CO-228Contractual ObligationCoordination of Benefits
CO-228 Denial Code: Requested info not supplied to previous payer
Denied because someone — you, another provider, or the subscriber — never gave a PREVIOUS payer information it requested, blocking this payer's adjudication.
Why CO-228 happens
- ●Primary payer's development request ignored, so the secondary can't finalize
How to fix a CO-228 denial
- 1
Resolve the underlying request with the prior payer, get their final adjudication, then rebill this payer
How to prevent it
Close every payer information request — they resurface downstream.
Drowning in CO-228 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.