As mental health practices expand Transcranial Magnetic Stimulation (TMS) services, billing requirements have become more complex. For the 2025–26 period, payer policy updates, stricter prior authorization rules, defined session limits, and tighter documentation standards are changing how insurers evaluate and reimburse TMS claims.
Our Multi-state TMS billing audits identify several recurring issues that consistently lead to claim denials. The most frequent problems include missing or expired prior authorizations, use of incorrect CPT or diagnosis codes, and clinical documentation that is incomplete or inconsistent with payer guidelines. These issues often result in delayed reimbursement, denied claims, and avoidable revenue loss.
This guide reviews key TMS billing trends for 2025–26, including recent payer policy changes, insurer-specific patterns, and the most common billing errors identified through our internal audits. Its purpose is to help TMS clinics align with current payer requirements, submit accurate claims on the first submission, and reduce denials, rework, and payment delays.
Major Cause of TMS Claim Denials: Authorization Errors
Pre-authorization related issues remain the number one reason for TMS claim denials across payers.
Common Authorization Problems
- Missing authorization entirely
- Services billed outside the authorized date range
- Insurance portals stating “authorization not required,” but claims are later denied
Best Practice for Authorization Verification
Do not rely solely on payer portals. Always complete the following steps:
- Call the insurance company and request the Pre-Authorization Department
- Confirm you are speaking with the correct department representative
- Document the call thoroughly
Information to Have Ready When Calling
- Patient ID
- CPT codes
- Provider NPI
- Tax ID
- Place of Service
If a payer confirms authorization is not required, closely monitor the first few claims to ensure payment.
Always Create an Authorization Trail
- Submit authorization requests via fax or payer portal
- Maintain electronic documentation for audit protection
What to Do After Submitting a TMS Authorization Request
Authorizations are typically generated within a few business days. Delivery methods vary by payer.
Where Authorizations Are Sent
- Insurance portals
- Fax to provider’s office
- Mailed approval letters
Operational Best Practices
- Check insurance portals daily
- Monitor fax lines for authorizations, EOBs, payer letters, and card payments
- Review physical mail daily and scan approvals into the patient record immediately
- Notify providers and TMS technicians promptly so scheduling is not delayed
Authorization Details to Review Before Starting TMS Treatment
Physicians and TMS technicians must confirm authorization accuracy prior to treatment initiation.
Required Authorization Checks
- Correct patient demographics
- Approved CPT codes
- Approved diagnosis codes
- Authorized date range
- Total number of allowed units
CPT Unit Verification Checklist
Confirm whether authorization includes:
- 1 unit of CPT 90867 (Initial Mapping)
- 34 to 36 units of CPT 90868 (TMS Treatment Sessions)
- 1 unit of CPT 90869 (Remapping, if applicable)
Note: Some payers do not reimburse CPT 90869. Never bill outside the authorized date range. Extensions or backdated requests must be completed before treatment begins.
Common TMS Billing Mistakes That Lead to Denials
Many TMS denials are caused by avoidable documentation and timing errors. Small mistakes in encounter finalization, session tracking, or dates of service can quickly lead to denied or delayed payments.
- Encounters not finalized on time: TMS encounters should be finalized within 24 hours. Delays increase the risk of documentation errors, missed billing corrections, and potential revenue loss.
- Incorrect session number documentation: Duplicate session numbers can cause duplicate billing denials, while skipped numbers may result in missed or underpaid claims.
- Incorrect date of service: Incorrect dates in medical records may trigger claim denials or post-payment refund requests.
Accurate and timely documentation is essential to protect TMS revenue and reduce denials.
Can You Bill More Than One TMS Session Per Day?
No. You cannot bill more than one TMS session per day. If you perform:
- CPT 90867 (Initial Mapping), or
- CPT 90869 (Remapping)
Do not bill any additional TMS services that day.
Billing Double TMS Sessions (Two Units of 90868)
Billing two units of 90868 on the same day is payer-specific.
Payers That Have Paid Double TMS Sessions
- Medicare
- Cigna
Most other payers deny double sessions. Always verify payer policy before treatment to avoid write-offs.
Billing E/M Services With TMS (90868 + 99213 or 99214)
E/M services may be billed on the same day as TMS treatment, subject to payer limits.
Typical Payer Allowance
- 4 to 5 E/M visits during the 34 to 36-session TMS course
- Frequency limits vary by payer
Payers That Have Paid E/M + TMS Same Day
- Cigna
- BCBS FEP
- Kaiser
- UnitedHealthcare
- UMR
- Medica
- Medicare
- Tricare
- ComPsych
- SelectHealth
Payers That Commonly Deny E/M With TMS
- Aetna
- Several BCBS plans
- Humana
Always review payer-specific E/M frequency policies before submitting claims.
Diagnosis Coding Requirements for TMS Billing
Diagnosis must support medical necessity and align with payer policy.Commonly Accepted Diagnoses:
- F33.2 – Major Depressive Disorder, recurrent, severe
- F32.2 – Major Depressive Disorder, single episode, severe
- F42.9 – Obsessive Compulsive Disorder
If using F41.1 (Generalized Anxiety Disorder), most payers require an additional primary diagnosis such as treatment-resistant depression.
Conclusion
Successful TMS billing depends on preparation, payer knowledge, and consistent verification. It’s essential to follow payer-specific rules for frequency limits, E/M billing, same-day (double) TMS, and most importantly, authorization accuracy. Staying diligent protects your revenue and helps prevent costly denials and billing headaches.
If you need support reviewing denial trends, payer policies, or optimizing your internal TMS workflows, feel free to reach out. We offer comprehensive TMS Billing Support to keep your practice compliant and profitable.
