Box 21 & Box 24E
Diagnosis codes are listed in Box 21; service-line diagnosis pointers in Box 24E point back to those diagnosis positions.
Read the diagnosis pointer guide →Free CMS-1500 field guide
CMS-1500 Box Lookup Tool
Choose a CMS-1500 field to see its general purpose, what to review, and links to detailed Box 21, 24, 31, 32 and 33 guidance.
FREE
No download required
Use this tool in your browser. No patient information is sent to MedClaimSoftware.
Use the quick buttons for frequently searched fields.
How to use the field guide
Look up the field, then check related claim information
This tool explains the general purpose of CMS-1500 (02/12) boxes. Payer, Medicare, Medicaid, workers' compensation, and other program instructions can add requirements, so the applicable filing instructions still control.
Before you mail a claim
Use the free checklist to review patient, provider, diagnosis, service-line, printing, and mailing items.
Open the CMS-1500 checklist →CMS-1500 or UB-04?
Use the free decision helper when you are unsure which paper claim form generally fits the billing workflow.
Open the decision helper →Need to prepare and print CMS-1500 claims?
CMS-1500 + UB-04 Software is $99/year for installation on up to 2 Windows computers. Save claims, reopen them, import supported CMS-1500 Excel data, and control printing and alignment.