Box 21 on the CMS-1500 Form
Learn what belongs in CMS-1500 Box 21, how diagnosis codes are labeled A–L, and how Box 24E diagnosis pointers connect services to diagnoses.
Paper claim guidance
CMS-1500 filing blog
Practical articles for preparing, reviewing, printing, and troubleshooting professional paper claims.
What Is an NPI Number on the CMS-1500?
Understand the 10-digit National Provider Identifier and where rendering, service-facility, and billing NPIs may appear on a CMS-1500 claim.
CMS-1500 Form: Provider Types
See how provider roles are represented on CMS-1500 claims through billing, rendering, referring, ordering, service-facility, NPI, and taxonomy information.
CMS-1500 Form: Place of Service Codes
Learn where the two-digit Place of Service code goes on CMS-1500 and review common office, home, hospital, telehealth, facility, and laboratory codes.
Can I Print CMS-1500 from a Color Printer?
Learn why ordinary red printing may not satisfy CMS-1500 OCR form specifications and why pre-printed red claim forms are usually the safest paper-filing choice.
Understanding Denial Codes Related to CMS-1500 Submissions
Use the remittance advice, adjustment group code, reason code, and remark code together to understand why a CMS-1500 claim was reduced, rejected, or denied.