Maryland Code, Health Occupations § 14-605

(1) Have exclusive contracts with a health maintenance organization;

(2) Treat only the patients of the health maintenance organization; and

(3) Agree to accept full assignment for covered services rendered.

(1) Is a participating physician under the Medicare program and, therefore, accepts assignment for all Medicare claims;

(2) Accepts Medicare assignment on a case-by-case basis; or

(3) Does not accept Medicare assignment in any case.