Some of Medicare's rules are found in the Medicare Benefit Policy Manual.
Despite getting Board Certified in Geriatric Physical Therapy in 2020, my knowledge was limited before going into Utilization Review.
There are 4 important chapters to know if you're a RN or PT/OT/SLP who works in either:
1️⃣ Utilization Review
2️⃣ Inpatient Rehab
3️⃣ Home Health
4️⃣ Skilled Nursing Facilities
Type CMS in the comments if you're interested in learning more about Medicare Guidelines!