Maryland Code, Labor and Employment § 9-705

(a) If a covered employee is disabled or dies due to an occupational disease, written notice of the disability or death shall be given to the employer by the covered employee or someone on behalf of the covered employee:

(b) Unless notice is waived under subsection (d) of this section or excused by the Commission under § 9-706 of this subtitle, failure to give notice bars a claim under this title.

(c) The employer in whose employment the covered employee was last injuriously exposed to the conditions that cause an occupational disease is considered to have notice of the occupational disease if the employer or the responsible superintendent in charge of the work of the covered employee has actual knowledge that the covered employee:

(d) The notice required by subsection (a) of this section is waived if the employer or its insurer: