TMS (Transcranial Magnetic Stimulation) therapy is a vital treatment option for many patients, particularly those suffering from major depression. However, healthcare providers often face challenges with TMS claim denials. These denials can hurt a practice’s revenue and make it harder to help patients.
The top reasons for TMS claim denials are: Lack of medical necessity documentation, missing prior authorization, Incorrect coding or billing errors, and calling it a non-covered service.
Fixing TMS Therapy Insurance Denial is key to keeping your practice financially stable. When you understand the reasons claims are denied, you can fix problems, secure payment, and take proactive steps to prevent future issues.

1. Lack of Medical Necessity Documentation
One of the most frequent reasons for TMS claim denials is insufficient documentation of medical necessity. Insurance companies require detailed records to prove that TMS treatment is necessary for the patient’s condition. Comprehensive medical records, including a thorough treatment history and documentation of all previous treatments, are essential to demonstrate eligibility and support the claim. If the documentation is lacking or not comprehensive enough, the claim can be denied.
How to Resolve It
- Ensure Proper Documentation: Always document the patient’s history, diagnosis, and treatment plan. Include details about the patient’s failure to respond to other treatments (like medications or psychotherapy) before recommending TMS therapy.
- Use Clear and Concise Language: When explaining the necessity of TMS, avoid vague statements. Be specific about why traditional methods have failed and why TMS is the appropriate next step.
- Provide Updated Reports: Always include updated progress notes, psychiatric evaluations, and any other relevant assessments that show the patient’s condition has been thoroughly evaluated.
2. Failure to Obtain Pre-Authorization
Many insurance companies require pre-authorization before TMS treatment can be administered. If pre-authorization is not obtained or is incorrectly handled, claims will often be denied. Insurance approval for TMS therapy is contingent on meeting specific eligibility criteria set by the insurance provider, such as diagnosis, treatment history, and severity of the condition. This is particularly common for newer treatments like TMS.
How to Resolve It:
- Check Insurance Requirements: Before starting TMS treatment, confirm the specific pre-authorization requirements of the patient’s insurance provider. This can typically be done via the insurance company’s website or by calling their customer service.
- Submit Authorization RequestsPromptly: Submit your pre-authorization request as early as possible to avoid delays. Include all necessary documentation, such as the patient’s medical history, diagnosis, and treatment plan.
- Follow-up: After submitting the pre-authorization request, follow up to ensure it’s been processed. Document the follow-up to create a clear record in case of future disputes.
3. Incorrect Coding or Billing Errors
Inaccurate CPT (Current Procedural Terminology) or ICD-10 coding is a major reason for TMS claim denials. Payers can reject claims if the codes used don’t accurately reflect the procedure or the diagnosis.
How to Resolve It
- Use Correct CPT Codes: For TMS, the standard CPT codes are 90867, 90868, and 90869 for the initial treatment, maintenance, and subsequent sessions, respectively. Double-check that you are using the correct code based on the treatment being provided.
- Accurate ICD-10 Codes: TMS is most commonly used to treat Major Depressive Disorder (MDD), but it may also be used for other conditions. Ensure that the ICD-10 code(s) reflect the diagnosis that justifies the TMS treatment. For example, F32.2 (Major depressive disorder, single episode, severe without psychotic features) and F33.2 (Major depressive disorder, recurrent severe without psychotic features) are common codes.
- Review Code Pairing Guidelines: Sometimes certain codes cannot be paired together, which can result in a denial. Be aware of which combinations of diagnosis and procedure codes are accepted by different insurance companies.

4. Insufficient or Incomplete Patient Information
If the TMS claim lacks complete patient details, including demographic information or insurance policy numbers, the claim may be automatically denied. Missing or incorrect data can delay the payment process, as insurance companies will need additional information to process the claim.
How to Resolve It
- Verify Patient Information: Always verify the patient’s information before submitting claims. This includes checking their insurance details, address, date of birth, and policy number.
- Confirm Insurance Coverage: Before administering TMS, confirm that the patient’s insurance covers the procedure. Some plans may have exclusions or limitations, so it’s crucial to confirm coverage beforehand.
- Complete the Claims Form Accurately: Double-check that the patient’s information is filled out accurately on the claim form. Even a small mistake can result in a denial or delay.
5. Exceeding the Coverage Limits
Some insurance plans have strict limits on the number of TMS sessions covered per year. If a patient exceeds this limit, the insurance company may deny the claim.
How to Resolve It
- Review Coverage Limits: Before starting treatment, make sure you understand the insurance company’s specific limits on TMS sessions. Some plans may cover only a certain number of sessions per year, and exceeding that limit will result in denials.
- Obtain Prior Authorization for Additional Sessions: If additional sessions are required beyond the limit, contact the insurance company for authorization. In some cases, you may need to submit additional documentation to support the need for further sessions.
- Inform the Patient: Be upfront with the patient about any potential out-of-pocket costs if their insurance doesn’t cover the additional sessions. This will help avoid confusion and frustration later on.
6. Non-Covered Services
Some insurance plans may consider TMS therapy as an experimental or non-covered service, particularly in cases where the patient is receiving treatment for conditions not explicitly covered in the plan.
How to Resolve It
- Check the Insurance Policy: Always review the patient’s insurance policy to determine whether TMS is covered. Some insurance providers might exclude TMS for certain diagnoses, such as anxiety or post-traumatic stress disorder (PTSD).
- Appeal Denials: If the claim is denied due to non-coverage, it’s essential to appeal the decision. In the appeal, provide supporting evidence that demonstrates the clinical efficacy of TMS, such as studies or expert recommendations that show TMS is an accepted treatment for the patient’s condition.
- Consider Alternative Funding Sources: If insurance coverage is not available, discuss out-of-pocket options with the patient. Some practices offer payment plans or financing options to make the treatment more affordable.

7. Patient Eligibility Issues
Claims can be denied if the patient’s insurance coverage is not active or if there is a mismatch in eligibility. This could happen if the patient’s policy has lapsed, or if they switched plans without updating the information.
How to Resolve It
- Verify Eligibility Before Treatment: Always verify the patient’s insurance eligibility before starting any TMS treatment. This can typically be done online through the insurance company’s portal or by calling their customer service line.
- Update Insurance Information: If the patient changes their insurance provider, make sure that the updated insurance information is recorded in your system.
- Check for Coordination of Benefits (COB): If the patient has multiple insurance plans, confirm which one is primary and which is secondary, and submit claims accordingly.
8. Late Submission of Claims
Each insurance company has a deadline for submitting claims. If you fail to submit your TMS claims within the allowed timeframe, the claim will likely be denied, no matter how valid it is.
How to Resolve It
- Submit Claims Promptly: Ensure that claims are submitted within the insurance company’s guidelines. Keep track of deadlines and set reminders for when claims are due.
- Track Your Claims: Use a billing software system that tracks claim status. This can help ensure that claims are submitted on time and allow you to follow up if necessary.
- Timely Appeal: If a claim is denied due to a late submission, check with the insurance company to see if they have any leeway for reconsideration. Some insurers may accept late submissions with proper justification.
Conclusion
TMS claim denials create significant financial and operational challenges for mental health practices if not managed correctly. Most denials are preventable and stem from documentation deficiencies, authorization lapses, coding inaccuracies, or payer coverage limitations.
Addressing these issues requires consistent processes, payer-specific knowledge, and close attention to billing details. Working with an experienced TMS billing partner, such as FC Billing, can help practices improve claim accuracy, reduce denials, and improve reimbursement outcomes for TMS services.
