This report on the Intermediate Care Facility for the Mentally Retarded (ICF-MR) and related programs under Title XIX (Medicaid) of the Social Security Act aims to assist in consideration of improvements to Medicaid services. The report begins with a background description of the key Medicaid programs of interest, discussing: federal involvement in care for individuals with mental retardation prior to ICF-MR; establishment of the ICF-MR program; federal "look behinds" of state program review efforts; the phase down option; Medicaid waiver; nursing home restrictions; and proposals for Title XIX reform. The second part contains state-by-state and national statistics on ICF-MR and related Medicaid home and community based services and nursing home utilization. The third part describes characteristics of ICF-MR facilities and their residents, with comparative statistics for noncertified facilities. The data cover: facility administration, resident movement, and resident characteristics (level of retardation, type of related conditions, age distribution, activities of daily living, moods, medical conditions, use of special equipment, and employment status). A basic description of the characteristics of nursing home residents with mental retardation and related conditions is also provided. Includes 29 references. (JDD)