The standard CONUS rate depends on locality and seasonal fluctuations, therefore where you choose to deliver your baby and the time of year matters! OB medevacs are authorized per diem at the place of medical care, thus the delivery hospital zip code (16 FAM 315.2b). Please note if you stay in a location with a different per diem rate than your authorized medevac site, per diem will be authorized at the lesser of the two rates. During OB Med, the mother receives 100% of the locality + seasonal rate established by the General Services Administration (GSA); any Eligible Family Members (EFMs) ages 12+ receive 75% of that rate; and EFMs under the age of 12—including newborns—receive 50%.