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Medicare Billing: CMS-1450 & 837I

Loop 2300/FL 4

R icon; required
Table 27: Loop 2300/FL 4 Field
Type of BillSource
Enter the 4-digit alphanumeric code that offers specific information about the type of bill (TOB) sent to a payer from the billing company.NUBC

The 4-digit Type of Bill code appears as follows:

  • The first digit is always a placeholder zero. It only appears on paper forms and isn't submitted on electronic claims.
  • The second digit identifies the type of facility; for example, a hospital.
  • The third digit classifies the type of care; for example, outpatient care versus inpatient care.
  • The fourth digit can be a letter or number that indicates the sequence or frequency of the bill within a particular episode of care; for example, interim.

  • 0123 – Hospital inpatient (interim continuing claim)
  • 0131 – Hospital outpatient (admit through discharge claim)
  • 0811 – Hospice (nonhospital-based, admission or initial bill)
  • 0711 – Clinic: Rural Health Clinic (RHC – admit through discharge claim)

For details on claim coding for adjustment and late charge claims, review the Medicare Claims Processing Manual, Chapter 1.