; and (2) the amounts appropriated to CHEF under this section. (b) Administration CHEF shall be administered by the Secretary, acting through the headquarters of the Service, solely for the purpose of meeting the extraordinary medical costs associated with the treatment of victims of disasters or catastrophic illnesses who are within the responsibility of the Service. (c) Conditions on use of fund No part of CHEF or its administration shall be subject to contract or grant under any law, including the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 450 et seq.), nor shall CHEF funds be allocated, apportioned, or delegated on an Area Office, Service Unit, or other similar basis. (d) Regulations The Secretary shall promulgate regulations consistent with the provisions of this section to— (1) establish a definition of disasters and catastrophic illnesses for which the cost of the treatment provided under contract would qualify for payment from CHEF; (2) provide that a Service Unit shall not be eligible for reimbursement for the cost of treatment from CHEF until its cost of treating any victim of such catastrophic illness or disaster has reached a certain threshold cost which the Secretary shall establish at— (A) the 2000 level of $19,000; and (B) for any subsequent year, not less than the threshold cost of the previous year increased by the percentage increase in the medical care expenditure category of the consumer price index for all urban consumers (United States city average) for the 12-month period ending with December of the previous year; (3) establish a procedure for the reimbursement of the portion of the costs that exceeds such threshold cost incurred by— (A) Service Units; or (B) whenever otherwise authorized by the Service, non-Service facilities or providers; (4) establish a procedure for payment from CHEF in cases in which the exigencies of the medical circumstances warrant treatment prior to the authorization of such treatment by the Service