Interactive UB-04 field guide for behavioral health facility billing

The UB-04 (also called the CMS-1450) is the institutional claim form used by facilities such as hospitals, residential treatment centers, and intensive outpatient programs. The CMS 1500 is the professional claim form used by individual practitioners and group practices. The key structural difference is that UB-04 claims use revenue codes to classify services by category, while CMS 1500 claims rely primarily on CPT procedure codes. UB-04 claims also include facility-specific fields like the type of bill code, occurrence codes, and condition codes that don’t exist on the CMS 1500.

The determining factor is your billing entity type and the level of care you provide. If you are a licensed facility billing for inpatient psychiatric hospitalization, partial hospitalization (PHP), intensive outpatient (IOP), or residential treatment, you will use the UB-04. If you are an individual provider or group practice billing for standard outpatient therapy sessions, evaluations, or medication management, you will use the CMS 1500. Some organizations file both, for example a community mental health center that has both an outpatient clinic and a PHP program.

A revenue code is a four-digit code entered in Form Locator 42 that identifies the category of service provided. Revenue codes tell the payer what type of room, service, or treatment produced the charge on that line. Unlike CPT codes, which describe specific procedures, revenue codes describe the service category. For example, revenue code 0100 covers all-inclusive room and board, while the 0900 series covers behavioral health services. Most payers require both a revenue code and a CPT or HCPCS code on each service line for behavioral health facility claims.

The 0900 series is the primary revenue code range for behavioral health services. Revenue code 0900 is the general behavioral health code used for inpatient psychiatric room and board. Revenue code 0901 is used for electroconvulsive therapy. Revenue code 0914 is commonly used for intensive outpatient (IOP) services, and revenue code 0916 is used for partial hospitalization (PHP). Some payers also require room and board codes in the 0100 series for inpatient stays alongside the 0900-series therapy codes. Always verify revenue code requirements with each specific payer, as contracts can differ.

The type of bill code is entered in Form Locator 4 and is a three-digit code that identifies the facility type, the type of care, and the claim frequency. For an intensive outpatient program billed through a hospital outpatient department, the TOB is typically 131 (hospital outpatient, admit through discharge). For a freestanding psychiatric facility billing IOP, the TOB is often 761. The correct code depends on your facility type and payer contract. Using the wrong TOB is one of the most common causes of UB-04 claim denials in behavioral health.

Several errors appear frequently in behavioral health UB-04 denials. Wrong type of bill code is the most common, particularly when a facility uses an inpatient TOB for a partial hospitalization claim or vice versa. Missing or incorrect occurrence codes are another frequent issue, especially for payers that require occurrence code 11 (onset of symptoms) or occurrence code 35 (date of accident) when applicable. Revenue code and CPT code pairing mismatches cause denials when a payer’s editing system does not recognize the combination. Finally, using a Type 1 individual NPI instead of the facility’s Type 2 organizational NPI will trigger a denial on nearly every payer.