Attorneys for Chamorro appeared before Goldsmith on Thursday seeking a preliminary injunction.
Health care provider Dignity Health, which operates Mercy Medical, also says the tubal ligation Chamorro seeks is not medically necessary.
A Northern California Catholic hospital is not engaging in sex discrimination by denying a woman's request for the sterilization procedure known as tubal ligation, a San Francisco judge said in a tentative ruling.
Superior Court Judge Ernest Goldsmith said in his decision Wednesday that Rebecca Chamorro could get the procedure at another hospital, and that Mercy Medical Center's policy against sterilization on religious ground also applies to men.
Health care provider Dignity Health, which operates Mercy Medical and 38 other hospitals in California, Nevada and Arizona, says the tubal ligation sought by Chamorro is not medically necessary and would violate the hospital's right to freedom of religion.
"The jurisprudence is unequivocal: A Catholic hospital may prohibit sterilization procedures that violate the core principles of the hospital's faith," attorneys for Dignity Health wrote in a court filing.
The judge issued the ruling in advance of a hearing on the matter. Attorneys representing Chamorro in her lawsuit were set to appear before Goldsmith on Thursday to try to change his mind and issue a preliminary injunction.
Chamorro is currently on bedrest at her home and scheduled to deliver by cesarean section later this month. The ideal time, medically, for a woman to have a tubal ligation, commonly known as having one's "tubes tied," is at the point of delivery. The next nearest hospital where Chamorro could have the procedure done is in Chico, 70 miles from her home.
Chamorro's suit is part of a growing clash over birth control and abortion health care coverage. Dozens of U.S. Roman Catholic dioceses, charities and colleges have sued in federal court over the contraceptive coverage required under the federal Affordable Care Act.
Several evangelical nonprofits have also sued, arguing some of the birth control methods covered under the law are tantamount to abortion.
Last June, the U.S. Supreme Court ruled that the Hobby Lobby chain and other closely held private businesses with religious objections could opt out of the birth control mandate.
The ACLU has filed a complaint against a Michigan Catholic hospital that also refused to perform tubal ligation, according to Brigitte Amiri, a senior staff attorney with the ACLU. She said the woman in that case was able to go to another hospital.
Chamorro sued to get the procedure done immediately following her scheduled cesarean section on Jan. 28 because she and her husband do not want more children.
Chamorro's attorneys, including the American Civil Liberties Union, say the procedure is safest when performed immediately after birth, and Chamorro has no choice but to use Mercy Medical Center because Redding is about 200 miles north of San Francisco and the next closest hospital she could go to is more than 70 miles away.
The lawsuit accuses Dignity Health of violating California laws against sex discrimination and the practice of medicine by corporations, pointing out that Chamorro's obstetrician had sought permission from Mercy Medical to perform the procedure.
The ACLU says the hospital allowed another woman to undergo a tubal ligation after the ACLU threatened a lawsuit.