Steward Health Care System has cancelled its contract with Cambridge-based health insurer Senior Whole Health, effective Jan. 1, meaning it will no longer assign its staff doctors to treat about 900 low-income patients who are plan members. Under a state law passed in 2000, low-income seniors who qualify for both Medicaid and Medicare -- the government health insurance for the poor and elderly -- can be insured through senior care option plans, which allows them to carry one insurance card rather than two.
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