“We will continue to defend the right for patients to talk freely with their physicians about all their health care options,” Dr. Patrice A. Harris, president of the American Medical Association, said in an email.

The Trump administration has steadily shifted federal health programs toward conservative preferences like promoting abstinence in teen pregnancy prevention programs and allowing exemptions to insurance coverage of birth control for employers with religious objections.

Withdrawing from Title X will not deprive Planned Parenthood of all government funding, a longtime goal of many conservatives. Figures from Planned Parenthood’s 2017-18 annual report showed that the organization received about $500 million from Medicaid, the joint federal and state health care program for low income people. Federal funds cover most of that spending.

The immediate effect of a Planned Parenthood withdrawal is unclear and likely to vary by state. Hawaii, Illinois, New York, Oregon and Washington have said their states would not participate in Title X under the new rule. Legislatures in Massachusetts and Maryland have passed laws that essentially have the same effect. Planned Parenthood expects some of the states to make up some of the money.

The rule, announced in February, is being challenged in court by Planned Parenthood, other organizations and more than 20 states, but a federal appeals court in July said the policy change could take effect while the legal cases were pending.

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Planned Parenthood and some other organizations that receive Title X funds had decided to stop using the money until the legal challenges were resolved, although they had not officially withdrawn from the program.

The Department of Health and Human Services said that such an intermediate status would not be acceptable. It said that organizations had until Aug. 19 to submit an “assurance and action plan” showing they intend to make “good faith efforts” to comply with the new rule.