CO-13Contractual ObligationEligibility
CO-13 Denial Code: Date of death precedes date of service
The date of death precedes the date of service.
Why CO-13 happens
- ●Wrong DOS keyed on the claim
- ●Payer has an incorrect date of death on file
- ●Identity mix-up between patients
How to fix a CO-13 denial
- 1
Verify the actual DOS from the medical record
- 2
If the payer's death date is wrong, have the patient/family correct it with SSA or the plan
- 3
Resubmit with documentation
How to prevent it
Double-check DOS entry; act quickly on these — they often signal identity errors.
Drowning in CO-13 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.