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HCFA-1500 Box 24b - Place of Service

August 18, 2025

HCFA Box 24B on the CMS-1500 form is used to report the place of service (POS) code for each service line. Learn how this maps to CLM05-1 and SV105 in the X12 837P 5010.

HCFA-1500 Box 24a - Date(s) of Service

August 17, 2025

HCFA Box 24A on the CMS-1500 form reports the dates of service for each procedure. Learn how these dates map to the 2400 DTP segment in the X12 837P 5010 transaction, including proper formatting examples.

HCFA-1500 Box 23 - Prior Authorization Number

August 13, 2025

HCFA Box 23 on the CMS-1500 form is used for prior authorization numbers, referral numbers, CLIA numbers, or other identifiers. Learn how this maps to the 2300 REF segment in the X12 837P 5010.

HCFA-1500 Box 22 - Resubmission Code and Original Reference Number

August 11, 2025

HCFA Box 22 on the CMS-1500 form is used for claim resubmission codes and original reference numbers. Learn how it maps to CLM05-3 and REF*F8 in the X12 837P 5010.

HCFA-1500 Box 21 - Diagnosis or Nature of Illness or Injury

August 10, 2025

HCFA Box 21 on the CMS-1500 claim form is used to report the diagnosis codes for the patient's condition or complaint. Learn how these map to the 2300 HI segment in the X12 837P 5010.

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