A 131 Type of Bill (TOB 131) is a four-digit code on UB-04 forms that identifies an emergency room visit ending in discharge or transfer without inpatient admission.
What’s happening here?
TOB 131 is used when a patient receives emergency care and is discharged or transferred without being admitted as an inpatient.
This code keeps hospitals and insurers on the same page about visits that start in the ER but don’t turn into an overnight stay. According to the Centers for Medicare & Medicaid Services (CMS), TOB 131 has been the go-to for tracking these non-converted ER episodes since 2026. The “0131” code breaks down like this: zero (no inpatient), one (hospital facility), three (outpatient), and one (unique episode). It’s a simple way to make sure claims get processed right and don’t get tangled up with inpatient claims, which can be classified as a labor bill in some cases.
How do I actually file a TOB 131 claim correctly?
To file a correct TOB 131 claim, enter 0131 in Form Locator 4, align the admit date with ER registration, and assign accurate revenue codes for each service provided.
- Open your billing system’s UB-04 form (for example, Epic 2025.2.1 or Cerner Millennium 2026), which involves understanding the different types of logical connectors used in medical billing.
- In Form Locator 4 (Type of Bill), type 0131—zero-one-three-one. No spaces or dashes—just the digits.
- Set the admit date in FL 6 to the exact ER registration timestamp. CMS insists on this level of detail to keep denials at bay, similar to how stylistics are used to analyze language patterns.
- Assign revenue codes in FL 42–49 (think 0450 for the ER visit itself, 0761 for X-rays). Stick to the latest NUBC revenue code list, updated March 2026, and be aware of the types of research that inform these codes.
- Export as 837-I or 837-P and send it off through your clearinghouse or direct EDI, following the medical billing process carefully.