Any payments received by a hospital or skilled nursing facility of the Service (whether operated by the Service or by an Indian tribe or tribal organization pursuant to a contract under the Indian Self-Determination Act [
25 U.S.C.
450f et seq.]) for services provided to Indians eligible for benefits under title XVIII of the Social Security Act [
42 U.S.C.
1395 et seq.] shall not be considered in determining appropriations for health care and services to Indians.