Box 22: Resubmission code and original reference number
By Dr. Daniel Turner, DC · Reviewed September 2, 2026
What goes in Box 22 of the CMS-1500?
How you tell a payer this claim replaces or voids one they already have: frequency code 7 replaces a prior claim, 8 voids one, and the original claim number goes beside it. Without this box completed, a corrected claim looks like a duplicate.
What does Box 22 mean for chiropractic billing?
The single most practical box in denial work. Fixing a denied claim and resubmitting it plain earns a duplicate denial; resubmitting with frequency 7 and the original reference number earns adjudication. One payer wrinkle worth knowing from daily filing: some payers, notably Medicare, reject frequency 7 from certain channels and expect their own corrected claim conventions, so per payer rules beat one habit.
The mistakes that turn this box into denials
- ✗Corrected claims sent without any resubmission code, denying as duplicates
- ✗Code 7 used where a payer requires its own correction process
- ✗The original claim reference number omitted
The denials this box causes
- →OA-18 · see the full fix in the denial library
How Cervica fills Box 22
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 19 · Additional claim information
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.