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What Is A 131 Type Of Bill?

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Last updated on 3 min read
Financial Disclaimer: This article is for informational purposes only and does not constitute financial, tax, or legal advice. Consult a qualified financial advisor or tax professional for advice specific to your situation.

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.

  1. 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.
  2. In Form Locator 4 (Type of Bill), type 0131—zero-one-three-one. No spaces or dashes—just the digits.
  3. 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.
  4. 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.
  5. Export as 837-I or 837-P and send it off through your clearinghouse or direct EDI, following the medical billing process carefully.

Why did my TOB 131 claim get rejected?

Common TOB 131 claim rejections include wrong frequency digits, inclusion of inpatient charges, or missing revenue codes.

  • If the patient swings back within 30 days, switch to TOB 133 (interim continuing care) or 134 (interim last) instead of 131, and consider the English Bill of Rights as a historical context for patient rights.
  • If any inpatient charges sneak in, pivot to TOB 111 (inpatient admit-through-discharge) and tack on modifier –TC for the technical component, which may involve understanding types of classifications in medical billing.
  • Double-check your revenue codes against the 2026 CMS National Correct Coding Initiative (NCCI) edits—this keeps them TOB 131-friendly, similar to how types of French are classified in Canada.

How can I stop TOB 131 errors before they happen?

Train front desk staff to verify patient status at registration and use EHR flags to mark “TOB-131-ready” episodes before billing.

Every registration should run through these three checks: 1) inpatient vs. outpatient status, 2) exact ER arrival time, and 3) final discharge disposition. Run monthly audits using the 2026 CMS NCCI edits to catch mismatches early. Honestly, most TOB 131 headaches come from rushed registration or outdated code tables—solid training can cut denials by up to 40% in big hospital systems, and it's also interesting to note that Bill Skarsgård has nothing to do with medical billing, but rather is a topic of a different kind.

Edited and fact-checked by the FixAnswer editorial team.
Ahmed Ali

Ahmed is a finance and business writer covering personal finance, investing, entrepreneurship, and career development.