Check out the Centers for Medicare and Medicaid Services' Medicare Learning Network's Matters Article on the Role of Therapy Under the Home Health Patient-Driven Groupings Model (PDGM). While this information primarily affects Home Health Agencies and therapists, this information may be a helpful reference for physicians who establish Medicare Home health plans of care.
Please also reference AAPM&R’s Post-Acute Care (PAC) Toolkit for a primer on the regulations in different PAC settings.