CARC 209 Active

OA-209: Provider Cannot Collect from Patient per Regulatory Agreement

TL;DR

Do not bill the patient. Submit to a secondary payer if available, otherwise adjust the balance off the account.

Action

Review & Decide

Who Pays

Depends

Appeal

Patient Impact

Indirect

Disclaimer

This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does OA-209 Mean?

With OA (Other Adjustments), this is the standard group code for CARC 209. The amount cannot be collected from the patient due to regulatory or contractual protections. Bill a secondary payer if one exists, or adjust the balance. Do not bill the patient.

CARC 209 is a critical compliance code that signals the provider cannot bill the patient for the adjusted amount. Federal or state regulations, or contractual agreements, prohibit collecting this balance from the patient. The most common scenario is a Qualified Medicare Beneficiary (QMB) — federal law prohibits providers from collecting Medicare deductibles, coinsurance, and copayments from QMB patients.

This code also applies under the No Surprises Act, state balance billing laws, and certain contractual arrangements. If a secondary payer exists, the provider may submit the claim to that payer. Otherwise, the amount must be adjusted off the account. Billing the patient for this amount violates federal or state law and can result in penalties.

Common Causes

Cause	Frequency
Qualified Medicare Beneficiary (QMB) protection The patient is a QMB and federal law prohibits providers from collecting Medicare deductibles, coinsurance, and copayments from QMB patients	Most Common
Regulatory prohibition on patient billing Federal or state regulations prohibit the provider from collecting the adjusted amount from the patient, such as under the No Surprises Act or state balance billing laws	Most Common
Contractual agreement limiting patient collections A contractual agreement between the provider and payer restricts the provider from billing the patient for this amount	Common
Coordination of benefits with subsequent payer The amount cannot be collected from the patient but may be billed to a secondary or subsequent payer	Common
Charity care or financial hardship program The patient qualifies for a financial hardship or charity care program that prohibits collection of this amount	Occasional

How to Resolve

Identify the protection type Check the remark code (especially N781 for QMB) to understand the specific prohibition.
Submit to secondary payer If a secondary insurer exists, submit the claim for the adjusted amount.
Adjust the balance If no secondary payer exists, write off the amount — it cannot be collected from the patient.
Refund any incorrect collections If the patient was billed or paid any amount covered by this protection, issue an immediate refund.

Do Not Appeal This Code

This amount cannot be collected from the patient per regulatory or contractual agreement. The adjustment is correct. If a secondary payer exists, bill them for this amount. Otherwise, write off the balance. Do not bill the patient.

Common RARC Pairings

The RARC code tells you exactly what triggered the OA-209:

RARC	Description
N781	Alert: Patient is a Qualified Medicare Beneficiary. Review your records for any wrongfully collected deductible. Do not bill the patient — they are a QMB and federal law prohibits balance billing. Refund any amounts collected. →
N381	Alert: Consult your contractual agreement for restrictions, billing, and payment information. Review your contract with the payer for specific restrictions on patient billing for this amount →

How to Prevent OA-209

Verify QMB status and other regulatory protections during patient registration before collecting any patient payments
Implement automated alerts in your billing system that flag patients with regulatory protections against balance billing
Train front desk and billing staff on which patient populations are protected from balance billing (QMB, No Surprises Act, etc.)
Maintain up-to-date records of payer contracts that include patient collection restrictions
Bill secondary payers promptly when the primary payer applies OA-209
Establish a process to identify and refund any amounts incorrectly collected from protected patients

Also Filed As

The same CARC 209 may appear with different Group Codes:

CO-209 PR-209

Related Denial Codes

OA-100 — Payment Made to Patient/Insured OA-105 — Tax Withholding Amount OA-121 — Indemnification Adjustment OA-133 — Service Line Pending Further Review OA-136 — Failure to Follow Prior Payer's Coverage Rules

Sources

https://x12.org/codes/claim-adjustment-reason-codes
https://www.mdclarity.com/denial-code/209
https://portal.ct.gov/-/media/ohs/health-it-advisory-council/apcd-advisory-group/data-submission-guide-workgroup/meeting-materials/6-30-22/carc-codes_final.pdf
Codes maintained by X12. Visit x12.org for official definitions.