Denial code · group CO
CO-96: The service or item is not a covered benefit under the member's plan or the payer's rules
Short answer
CO-96 means the payer decided the service is not a covered benefit: excluded by the plan, not billable by this provider type, or not covered in this setting. The group code matters: CO puts the balance on you, PR-96 puts it on the patient. Confirm the benefit, check for a coding error that made a covered service look non-covered, then send a corrected claim, appeal with the plan document, or write it off.
Look up other codes in the denial code library.
Last reviewed by the Remitwright billing team. Editorial policy
Group CO means contractual obligation: the balance is written off, not billed to the patient. The number is the reason; the two-letter group says who carries the balance.
Remark codes that usually come with CO-96
- N30
- Under the plan's rules, this member does not qualify for the service
- N95
- The payer does not accept this service from a clinician of this type or specialty
- N115
- Medicare's local coverage policy for this service was applied to the claim
Common causes
A plan exclusion
The member's benefit plan does not cover the service at all. Which services are excluded varies by plan and by employer group; one plan covers a service that another with the same payer name excludes. The eligibility response rarely shows this; the benefit summary does.
The payer accepts this code only from certain clinician types
The payer's rules limit a code to certain credentials or specialties. A clinician whose enrolled provider type is not on that list gets N95 with the CO-96. The service may be covered when a different clinician performs it.
The setting is not covered
The code is covered in an office and not by video, or in a facility and not at home, or the place of service on the claim does not match any covered setting for that code. Telehealth expansions and contractions by payer make this a moving target.
A covered service coded as a non-covered one
The wrong code family, an unlisted code where a specific one exists, or a supply code billed separately when the payer bundles it. The service was covered; the claim described something that is not.
No advance notice on file
Some payers assign CO rather than PR when the provider gave no written notice, ahead of the visit, that the service might not be covered. The same denial with a signed notice on file would have been the patient's responsibility.
How to fix it and resubmit
- 1
Check the group code before anything else
CO-96 means the payer expects you to absorb it; PR-96 means the patient owes it. If the payer's own rules make the member responsible and it still sent CO, ask for reprocessing under PR with the policy reference.
- 2
Verify the benefit for that service, not just eligibility
Pull the plan's benefit summary or call with the code and place of service. If the plan covers the service, the denial is a coding or setting problem and the next step is a corrected claim. If it is excluded, the question becomes who pays.
- 3
Correct the claim when the code or setting is wrong
Choose the code the documentation supports, fix the place of service, or remove a separately billed supply the payer bundles, and resubmit with frequency code 7. For N95, check whether the service should be billed under a supervising clinician's credential where the payer allows it.
- 4
Appeal with the plan document when the payer is wrong
If the benefit summary or certificate of coverage lists the service as covered, attach that page to the appeal. Members can request their plan documents, and a member appeal often moves faster than a provider appeal on a benefit question.
- 5
Move the balance correctly when the service is excluded
If the patient signed a written notice before the service and the plan allows member billing for excluded services, ask the payer to reprocess the line under PR, then bill the patient under the plan's rules once the remit shows PR. Without a notice, write it off and fix the intake process that let the service happen without one.
How to prevent it
- Benefit verification at the service level for non-routine procedures, supplies and new service lines, recorded with the date and the payer representative's reference
- A written notice process for services a plan may exclude, with the signed form on file before the service is performed
- A provider-type billing matrix per payer, so a code is scheduled with a clinician whose credential the payer accepts for it
- A place of service and telehealth coverage table per payer, reviewed when the payer updates its telehealth or site of service policy
A CO-96 on an adjunct therapy in a chiropractic office
A chiropractic office adds a mechanical traction code to its visits and bills it alongside manipulation. One commercial plan pays the manipulation and denies the traction CO-96 with N30. The plan's chiropractic benefit covers manipulation only. No written notice was signed, and the office's participation agreement does not allow billing the member for a non-covered service without one. The office writes off the traction charges, then adds a benefit check for adjunct therapies at the first visit and a written notice for patients whose plans exclude them. This is a hypothetical example.
Official text: the X12 claim adjustment reason code list. The meaning above is our paraphrase for billers; the list is the authority.
FAQ
Questions about CO-96
What is the difference between CO-96 and PR-96?
Is CO-96 the same as a medical necessity denial?
The service is listed as covered in the plan summary. Why did it deny?
Can I bill the patient after a CO-96?
Should I appeal a CO-96?
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