CO-50
Non-covered because not deemed a medical necessity by the payer
What This Code Means
The payer determined the service does not meet its medical necessity criteria for the diagnosis billed.
Common Causes
- ICD-10 code doesn't support the CPT code billed
- Local Coverage Determination (LCD) criteria not met
- Documentation doesn't establish medical necessity
- Screening vs. diagnostic service coded incorrectly
How to Resolve or Appeal
- Review the payer's LCD/NCD for the specific CPT code
- Confirm diagnosis coding supports the service performed
- Request medical records review or file a redetermination appeal
- Consider an Advance Beneficiary Notice (ABN) workflow going forward
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.