The New York State Health Department required the New York City Health Department to include chiropractic in its Medicaid program. Seventeen additional states have also passed legislation to incorporate chiropractic in Medicaid. This report is a descriptive analysis of administrative controls governing the pattern and utilization of chiropractic services in the New York City Medicaid program. These controls include prior authorization of chiropractic treatment plans, post-treatment evaluation through pre-audit of invoices, spot checking of patients, and visitations to offices of chiropractic providers. Court decisions are cited which upheld the City Health Department in its modification of State regulations for chiropractic. By December 1970, 33 per cent of New York City's chiropractors were participating in the program whose vendor expenditure totaled $1,082,712 for 1970. Statistical tables are presented from Medical Participation Schedules.