How to Appeal MA91 Denial: Alert: This determination is the result of a post-payment review
The payment adjustment is the result of a post-payment medical review, not the initial adjudication. This guide explains what it means, why it happens, and exactly how to build a winning appeal.
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What Does MA91 Mean?
The payment adjustment is the result of a post-payment medical review, not the initial adjudication.
Commonly seen in:
Step-by-Step Appeal Guide for MA91
- 1
Review the denial remittance advice to identify the exact missing or incorrect information
- 2
Call the payer to confirm precisely what documentation or data is needed
- 3
Gather and organize all requested records: clinical notes, referrals, test results
- 4
Prepare a cover letter referencing the specific information being provided
- 5
Submit with confirmation (fax receipt or portal upload confirmation number)
Counter-Arguments to Use in Your Appeal
These are the strongest arguments medical billing professionals use to overturn MA91 denials.
Request the specific documentation deficiency identified in the review
Provide additional clinical documentation that was not in the medical record
File a formal appeal within the required timeframe (120 days for Medicare)
Engage a coding expert or healthcare attorney if the overpayment demand is significant
Regulations and Guidelines to Cite
Citing specific regulations strengthens your appeal and demonstrates you know your rights.
Expert Tip for MA91 Appeals
Post-payment review results can be appealed. Success rates at ALJ level are often higher than contractor levels. Consider the cost-benefit before deciding whether to appeal.
Frequently Asked Questions
What is a MA91 denial code?
The payment adjustment is the result of a post-payment medical review, not the initial adjudication.
Can I appeal a MA91 denial?
Yes. All insurance denials are appealable. Follow the step-by-step guide above and submit your appeal before the payer's deadline, typically 180 days from the denial date.
What documentation do I need to appeal MA91?
For a MA91 denial, you typically need: the original denial letter/EOB, clinical documentation supporting the service, any prior authorization records, and a cover letter citing the relevant regulations listed above. The specific documents depend on why the denial was issued.
How long does a MA91 appeal take?
Most payers are required to process standard appeals within 30–60 days. Expedited appeals (for urgent care) must be decided within 72 hours. Under ERISA, group health plans must provide an appeal decision within 60 days for pre-service and 60 days for post-service claims.
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