What is the difference between inpatient and outpatient claims on UB-04?

• A. Inpatient claims (TOB 11x or 12x) cover longer hospital stays; outpatient claims (TOB 13x, 22x) cover services not requiring admission
• B. Inpatient claims are always paid first
• C. Outpatient claims require admission
• D. Inpatient claims are never associated with discharge dates

Answer: (A)

The main thing this is testing is how UB-04 uses Type of Bill codes to show whether a claim is for an inpatient stay or for outpatient services. Inpatient hospital claims use TOB codes like 11x or 12x, which signals that the patient was admitted and will have a discharge date marking the end of the stay. Outpatient claims use TOB codes such as 13x or 22x, indicating services provided without a full hospital admission, such as same-day procedures or clinic encounters, where there isn’t an overnight stay.

This distinction matters because inpatient claims are tied to a length of stay and a discharge date, reflecting a period of hospitalization, while outpatient claims cover services delivered without admission and are generally billed differently.

Why the other ideas don’t fit: inpatient claims aren’t inherently paid first—the timing of payment depends on the payer and process; outpatient claims don’t require admission (that’s the opposite of what they describe); and inpatient claims are indeed associated with discharge dates, so saying they aren’t would be incorrect.