Box 26: Patient account number
By Dr. Daniel Turner, DC · Reviewed September 2, 2026
What goes in Box 26 of the CMS-1500?
Your internal account or chart number for the patient. The payer echoes it back on the remittance, which is exactly why it matters.
What does Box 26 mean for chiropractic billing?
This box helps software match remittances to claims: the payer returns it on the ERA and the software matches payment to patient without a human hunting. Software that fills it consistently earns its keep every posting day.
The mistakes that turn this box into denials
- ✗Left blank, making every remittance line a manual match
How Cervica fills Box 26
Cervica generates the CMS-1500 and its electronic 837P equivalent from the chart and the payer's own rules: identifiers from the verified insurance record, modifiers and codes per payer, and pre submission scrubbing that flags exactly the mistakes listed above before a claim leaves the building.
Related boxes
- →Box 24A to 24J · The service lines
General information for billing teams, not billing advice for any individual claim. The NUCC's 1500 Claim Form instructions and each payer's companion guides control.