By state law, HMOs licensed to operate in the Commonwealth are required to submit annual reports to the DOH, which regulates their operation.
Annual reports cover data for the year prior to their filing.
Thus, the 1999 reports cover data from calendar year 1998. The directory only covers HMOs and does not cover other types of managed care organizations. Annual reports contain a variety of data. Due to the dynamic managed care market, some HMOs may change names through mergers with or acquisitions by other HMOs, or cease operation. Footnotes to the directory indicate HMOs that experienced organizational changes during 1997.