Md. Code, Health Occupations § 2–307.4

(a) A licensee shall identify and represent themselves to the public by:

(1) The profession for which the licensee holds a license;

(2) The degree earned to obtain the license; and

(3) The name on the license.

(b) A licensee shall include the licensee’s license number on work–related documentation, including:

(1) Written client reports; and

(2) If applicable, audiograms.