CARC 197 — Precertification / authorization absent (prior auth denial)

CARC 197 — "Precertification/authorization/notification/pre-treatment absent"#

Official meaning: CARC 197 reads "Precertification/authorization/notification/pre-treatment absent." It is the canonical prior-authorization denial.

What it means in practice: the service required prior authorization (precertification) from the payer, and either no authorization was obtained, the auth number was not on the claim, the authorization had expired, or the authorized service/units did not match what was billed.

Group code: usually CO-197 (contractual obligation — the provider failed to meet a contract requirement), which means it cannot be balance-billed to the patient when the provider was responsible for obtaining the auth.

How to resolve and appeal CARC 197:

1. Check whether an authorization actually exists. If one was obtained but the number was simply omitted, this is a clerical fix — add the auth number and submit a corrected claim.
2. If the authorization exists but details mismatch (wrong CPT, wrong units, wrong date span, wrong rendering provider), correct the claim to match the auth, or contact the payer to update the auth.
3. If no authorization was obtained, file an appeal requesting a retrospective / retroactive authorization. Many payers grant retro-auth for urgent/emergent care or when the patient's eligibility was not knowable in advance. Provide clinical documentation of medical necessity and any reason the auth could not be obtained beforehand (e.g., emergency).
4. For emergencies, cite the prudent-layperson standard — emergency services generally cannot be denied solely for lack of prior auth.
5. Track the appeal deadline. Auth-related appeals have strict timely-filing windows that vary by payer.

CARC 197 is one of the most preventable and most expensive denial categories. The structural fix in revenue cycle management is front-end eligibility + prior-authorization automation: verifying auth requirements and capturing the auth number *before* the service is rendered.