Regulators in Oregon and California have quietly directed some health insurance companies to stop denying coverage for transgender patients because of their gender identity.

The states aren't requiring coverage of specific medical treatments. But they told some private insurance companies they must pay for a transgender person's hormone therapy, breast reduction, cancer screening or any other procedure deemed medically necessary if they cover it for patients who aren't transgender.

The changes apply to companies insuring about a third of Oregonians and about 7 percent of Californians, but not to people on Medicare and Medicaid or to the majority of Californians who are insured through a health management organization, or HMO.