Medicare now reimburses hearing aids. Diagnostic audiology services that assess hearing loss remain separately covered as diagnostic tests under Part B, which is a distinct benefit category from the hearing aid device itself.

What changed in audiology CPT codes for 2026?

Effective January 1, 2026, CPT deleted the legacy hearing aid service codes 92590 through 92595, which had been in use since 1993, and replaced them with 12 new codes across five categories: candidacy evaluation, hearing aid selection, fitting and follow-up, verification, and assistive device services. These new codes currently carry no assigned Medicare RVUs and remain non-payable under Medicare due to the statutory hearing aid exclusion. They apply only to air-conduction devices; implantable device programming codes such as 92601 through 92604 are unchanged.

See how Rcmaxis handles the full scope of Audiology billing on our Audiology billing services page.