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HCFA-1500 Box 27 - Accept Assignment

August 25, 2025

HCFA-1500 Box 27 indicates whether the provider accepts assignment of benefits. Learn how “Yes” or “No” maps to CLM07 in the X12 837P 5010 and what it means for claim processing.

HCFA-1500 Box 26 - Patient's Account No.

August 25, 2025

HCFA-1500 Box 26 is used to report the patient’s account number (patient control number). Learn how this value maps to CLM01 in the X12 837P 5010 transaction and why it’s important for claim reconciliation.

HCFA-1500 Box 25 - Federal Tax ID Number

August 25, 2025

HCFA-1500 Box 25 is used to report the billing provider’s Federal Tax ID (EIN or SSN). Learn how this value maps to the 2010AA REF segment in the X12 837P transaction, with examples and tips to avoid claim rejections.

HCFA-1500 Box 24j - Rendering Provider ID

August 25, 2025

HCFA Box 24J on the CMS-1500 claim form is used to report the rendering provider’s identification, typically the NPI. Legacy IDs such as Medicaid or commercial provider numbers may also be included if required. Learn how Box 24J maps to the 2310B and 2420A loops in the X12 837P transaction.

HCFA-1500 Box 24i - Rendering Provider ID Qualifier

August 21, 2025

HCFA-1500 Box 24I is used for the Rendering Provider Secondary Identification, such as Medicaid or commercial legacy IDs. Learn how this maps to the 2310B and 2420A REF segments in the X12 837P 5010.

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