Speech Therapy Billing in 2027: New Codes, Common Denials, and How to Fix Them

The new 2027 SLP treatment codes

Each treatment type now has a base code for the first 30 minutes and an add-on code for each additional 15 minutes:

• 92654 / 92655 — Fluency treatment
• 92656 / 92657 — Speech sound treatment
• 92658 / 92659 — Language treatment
• 92660 / 92661 — Speech sound and language treatment
• 92662 / 92663 — Voice treatment
• 92508 — Group speech-language treatment (retained)
• 92526 — Treatment of swallowing dysfunction and/or oral function for feeding

Evaluation codes

• 92521 — Evaluation of speech fluency
• 92522 — Evaluation of speech sound production
• 92523 — Evaluation of speech sound production with language comprehension and expression
• 92524 — Behavioral and qualitative analysis of voice and resonance

Timed codes change the math

Because the new treatment codes are timed, documentation must show treatment minutes, and the add-on code is billed only when time beyond the first 30 minutes supports it.

Common early mistakes: billing an add-on without its base code, billing add-on units the documented minutes don't support, and choosing a single-area code when the session addressed both speech sound and language.

CMS has also proposed a Medicare G code, GSLPP, for pediatric speech-language treatment. Confirm each payer's adoption date and authorization rules, since existing authorizations may have been written under the old code.

Pediatric speech and Medicaid

Pediatric speech practices often depend on Medicaid and managed Medicaid. Authorizations, re-authorizations, and plan changes happen constantly. When an authorization lapses, visits keep happening — but payment doesn't.

The fix is a reliable authorization and eligibility process with clear handoffs between your front desk and billing team. Your practice owns that front-end workflow unless separately scoped eligibility and authorization support is part of your agreement.

Denials SLP practices see most

• Authorization missing, expired, visits exhausted, or written for a retired code
• Add-on units not supported by documented minutes
• Evaluation code doesn't match documentation
• Diagnosis codes not supporting medical necessity
• Patient eligibility changed mid-month

An SLP billing handoff checklist for practice owners

Make these checks part of the practice’s existing workflow rather than waiting for a denial to reveal a missed step. Confirm requirements with each payer; code and policy guidance should be reviewed by a qualified billing or coding professional.

• Have your administrative team confirm coverage, visit limits, and any evaluation or treatment authorization before care starts; assign someone to track renewal dates.
• Ask clinicians to record treatment minutes and keep signed notes aligned with the services provided.
• Make sure your EMR templates and fee schedules use the 2027 treatment codes.
• Review denied claims and unpaid balances with the billing team regularly, then trace repeat problems back to intake, authorization tracking, or documentation.