Md. Code, Lab. & Empl. § 9-656 : LABOR AND EMPLOYMENT — WORKERS' COMPENSATION — BENEFITS — PERMANENT DISABILITY DUE IN PART TO PREEXISTING DISEASE OR INFIRMITY —656 - Apportionment

(a) If it appears that a permanent disability of a covered employee following an accidental personal injury or occupational disease is due partly to the accidental personal injury or occupational disease and partly to a preexisting disease or infirmity, the Commission shall determine:
(1) the proportion of the disability that is reasonably attributable to the accidental personal injury or occupational disease; and
(2) the proportion of the disability that is reasonably attributable to the preexisting disease or infirmity.
(b) The covered employee:
(1) is entitled to compensation for the portion of the disability of the covered employee that is reasonably attributable solely to the accidental personal injury or occupational disease; and
(2) is not entitled to compensation for the portion of the disability that is reasonably attributable to the preexisting disease or infirmity.

Md. Code, LE § 9-656

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