Section 15. The director may require the administrator of a public facility or a private facility with which the division contracts on a fee-for-services basis pursuant to clause (4) of section six, other than a halfway house, to admit as an inpatient or an outpatient any person for whom, in the determination of the director, adequate and appropriate treatment is available at the facility. The commissioner shall promulgate rules and regulations governing the extent to which the director may require the administrator of a private facility with which the division does not contract on a fee-for-services basis pursuant to said clause (4), other than a halfway house, to admit as an inpatient or outpatient any person for whom, in the determination of the director, adequate and appropriate treatment is available at the facility.