By Bilscure Editorial Team · Published · Last reviewed
Key takeaways
- CMS-1500 is professional. UB-04, also called CMS-1450, is institutional.
- Most practice claims use the CMS-1500, usually sent as an 837P.
- The UB-04 adds revenue codes and a type of bill. The CMS-1500 does not use them.
- The form a facility uses can vary by payer, so confirm before you bill.
How the two forms differ
The CMS-1500 is the standard form for professional claims. Physicians, therapists and many suppliers use it to bill for their own work. The UB-04, also known as the CMS-1450, is the standard form for institutional claims: charges a hospital or similar facility bills for a visit or stay.
Both have electronic equivalents, and nearly every claim now travels electronically. The 837P carries professional claims and the 837I carries institutional ones.
Picking the right one
Ask who is billing and for what.
- A physician billing an office visit or procedure: CMS-1500 (837P)
- A hospital billing facility charges for an outpatient or inpatient stay: UB-04 (837I)
- A facility whose physicians also bill their own fees: both, as separate claims
Some facility types are paid on one form by one payer and the other by a different payer. Confirm with each payer instead of assuming.
What each form contains
The CMS-1500 is arranged in numbered items and the UB-04 in form locators. Both carry patient and insurance information, diagnoses and provider identifiers. Where they differ is in how services are described:
- CMS-1500: procedure codes (CPT and HCPCS), modifiers, a place of service code and a rendering provider.
- UB-04: revenue codes showing which facility department provided the service, a type of bill code describing the claim and facility-level details.
The National Uniform Claim Committee (NUCC) maintains the CMS-1500 and its instructions. The National Uniform Billing Committee (NUBC) maintains the UB-04. CMS publishes the CMS-1500 form as a PDF.
Why claims bounce
- The wrong form for the payer or provider type
- A missing or mismatched provider identifier
- A revenue code that does not fit the procedure on a UB-04
- A diagnosis that does not support the service billed
- Missing authorization or referral details
A clean claim is one a payer can process without sending it back. Claim review before submission exists to catch these.
Where this does not matter
If your EHR chooses the form and builds the claim for you, you may never handle either one directly. A large hospital with its own facility billing team will treat this as background reading.
What we do about it
We review every claim before it goes out, professional or institutional, and we work inside your existing EHR or practice management system. See our medical billing services, the pages on surgery center billing and hospital billing, or read how an ERA explains the payment afterward.
This article is general information, not legal or compliance advice. Payer rules and regulations change, so confirm current requirements with the payer or the governing agency.