CO 31 Denial Code - Fix Patient ID Issues
Code 31 indicates that the payer cannot match the patient details on the claim to any insured individuals in their system. This means the claim lacks sufficient information to confirm coverage under the policy the provider billed.
Who Pays: Group Code Liability
Code 31 usually lands as PR-31 — the payer has no record of the patient as its member, which puts the balance on the patient on paper. Treat billing the patient as the last step, not the first: most 31 denials are fixable identification errors (transposed member ID, wrong payer, name or DOB mismatch), and a corrected claim to the right plan recovers the money. If verification confirms the patient truly has no coverage, the account converts to self-pay and the patient can be billed.
Why Claims Get Code 31
- Incorrect or missing patient ID number on the claim form.
- Patient's name or date of birth does not match insurer's records.
- Insurance information was not updated in the provider's system.
- Claim submitted with an outdated insurance policy number.
- Patient's insurance coverage was terminated before the date of service.
How to Fix & Resubmit
- Verify the patient's insurance information against what was submitted, checking for any discrepancies.
- Contact the patient to confirm current insurance details, including policy number, name, and date of birth.
- Correct any errors in the patient demographics or insurance information in the billing system.
- Resubmit the claim with the corrected patient and insurance information.
- If the patient's coverage was terminated, discuss alternative payment options with the patient.
Corrected Claim or Appeal?
For code 31, a corrected claim is generally required after verifying and updating patient insurance details. An appeal is rarely needed unless there's a disagreement about the termination of coverage.
Preventing Future 31 Denials
- Always verify insurance details during registration and before services are rendered.
- Implement regular updates to patient information in the billing system to avoid outdated records.
- Train staff to double-check patient demographics and insurance details before claim submission.
- Use eligibility verification tools to confirm active coverage prior to service.