Maryland Code, Insurance § 10-503

(1) recommend the use of a specific repair service or source for the repair or replacement of property damage to a motor vehicle without informing the claimant or insured that the claimant or insured does not have to use the recommended repair service or source;

(2) require that an appraisal or repair be made in a specific repair shop;

(3) require that a claimant or insured use a specific contractor or repair shop for a repair service or repair product; or

(4) intimidate, coerce, or threaten a claimant or insured to use a specific contractor or repair shop for a repair service or repair product.