▁H osp it als ▁must ▁ad here ▁to ▁several ▁gu idel ines . ▁They ▁may ▁have ▁no ▁more ▁than ▁ 2 5 ▁b eds ▁and ▁must ▁have ▁an ▁average ▁duration ▁of ▁hospital ▁stay ▁under ▁ 9 6 ▁hours . ▁They ▁must ▁also ▁be ▁more ▁than ▁ 3 5 ▁miles ▁from ▁another ▁hospital , ▁with ▁exceptions ▁allowed ▁for ▁areas ▁with ▁poor ▁roads ▁or ▁difficult ▁terrain . ▁ ▁CA H s ▁have ▁more ▁flex ibility ▁than ▁other ▁hosp it als ▁in ▁staff ing ▁requirements . ▁They ▁must ▁offer ▁ 2 4 / 7 ▁emer gency ▁care ▁and ▁have ▁a ▁phys ician ▁on - call ▁available ▁to ▁be ▁on - site ▁within ▁ 6 0 ▁minutes . ▁They ▁are ▁required ▁to ▁have ▁a ▁Register ed ▁Nur se ▁on ▁site ▁at ▁all ▁times ▁when ▁ac utely ▁ill ▁patients ▁are ▁in ▁the ▁hospital . ▁At ▁other ▁times , ▁an ▁L PN ▁may ▁fill ▁in . ▁ ▁In ▁most ▁cases , ▁a ▁doctor ▁of ▁medicine ▁or ▁o ste op ath y , ▁a ▁phys ician ▁assistant , ▁a ▁nur se ▁pract ition er , ▁or ▁a ▁clin ical ▁nur se ▁special ist ▁( defined ▁as ▁a ▁nur se ▁with ▁at ▁least ▁a ▁master ' s ▁degree ▁in ▁n urs ing ) ▁must ▁be ▁available ▁for ▁immediate ▁contact ▁by ▁phone ▁or ▁radio . ▁The ▁provider ▁must ▁be ▁able ▁to ▁be ▁on - site ▁within ▁ 3 0 ▁minutes ▁unless ▁it ▁is ▁an ▁area ▁designated ▁by ▁the ▁census ▁as ▁a ▁" front ier ▁area " ▁or ▁if ▁the ▁state ▁has ▁determined