UB-04 (institutional claim)

The UB-04—officially designated the CMS-1450 by the Centers for Medicare & Medicaid Services—is the universal claim form for institutional providers. Hospitals, ambulatory surgery centers (ASCs), skilled nursing facilities, inpatient rehabilitation units, and certain residential facilities all use it to request reimbursement for facility charges. The National Uniform Billing Committee (NUBC) governs the form's data specifications, and CMS Chapter 25 of the Medicare Claims Processing Manual defines exactly how each field must be completed for Medicare submissions.

The form is organized around numbered Form Locators (FLs). Key FLs for orthopedic billing include FL42 (Revenue Code), FL44 (HCPCS/procedure code with up to four modifiers), FL45 (Service Date), FL67 (Principal Diagnosis ICD-10-CM), and FL74 (Principal Procedure). Because the UB-04 captures charges at the facility level, it reflects the cost center structure of the hospital—meaning a single surgical encounter may span multiple revenue code lines (e.g., operating room, implants, anesthesia supplies, physical therapy).

For orthopedic procedures performed in a hospital or ASC setting, the UB-04 travels alongside—but is legally separate from—the CMS-1500 submitted by the surgeon for the professional component. Payers adjudicate both claims under different fee schedules (the facility payment and the professional payment), so errors on the UB-04 do not automatically affect the surgeon's reimbursement, but a denial on either form can create coordination-of-benefits confusion and delay the patient's episode from closing.

An error on a single UB-04 field can trigger an outright denial, a request for additional documentation, or a post-payment audit. Institutional claims carry an average denial rate near 22%, and facility billing errors cost hospitals millions annually. For orthopedic episodes specifically, a mismatched revenue code (e.g., submitting an outdated or incorrect cost-center code for the implant line) or a missing HCPCS modifier can cause the entire claim to deny—delaying payment for a high-dollar encounter such as a total joint replacement or spinal fusion. Because CMS and commercial payers cross-reference the UB-04 diagnosis codes against medical necessity criteria, ICD-10-CM specificity on the UB-04 must align with the surgeon's operative note and the coder's principal procedure selection; discrepancies between the facility claim and the professional claim are a recognized audit trigger.