Md. Code, Health Occupations § 1–603

(a) Except as provided in subsection (b) of this section, a health occupations board may not bring charges against a licensee or certificate holder based solely on events contained in a complaint the board receives more than 6 years after:

(1) The day the complainant actually discovered the facts that form the basis of the complaint; or

(2) The day when a reasonable person exercising due diligence should have discovered the facts that form the basis of the complaint.

(b) This section does not apply to a complaint based on:

(1) Criminal convictions or sexual misconduct or other similar boundary violations;

(2) Reciprocal discipline matters;

(3) Ongoing substance abuse;

(4) Fraudulent concealment of material information; or

(5) Acts that occur while a patient is a minor.