Highmark could soon be in good company in suing the federal government over Affordable Care Act reimbursement.

Other insurers have contacted Highmark since the Pittsburgh carrier filed a lawsuit Tuesday over reimbursement for losses incurred in providing coverage under the ACA, president and CEO David Holmberg said Wednesday. The companies are weighing their options to recoup billions of dollars they say are owed, he said.

“The losses were pretty significant,” Mr. Holmberg said. “We ended up with the other companies standing here holding the bag. We saw no path forward.”

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Highmark Health is cutting reimbursement to doctors by 4 percent effective April 1 for care provided to patients with health insurance bought through the government exchange — the latest effort to trim losses in a market segment that has caused headaches for carriers nationwide.

All Pennsylvania doctors who participate in Highmark’s health insurance plans and treat patients with coverage required by the Affordable Care Act will be affected by the reimbursement cut, said Alexis Miller, senior vice president of individual and small group markets.

The doctors’ pay cut is needed to stem losses in individual health-law coverage as the insurer looks for other ways to stop the bleeding, Ms. Miller said.