Key Takeaways
- Hospital billing (institutional or facility billing) charges payers for the facility side of care—rooms, equipment, supplies, drugs, and nursing—not the physician's professional work.
- Hospital claims use the UB-04 (CMS-1450) form with revenue codes; physician claims use the CMS-1500.
- Hospital billing combines ICD-10-CM/PCS diagnosis and procedure codes, CPT/HCPCS, revenue codes, and DRGs for inpatient reimbursement.
- The facility revenue cycle runs from registration and eligibility through charge capture, coding, claim submission, payment posting, and denial management.
What is hospital billing?
Hospital billing—also called institutional billing or facility billing—is the process of submitting claims for the services a hospital or facility provides: inpatient stays, outpatient procedures, emergency visits, the operating room, imaging, labs, pharmacy, supplies, and nursing care. It captures the cost of the place and resources where care happens. The separate professional fee for the physician's clinical work is handled through professional (physician) billing on a different claim form.
In short: when you receive care at a hospital, two bills are often generated—one for the facility (hospital billing) and one for the provider (professional billing). Understanding this split is the foundation of accurate hospital revenue cycle management.
Hospital billing vs. professional billing
The clearest way to understand hospital billing is to compare it with professional billing side by side. They use different claim forms, code sets, and reimbursement logic.
| Attribute | Hospital (institutional) billing | Professional (physician) billing |
|---|---|---|
| Claim form | UB-04 (CMS-1450) | CMS-1500 |
| Electronic format | 837I (institutional) | 837P (professional) |
| What it bills | Facility, equipment, supplies, room & board, nursing | Physician/clinician professional service |
| Key code sets | ICD-10-CM/PCS, CPT/HCPCS, revenue codes, DRGs | CPT/HCPCS + ICD-10-CM, modifiers |
| Inpatient reimbursement | Often DRG-based (per-stay) | Fee schedule (per service) |
| Coders | Inpatient/facility coders | Professional fee coders |
How hospital billing works, step by step
The hospital revenue cycle is a sequence of stages that turns a patient encounter into a paid claim. Each step below must be accurate, because errors compound downstream into denials and lost revenue.
- Patient registration & scheduling — capture demographics and insurance details at or before arrival.
- Insurance eligibility & verification — confirm active coverage, benefits, and any prior authorization before services are rendered.
- Charge capture — record every facility service, supply, drug, and resource used during the stay or visit.
- Medical coding — assign ICD-10-CM/PCS, CPT/HCPCS, and revenue codes; inpatient stays group into a DRG.
- Claim creation & scrubbing — build the UB-04/837I claim and run edits to catch errors before submission.
- Claim submission — transmit electronically to the payer (often via a clearinghouse).
- Payer adjudication — the payer reviews and approves, adjusts, or denies the claim.
- Payment posting — post payer payments and adjustments against the account.
- Denial management & appeals — rework, correct, and appeal denied claims promptly.
- Patient billing & collections — bill the patient for any remaining balance after insurance.
The UB-04 and revenue codes
The UB-04 (CMS-1450) is the standard institutional claim form. A defining feature is the revenue code—a four-digit code that tells the payer which department or service the charge belongs to. Pairing the correct revenue code with the correct CPT/HCPCS code is essential for clean claims.
| Revenue code | Department / service |
|---|---|
| 0250 | Pharmacy |
| 0300 | Laboratory |
| 0320 | Radiology — diagnostic |
| 0360 | Operating room services |
| 0450 | Emergency room |
| 0636 | Drugs requiring detailed coding |
Common hospital billing denials and how to prevent them
Most hospital denials trace back to a handful of preventable issues. Strong front-end processes and clean coding stop the majority before they happen.
- Eligibility/coverage errors — verify benefits and authorization before service.
- Missing or invalid authorization — track payer prior-auth rules by service line.
- Coding mismatches — revenue code and CPT/HCPCS must align; diagnoses must support medical necessity.
- Untimely filing — submit within each payer's filing window.
- Duplicate or unbundled charges — scrub claims for NCCI edits before submission.
A disciplined denial management workflow—root-cause tracking plus fast, documented appeals—recovers revenue that would otherwise be written off. For a deeper dive, see our guide on denial management causes and best practices.
Why accurate hospital billing matters
Hospital billing sits at the center of facility revenue cycle management. Because inpatient reimbursement is often DRG-based and a single stay can involve dozens of charges across multiple departments, small coding or charge-capture errors scale into large revenue leakage. Accurate institutional billing protects cash flow, reduces compliance risk, and keeps patient statements correct and trustworthy. Many facilities partner with an experienced billing team to keep clean-claim rates high and denials low—the same discipline that powers strong medical billing services.
Frequently asked questions
Hospital billing, also called institutional or facility billing, is the process of charging insurance payers and patients for a hospital's facility services—rooms, equipment, supplies, drugs, and nursing care—during inpatient and outpatient encounters. It uses the UB-04 claim form and is handled separately from the physician's professional bill.
Hospital (institutional) billing covers the facility side of care and uses the UB-04 (837I) claim with revenue codes and, for inpatients, DRGs. Professional billing covers the physician's clinical service and uses the CMS-1500 (837P) claim with CPT/HCPCS codes and modifiers. They are coded, submitted, and reimbursed separately, which is why a hospital visit often generates two bills.
Hospital billing uses the UB-04, also known as the CMS-1450 form (or the 837I electronic format). Physician/professional billing uses the CMS-1500 form (837P electronic format).
Revenue codes are four-digit codes on the UB-04 that identify the hospital department or type of service a charge belongs to—for example, 0450 for the emergency room or 0360 for operating room services. They must be paired correctly with CPT/HCPCS codes for a claim to be clean.
A DRG (Diagnosis-Related Group) is a classification used to determine a single bundled payment for an inpatient hospital stay based on the patient's diagnoses, procedures, and other factors. Instead of paying per individual service, many payers reimburse inpatient care at a fixed DRG rate per stay.
Yes. Many facilities outsource hospital billing to specialized revenue cycle partners to raise clean-claim rates, reduce denials, and lower overhead. A good partner provides HIPAA-compliant, U.S.-based coders and transparent reporting on clean-claim rate, denial rate, and A/R days.