Md. Code, Tax - General § 1–204

Before any license may be issued under this article to an employer to engage in an activity in which the employer may employ a covered employee, as defined in § 9-101 of the Labor and Employment Article, the employer shall file with the issuing authority:

(1) a certificate of compliance with the Maryland Workers’ Compensation Act; or

(2) the number of a workers’ compensation insurance policy or binder.