Patients and residents who have not been declared incompetent by a court of appropriate jurisdiction receiving care and maintenance in state institutions shall be billed for the costs of such care and maintenance chargeable to them under section 501 of the Mental Health and Mental Retardation Act of 1966, 50 P. S. § 4501, as assessed by the Revenue Agent of each state institution; such billing to be in the same manner as any patient not suffering mental disability, in any public or private hospital, would be billed for the costs thereof.
55 Pa. Code § 11.89
This section cited in 55 Pa. Code § 11.87 (relating to abatement, modification, or discharge of liability).