CARC 197

Definition

CARC 197 is one of the standard X12 claim adjustment reason codes. X12 maintains that list and states that the codes exist to describe why a claim or service line was paid differently than it was billed (see the X12 claim adjustment reason code list). It is the code payers use for the prior-approval family of denials, and what triggers it is set by the individual plan, not by a national rule: which services need approval, how far ahead, and whether the plan will consider a request made after the service are all plan-policy and contract questions. Three different fact patterns arrive under the same code and they do not resolve the same way — approval was never requested; approval exists but was not reported on the claim or does not match what was billed; or approval existed and had expired, been exhausted, or covered a different date, site or code. One federal rule is worth knowing for Medicare Advantage: under 42 CFR 422.138, where an MA organization has approved an item or service through prior authorization, it “may not deny coverage later on the basis of lack of medical necessity and may not reopen such a decision for any reason except for good cause”.

Common Causes of CARC 197

1. A service subject to the plan’s prior-approval requirement — advanced imaging, an inpatient admission, a surgery, a specialty drug, behavioral-health visits past a plan threshold, or DME — was performed without that approval.
2. Approval was granted, but the authorization number was missing from the claim, or the code, units, site or rendering provider billed did not match what the plan approved.
3. Approval existed but had expired, had been exhausted, or covered a different date span than the date of service.
4. The plan’s approval requirement was not identified at scheduling or check-in.

How to Prevent CARC 197 Denials

1. Build a plan-specific prior-approval requirement matrix into scheduling so approval needs are flagged before the service is rendered.
2. Use real-time eligibility (270/271) checks, which often return the plan’s authorization requirements.
3. Capture the authorization number with its approved code, site and date span, and verify all of it against the claim before submission.

Common Misconceptions

A CARC 197 is not automatically a write-off, and it is not automatically the patient’s balance either. Some plans will review a post-service authorization request or a peer-to-peer discussion for urgent and emergent care; whether yours will, and within what period, is set by that plan’s policy and your contract rather than by a general rule. The route to patient responsibility is the part most often got wrong. The Advance Beneficiary Notice of Noncoverage (Form CMS-R-131) is a Fee-for-Service Medicare instrument — CMS lists it under FFS on its Beneficiary Notices Initiative page, where Medicare Advantage denials instead use the Integrated Denial Notice (Form CMS-10003). Commercial plans set their own notice and hold-harmless terms by contract. Confirm what the applicable plan rules and your agreement allow before billing a patient for a 197.

Related Terms