CO-26 denial code: expenses incurred prior to coverage

Claim adjustment reason code 26 says: expenses incurred prior to coverage. On the date of service, the patient's coverage with this payer hadn't started yet.

Payers send it with group code CO or PR. The real question is whether the patient had other coverage on that date.

PR-27 says coverage ended before the visit. CO-26 says it hadn't started yet. Both come from billing a plan that wasn't active on the date of service.

• The patient gave you their new card early, before the new plan started.
• A new job's coverage has a start date or waiting period after the patient's first visit.
• Medicare starts on the first day of a month, so a visit late in the month before can fall before it.
• The date of service on the claim is wrong.

1. Check the coverage start date with the payer.
2. Check the date of service on the claim against the note.
3. Find the coverage the patient had on that date, such as their previous plan, and bill it within its filing limit.
4. If they had none, bill the patient under your financial policy.

• Verify eligibility for the date of service, and read the coverage start date.
• Keep the previous plan on file when a patient changes coverage, until the new one starts.
• Re-check coverage at the start of each month and year, when plans change.

CO-26 is decided by the patient's coverage on the day, so it is prevented at booking.

Claira Health's AI agents confirm coverage and the right payer before the visit, so this denial is stopped at the front desk instead of coming back weeks later. Your team sees only what needs a decision, and approves every step. On a 20-minute call, we’ll walk through it using one of your own denials.

Book a 20-minute call to see your coverage-date denials.