You bill the SNF only if the services provided fall under consolidated billing. E&M service does not fall under consolidated billing. Check the Medicare instructions for this:
Consolidated billing covers the entire package of care that a resident would receive during a covered Medicare Part A stay. However, some categories of services have been excluded from consolidated billing because they are costly or require specialization. The following categories of services have been excluded from consolidated billing:
Physician's professional services;
Certain dialysis-related services, including covered ambulance transportation to obtain the dialysis services;
Certain ambulance services, including transporting the beneficiary to the SNF initially, transporting from the SNF at the end of the stay (other than when involving transfer to another SNF), and transporting round-trip during the stay temporarily offsite to receive dialysis or certain types of intensive or emergency outpatient hospital services;
Erythropoietin for certain dialysis patients;
Certain chemotherapy drugs;
Certain chemotherapy administration services;
Radioisotope services; and
Customized prosthetic devices.
And from the federal register:
Professional physician services are not subject to consolidated billing, the physician or other licensed health care provider who provides evaluation and management services to an SNF resident bills for these services independently to Medicare Part B. Some
CPT codes carry both a professional and a technical component. For instance, there are laboratory and radiology procedures that are split into a technical component, which accounts for the performance of a particular procedure described by CPT, and the interpretation of the procedures results. An SNF is responsible for the charges incurred by the technical aspect of a service, while the provider bills Medicare directly for the professional aspect. The provider then bills the SNF for the technical expense out of its per diem rate received from Medicare Part A.
Now this is why you bill with the SNF POS when the service provided is E&M. Since an E&M has no technical component, the POS11 reimburses more to cover some overhead. However when the patient is a registered inpatient such as a SNF then Medicare is already paying overhead to the SNF. They will however pay the profession service. That is why you use the SNF POS. The reimbursement will be less than the POS11.