Medicare General Information, Eligibility and Entitlement Manual (Pub. 100-01), Ch. 3 § 10.4
Benefit Period (Spell of Illness)
10.4 - Benefit Period (Spell of Illness)
(Rev. 1, 09-11-02)
A benefit period is a period of time for measuring the use of hospital insurance benefits.
It is a period of consecutive days during which covered services furnished to a patient, up
to certain specified maximum amounts, may be paid for by the hospital insurance plan.
For example, a patient is eligible for 90 days of hospital care in a benefit period and 100
days of extended care services during the same benefit period. A patient may be eligible
for as many as l50 days of hospital care in a benefit period if he/she draws on his/her
lifetime reserve. As long as a person continues to be entitled to hospital insurance, there
is no limit on the number of benefit periods he/she may have. The term "benefit period"
is synonymous with spell of illness. Since the term "spell of illness" could connote a
single illness or a particular "spell" of sickness, the term benefit period is used in
communications with the public.