Box 10a to 10c: Is the condition related to employment, auto accident, or other accident
By Dr. Daniel Turner, DC · Reviewed September 2, 2026
What goes in Box 10a to 10c of the CMS-1500?
Three yes or no questions telling the payer whether the visit stems from a work injury, a car crash, or another accident, plus the state for auto accidents. Yes answers signal that another payer, workers compensation or an auto policy, may be primary.
What does Box 10a to 10c mean for chiropractic billing?
For a personal injury chiropractic practice this is one of the most consequential boxes on the form. Marking auto accident yes correctly routes health plan claims into coordination against med pay or liability coverage; marking it wrong either hides the accident from a payer that will find out anyway or triggers denials for claims that should have gone to the auto carrier first.
The mistakes that turn this box into denials
- ✗Auto accident marked no on a PI case to hurry a health plan payment
- ✗The state omitted on an auto yes
- ✗Work injuries billed to health plans without the employment yes
The denials this box causes
How Cervica fills Box 10a to 10c
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 14 · Date of current illness, injury, or pregnancy
- →Box 11 and 11a to 11d · Insured policy group number and related details
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.