(Bloomberg) -- Anthem Inc. is suing Express Scripts Holding Co.

It is seeking to recover excess payments the health insurer said it made for drugs from the pharmacy benefits manager.

The suit, which Anthem said it filed in the U.S. District Court for the Southern District of New York, deepens the dispute between the firms.

Anthem has said it should be getting $3 billion a year more in prescription drug savings from Express Scripts, while Express Scripts has disputed that claim.

Read: UnitedHealth takes on CVS, Express Scripts with deal

Express Scripts shares fell 3.2 percent to $67.25 at 11:14 a.m. in New York, reversing gains from earlier in the day.

Read: Express Scripts covers $1 alternative to Turing's pill

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