Typically in Maryland, the custodial parent is responsible for payment of a minor child's uninsured medical expenses (e.g. co-payments or deductibles) from child support paid by the non-custodial parent.

However, if the child's uninsured medical expenses are "extraordinary," such expenses are added to the basic child support obligation under the Maryland Child Support Guidelines and divided between the parents in proportion to their adjusted actual incomes.

"Extraordinary" medical expenses means uninsured expenses over $100 for a single illness or condition, including reasonable and necessary costs for orthodontia, dental treatment, asthma treatment, physical therapy, treatment for any chronic health problem, and professional counseling or psychiatric therapy for diagnosed mental disorders.