Baystate Health is a not-for-profit integrated health system headquartered in Springfield, Massachusetts, serving Western Massachusetts and the Knowledge Corridor Region of Massachusetts and Connecticut. The system has 4 hospitals, over 80 medical practices, and 25 reference laboratories. With 12,000 employees including 1,600 physicians, Baystate Health is one of Massachusetts' largest employers. Baystate also owns the for-profit insurer Health New England. In 1974, Springfield Hospital Medical Center merged Wesson Womens Hospital to create the 672-bed Medical Center of Western Massachusetts. In 1976, the Medical Center of Western Massachusetts merged with Wesson Memorial Hospital. The merger established Baystate Medical Center, then the second-largest hospital in New England, with 1,036 beds. In 1983, Baystate Medical Center was reorganized into three separate corporations: Baystate Health Systems, the parent corporation now renamed Baystate Health; Baystate Medical Center; and the for-profit corporation Baystate Diversified Health Services. The reorganization provided a legal framework for developing a future multi-institutional health care system and for reducing the assets that would be encumbered with the financing of a major new hospital building.