S.1737: A bill to amend title XVIII of the Social Security Act to provide for a waiver of the 35-mile drive requirement for designations of critical access hospitals.

Critical Access Hospital Flexibility Act of 2007 - Amends title XVIII (Medicare) of the Social Security Act to authorize the Secretary of Health and Human Services to waive, where appropriate, the requirement for state designation of a critical access hospital that it be more than a 35-mile drive (or, in the case of mountainous terrain or in areas with only secondary roads available, a 15-mile drive) from another hospital or medical facility.