MAXIMUS serves as the enrollment broker for California 's Medi-Cal (Medicaid) managed-care program, called California Health Care Options (CA HCO). This contract is one of the largest enrollment services contract in the nation. MAXIMUS provides managed health care education and enrollment services for 4.6 million Medi-Cal applicants and beneficiaries.

MAXIMUS operates a toll-free call center in Sacramento, California staffed by full- and part-time customer service representatives, research analysts, and enrollment forms processors. Additionally, full- and part-time enrollment services representatives make educational presentations throughout California in County Welfare Offices and in other space leased by MAXIMUS. MAXIMUS has placed culturally and linguistically competent staff in offices where the heaviest concentration of TANF and Medi-Cal beneficiaries reside. The staff also conduct outreach activities and presentations in the more remote areas of the state.

MAXIMUS provides an array of services to ensure that beneficiaries receive accurate information regarding enrollment into medical and dental plans (health plans) serving their areas. Beneficiaries receive assistance in selecting health plans and providers, and are educated on how to access health plan services and resolve problems should any arise. Enrollment and disenrollment services are consistently offered in a rapid and professionally appropriate manner.