HCFA-1500 Form Guide – One of the Most Comprehensive Box-by-Box References
September 02, 2025One of the most comprehensive HCFA-1500 guides online—covering all 33 boxes with X12 837P 5010 mappings, real examples, breakdowns, and links to each article.
HCFA-1500 Box 33b - Other ID
September 01, 2025Learn how to complete HCFA-1500 Box 33b for billing provider secondary identification. Includes valid qualifiers (0B, 1G), 837P REF segment mapping, and when to use legacy IDs.
HCFA-1500 Box 33a - NPI
September 01, 2025HCFA Box 33a on the CMS-1500 form captures the billing provider’s National Provider Identifier (NPI). Learn how this 10-digit number maps to the 2010AA NM109 element in the X12 837P claim transaction with a sample.
HCFA-1500 Box 33 - Billing Provider Info & Phone No
September 01, 2025HCFA Box 33 on the CMS-1500 form captures the billing provider’s name, address, and phone number. Learn how this data maps to the 2010AA loop in the X12 837P (NM1, N3, N4, PER04) with a clear example.
HCFA-1500 Box 32b - Other ID
September 01, 2025HCFA Box 32b on the CMS-1500 is for the Service Facility’s secondary (legacy) ID. See which qualifiers to use (0B, G2, LU) and how it maps to 2310C REF01/REF02 in the X12 837P, with an example (G2 54321).