(1) A health carrier must reimburse a chiropractor who has signed a participating provider agreement for services determined by the carrier to be medically necessary if:
(a) The service is:
(i) Covered chiropractic health care, as defined in RCW
48.43.515, by the health plan under which the enrollee received the services; and
(ii) Provided by the chiropractor, or the chiropractor's employee specified in RCW
18.25.190 (2) or (3) who works in the same location as the chiropractor and to whom the chiropractor, pursuant to rules adopted by the Washington state chiropractic quality assurance commission, has delegated the service. The employee must meet the health carrier's reasonable qualifications for all such providers in the relevant class, including but not limited to standards for education and background checks, as applicable; and
(b) The chiropractor complies with the terms and conditions of the participating provider agreement. Violations of the participating provider agreement by an employee of the chiropractor to whom he or she has delegated a service may be deemed by the carrier to have been committed by the chiropractor.
(2) If a health carrier offers a participating provider agreement to a chiropractor within a single practice organized as a sole proprietorship, partnership, or corporation, the carrier must offer the same participating provider agreement to any other chiropractor within that practice providing services at the same location. The agreement may allow either party to terminate it without cause.