CARC 204: This service/equipment/drug is not covered under the patient's current benefit plan.

CARC 204 is the code your insurance company used to explain why your claim was reduced, denied, or paid less than expected. It appears on your Explanation of Benefits (EOB) — the statement your plan sends after a claim is processed. Here's what it means for you and what you can do about it.

What CARC 204 means

The official X12 description is: “This service/equipment/drug is not covered under the patient's current benefit plan.”

In plain language: The benefit-design exclusion — the carrier's policy explicitly leaves this out. Appealable when the exclusion violates federal law (ACA essential health benefits, MHPAEA, etc.).

Common scenarios

• GLP-1 for weight loss exclusion
• Bariatric surgery exclusion
• Mental health coverage limits
• Out-of-network exclusions

What to do next 204

Check your plan's Summary of Benefits and Coverage. If the excluded service is an essential health benefit, ACA §2707 applies. For mental health, MHPAEA prohibits stricter exclusions than for medical. For preventive, ACA §2713 applies.

DenialHelp drafts the appeal letter for you in about five minutes. We cite the federal appeal-rights regulation that applies to your plan type (ACA §2719, ERISA §503, NSA §2799A, 42 CFR 422 Subpart M, or 42 CFR 438 Subpart F), the insurer's own coverage policy, and the relevant clinical guideline.

CARC 204 group codes explained

On the 835 ERA, CARC 204 appears alongside a group code that signals who is financially responsible for the adjustment. PR (Patient Responsibility) — Patient owes this amount. Deductibles, coinsurance, copays, and excluded benefits land here.