Hospital Observation Services During Global Surgical Period - Billing Guide

The global surgical fee includes payment for hospital observation (codes 99217, 99218, 99219, 99220, 99224, 99225, 99226, 99234, 99235, and 99236) services unless the criteria for use of CPT modifiers “-24,” “-25,” or “-57” are met. Contractors must pay for these services in addition to the global surgical fee only if both of the following requirements are met:

• The hospital observation service meets the criteria needed to justify billing it with CPT modifiers “-24,” “-25,” or “-57” (decision for major surgery); and

• The hospital observation service furnished by the surgeon meets all of the criteria for the hospital observation code billed.

Examples of the decision for surgery during a hospital observation period are:

• An emergency department physician orders hospital outpatient observation services for a patient with a head injury. A neurosurgeon is called in to evaluate the need for surgery while the patient is receiving observation services and decides that the patient requires surgery. The surgeon would bill a new or established office or other outpatient visit code as appropriate with the “-57” modifier to indicate that the decision for surgery was made during the evaluation. The surgeon must bill the office or other outpatient visit code because the patient receiving hospital outpatient observation services is not an inpatient of the hospital. Only the physician who ordered hospital outpatient observation services may bill for observation care.

• A neurosurgeon orders hospital outpatient observation services for a patient with a head injury. During the observation period, the surgeon makes the decision for surgery. The surgeon would bill the appropriate level of hospital observation code with the “-57” modifier to indicate that the decision for surgery was made while the surgeon was providing hospital observation care.


Examples of hospital observation services during the postoperative period of a surgery are:

• A surgeon orders hospital outpatient observation services for a patient with abdominal pain from a kidney stone on the 80th day following a TURP (performed by that surgeon). The surgeon decides that the patient does not require surgery. The surgeon would bill the observation code with CPT modifier “-24” and documentation to support that the observation services are unrelated to the surgery.

• A surgeon orders hospital outpatient observation services for a patient with abdominal pain on the 80th day following a TURP (performed by that surgeon). While the patient is receiving hospital outpatient observation services, the surgeon decides that the patient requires kidney surgery. The surgeon would bill the observation code with HCPCS modifier “-57” to indicate that the decision for surgery was made while the patient was receiving hospital outpatient observation services. The subsequent surgical procedure would be reported with modifier “-79.”

• A surgeon orders hospital outpatient observation services for a patient with abdominal pain on the 20th day following a resection of the colon (performed by that surgeon).
The surgeon determines that the patient requires no further colon surgery and discharges the patient. The surgeon may not bill for the observation services furnished during the global period because they were related to the previous surgery.

An example of a billable hospital observation service on the same day as a procedure is when a physician repairs a laceration of the scalp in the emergency department for a patient with a head injury and then subsequently orders hospital outpatient observation services for that patient. The physician would bill the observation code with a CPT modifier 25 and the procedure code.