(1) Providers must bill for services using the procedure codes and modifiers set forth, and according to the definitions contained in the Health Care Financing Administration's Common Procedure Coding System (HCPCS). Information regarding billing codes, modifiers, and HCPCS is available upon request from the Department of Public Health and Human Services, Health Resources Division, 1401 East Lockey, P.O. Box 202951, Helena, MT 59620-2951.

(2) Subject to the requirements of this rule, the Montana Medicaid program pays the following for audiology services:

(a) For patients who are eligible for Medicaid, the lowest of:

(i) the provider's usual and customary charge for the service;

(ii) the reimbursement provided in accordance with the methodologies described in ARM 37.85.212;

(iii) 100% of the Medicare Region D allowable fee; or

(iv) for items or services where no RBRVS fee is available, the fee schedule amount will be calculated using the following methodology:

(A) Establishing a fee for a service or item that has been billed at least 50 times by all providers in the aggregate during the previous 12-month period. The department will set each fee at the payment-to-charge ratio under ARM 37.85.105(2)(d).

(B) For services where utilization cannot meet the methodology outlined in (A), the fee shall be set at the same rate as a service similar in scope.