HCFA makes day of admission as day one for both PPS, RAI (resident assessment instrument).
D014487:Centers for Medicare and Medicaid Services, U.S.; D007344:Insurance Claim Reporting; D007902:Length of Stay / Q000331:legislation & jurisprudence*; D006278:Medicare; D010343:Patient Admission / Q000331:legislation & jurisprudence*; D011445:Prospective Payment System / Q000331:legislation & jurisprudence*; D012866:Skilled Nursing Facilities / Q000191:economics*; D019467:Subacute Care / Q000191:economics; D014481:United States