LC 4610(g)(3)(a):

Decisions to approve, modify, delay, or deny requests by physicians for authorization prior to, or concurrent with, the provision of medical treatment services to employees shall be communicated to the requesting physician within 24 hours of the decision. Decisions resulting in modification, delay, or denial of all or part of the requested health care service shall be communicated to physicians initially by telephone or facsimile, and to the physician and employee in writing within 24 hours for concurrent review, or within two business days of the decision for prospective review, as prescribed by the administrative director. If the request is not approved in full, disputes shall be resolved in accordance with Section 4062.