AUGUSTA, Maine (AP) — A new law in Maine is designed to protect small pharmacies from unexpected charges from insurance companies.

The proposal, called “Act Act To Prohibit Health Insurance Carriers from Retroactively Reducing Payment on Clean Claims Submitted by Pharmacies,” was signed into law by Democratic Gov. Janet Mills on March 18. Supporters said it would stop insurance carriers and pharmacy benefit managers from charging pharmacies for fees related to claims that are not apparent at the time the insurance carrier processes the claim.

The new law will prevent the carriers from “clawing back” payments for clean prescription claims months later, supporters said.

Democratic Sen. Nate Libby of Lewiston, who proposed the law change, said the change will allow independent pharmacies to continue serving Maine communities.