Hello, Claim was rejected with Medicare for invalid Pos. 99203 billed with pos 21 did not work.
Your claim is correct. There is either something else wrong or you need to appeal here is what the Medicare manual on POS states:
Item 24B - Enter the appropriate place of service code(s) from the list provided in section 10.5. Identify the setting, using a place of service code, for each item used or service performed. This is a required field.
NOTE: When a service is rendered to a patient who is a registered inpatient or an outpatient (off campus or on campus) of a hospital, use the inpatient hospital POS code 21, Off Campus-Outpatient Hospital POS code 19, or On Campus-Outpatient Hospital POS code 22, respectively, as discussed in section 10.5 of this chapter.
Special Considerations for Services Furnished to Registered Inpatients
Section 10.5 states:
When a physician/practitioner furnishes services to a registered inpatient, payment is made under the PFS at the facility rate. To that end, a physician/practitioner/supplier furnishing services to a patient who is a registered inpatient, shall, at a minimum, report the inpatient hospital POS code 21 irrespective of the setting where the patient actually receives the face-to-face encounter. In other words, reporting the inpatient hospital POS code 21 is a minimum requirement for purposes of triggering the facility payment under the PFS when services are provided to a registered inpatient. If the physician/practitioner is aware of the exact setting the beneficiary is a registered inpatient, the appropriate inpatient POS code may be reported consistent with the code list annotated in this section (instead of POS 21). For example, a physician/practitioner may use POS 31, for a patient in a SNF receiving inpatient skilled nursing care, POS 51, for a patient registered in a Psychiatric Inpatient Facility, and POS 61 for patients registered in a Comprehensive Inpatient Rehabilitation Facility.