Speech Therapy Billing, Credentialing

Speech-language pathology bills differently from most outpatient care. Evaluations are split into separate codes by what was assessed, the main treatment code is billed per session instead of by time, and Medicare requires a physician-certified plan of care before it will pay for any therapy. A practice that gets those rules right gets paid for its sessions. One that doesn’t sees denials months after the visits happened.

Credentialing has its own catch. Medicare enrolls SLPs in private practice, but it doesn’t recognize speech-language pathology assistants at all, so who delivered the session matters as much as what was billed.

Key Takeaways

Speech Therapy CPT Codes

Speech therapy coding starts with the evaluation. Instead of one evaluation code, CPT splits evaluations by what the SLP assessed, and the code has to match the documented assessment. Billing 92523 when only speech sound production was evaluated is a common reason for denials and audit findings.

Most treatment bills under 92507, which covers individual treatment of speech, language, voice, communication, or auditory processing disorders. It’s an untimed code, billed once per day regardless of whether the session ran 30 minutes or 60. Cognitive rehabilitation is the exception: 97129 and 97130 bill in 15-minute units, so the documented time decides how many units can be billed.

Medicare Rules for Speech Therapy

Medicare covers outpatient speech therapy under Part B when it’s medically necessary and delivered under a plan of care. The plan of care has to be certified by a physician or nonphysician practitioner, generally within 30 days of the evaluation, and recertified at least every 90 days. A progress report is due at least once every 10 treatment visits. Missing any of these gives the MAC grounds to deny every claim in the gap.

Every speech therapy claim to Medicare carries the GN modifier, which identifies the service as delivered under a speech-language pathology plan of care. Many commercial plans and Medicaid programs require it too.

The hard therapy cap was repealed in 2018. In its place, Medicare sets an annual dollar threshold that speech therapy shares with physical therapy. Claims above that threshold need the KX modifier, which attests that the services are medically necessary and that the documentation supports them. Spending above a higher threshold can trigger targeted medical review. The ASHA reimbursement resources publish the current year’s amounts.

Documentation That Supports Medical Necessity

Speech therapy claims are denied for documentation far more often than for coding. Payers want to see a measurable baseline, functional goals tied to daily life (ordering a meal, following instructions at work, swallowing safely), and objective progress toward those goals. A note that says “patient tolerated session well” doesn’t show progress. A note that says “patient produced /s/ in conversational speech with 70% accuracy, up from 40%” does.

Maintenance therapy is covered when the SLP’s skill is required to keep the patient from declining, which matters for patients with progressive conditions such as Parkinson’s disease or ALS. The documentation has to explain why the services need a skilled clinician rather than a caregiver or a home program.

Pediatric Speech Therapy and Medicaid

Medicaid covers a large share of pediatric speech therapy. Under the EPSDT benefit, state Medicaid programs have to cover medically necessary therapy for children under 21, even when the adult benefit is limited. Prior authorization requirements, visit limits, and approved diagnosis codes vary by state and by Medicaid managed care plan, so authorizations have to be checked plan by plan.

Commercial plans add their own limits, such as annual visit caps or exclusions for developmental delays that aren’t tied to a medical diagnosis. Checking those benefits before the evaluation avoids sessions the family ends up paying for.

Speech-Language Pathologist Credentialing

Licensure and certification

Payers verify a state SLP license and, for most networks, the Certificate of Clinical Competence (CCC-SLP) from the American Speech-Language-Hearing Association. Clinical fellows who haven’t finished their supervised year can’t be credentialed independently with most payers, so their services have to be billed according to each payer’s supervision rules.

Medicare enrollment

SLPs in private practice enroll with Medicare individually through PECOS and reassign benefits to their group. Speech-language pathology assistants can’t enroll, and Medicare doesn’t pay for services they deliver, even under supervision. Some Medicaid programs and commercial plans do recognize SLPAs, so the rule has to be checked payer by payer.

Commercial and Medicaid networks

Each commercial and Medicaid managed care plan credentials SLPs separately, typically through a CAQH ProView profile. Until a plan approves the clinician, their sessions can’t be billed to that plan, which is why you can’t bill what you can’t credential. Practices adding a new SLP should start applications as soon as the hire is signed.

Speech Therapy Billing FAQs

Why Speech Therapists Choose Medwave for Billing & Credentialing

Medwave handles speech therapy billing, credentialing, and payer contracting under one team. We match evaluation codes to the documented assessment, track plan of care certification and progress report dates, and apply the GN and KX modifiers where they’re required. That’s how we hold a 98% clean claim rate.

On credentialing, we enroll SLPs with Medicare, Medicaid, and commercial plans, track CCC-SLP and license renewals, and handle the payer-by-payer rules for clinical fellows and SLPAs, with a 60-day average turnaround.

Contact Medwave below to see how we can support your speech therapy practice.