CARC 198: Precertification/notification/authorization/pre-treatment exceeded.

CARC 198 appears on the 835 ERA (Electronic Remittance Advice) that the payer returns after claim adjudication. It explains a reduction, denial, or payment adjustment to your billing team. For your practice, the question is workflow: identify the pattern, route the denial to the right resolution path (rebill, appeal, write-off), and recover what's recoverable without burning RVU time on dead-end fights.

What CARC 198 means

The official X12 description is: “Precertification/notification/authorization/pre-treatment exceeded.”

In plain language: Prior auth was obtained but the service exceeded what was approved (more units, longer stay, different code).

Common scenarios

• Inpatient stay extended beyond approved days
• Surgery extended beyond approved procedure
• PT sessions exceeded approved count

Practice workflow for CARC X 198

Appeal the exceeded portion with clinical justification. Often resolved by submitting the chart documentation showing why the additional service was needed (e.g., complications, intra-operative findings).

ApprovalHelp auto-drafts the appeal letter against the right federal appeal-rights regulation (ACA §2719, ERISA §503, NSA §2799A, 42 CFR 422 Subpart M, or 42 CFR 438 Subpart F) for the patient's plan type, the payer's own coverage policy, and the relevant clinical guideline. Drafts route to the clinician for signature in under five minutes.

CARC 198 group codes explained

On the 835 ERA, CARC 198 appears alongside a group code that signals who is financially responsible for the adjustment. CO (Contractual Obligation) — Contractual write-off. The provider agreed to the rate. Patient does NOT owe this amount.