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RARC
M91
RARC
Authorization
Quick Facts
Code
M91
Type
RARC
Category
Authorization
Status
Active
What Does This Code Mean?
Lab procedures with different CLIA certification numbers must be billed on separate claims.
Common Causes
- Authorization/referral not obtained before the service
- Authorization obtained but for different codes, units, or dates than billed
- Authorization expired before the service date
Recommended Next Steps
- Check the payer portal for an authorization on file and compare it exactly to what was billed
- Request a retroactive authorization if the payer allows it
- Appeal with clinical documentation if retro-authorization is denied
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Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.