Absolute Collection Service, also known as ACS, is a full-service billing and debt collection firm. Founded in 1987, the company has more than 250 employees who provide various collection techniques that include a personalized letter series, skip tracing and credit bureau reporting. Absolute Collection Service and its affiliate companies provide consulting services for over 650 health care clients nationwide. It offers primary and secondary insurance filing services, as well as insurance follow up and verification programs. The company provides online bill payment services. It offers temporary staffing, operational assessment and contract management services. In addition, the company provides data warehousing and data mining, contract analysis and data archive services.