CO-55Contractual ObligationMedical Necessity
CO-55 Denial Code: Experimental/investigational procedure
The procedure/treatment/drug is deemed experimental or investigational by the payer.
Why CO-55 happens
- ●New technology or off-label use not yet in payer policy
- ●Unlisted code without supporting literature
How to fix a CO-55 denial
- 1
Review the payer's medical policy for the service
- 2
Appeal with peer-reviewed evidence, FDA status, and specialty society guidelines
- 3
Use the payer's exception/IRO process for strong cases
How to prevent it
Check medical policy before scheduling novel procedures; obtain waivers.
Drowning in CO-55 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.