PR 53 denial code

Claim adjustment reason code 53. Often reported as PR 53 or CO 53.

Care by a relative is not covered

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What 53 means

The plan will not pay because the service was given by a close relative or a member of the patient's household.

Many plans exclude care provided by an immediate family member or someone living in the patient's home. The payer matched the provider to the patient as a relative or household member.

If the match is wrong, for example a shared surname or address, the provider can usually show that and ask for reprocessing.

Group codes seen with 53

On a remittance, 53 comes after a group code. These are the ones it is most often reported with:

• PR 53 (Patient Responsibility): The amount is assigned to the patient. Deductibles, coinsurance and copays are the everyday examples. Whether you can collect it still depends on your contract and the patient's plan.
• CO 53 (Contractual Obligation): The provider's side of the ledger. The reduction comes from the payer contract or a rule the provider has to follow, and the patient normally cannot be billed for it.

The payer chooses the group code for each adjustment, so the same reason code can appear with another group code on your remittance. Read the two together. More about group codes.

Common causes

• The rendering provider is the patient's spouse, parent, child, sibling or other close relative.
• The provider lives in the same household as the patient.
• The payer matched a shared last name or address and assumed a family relationship.

What to do next

1. Confirm whether the rendering provider is related to the patient or shares a household.
2. If they are not related, appeal with a short statement explaining the mistaken match.
3. If they are related, check the plan's exclusion and the group code before deciding on the balance.
4. Have another provider in the practice treat the patient in future if the plan excludes family care.

Related codes

• 96 (reason code) Service not covered by the plan
• 204 (reason code) Not covered under the patient's plan