AmSurg Corp.'s (Nasdaq: AMSG) physician services unit, Sheridan, has closed a deal for Radiology Associates of Hollywood PA.

Consolidation among doctor groups is driven by the need make health care more cost-effective as the Affordable Care Act brings more patients into the health care system. For more, see ACA Reshuffles the Deck

Radiology Associates, headquartered in Hollywood, Florida, boasts more than 50 sub-specialty trained radiologists that provide services to hospitals and imaging facilities in Florida. The deal allows Sheridan to expand its radiology business in South Florida.

Sheridan provides outsourced physician services, including anesthesiology, children's services, emergency medicine and radiology, to hospitals and other health care facilities. AmSurg also operates an ambulatory services business that buys, develops and operates ambulatory surgery centers in partnership with physician groups in the U.S.

AmSurg bought Sheridan for $2.35 billion in July. 

AmSurg is not the only business bulking up with outsourced physician services. Mednax Inc. (NYSE: MD) has been acquiring companies in that space for years. In January, Mednax acquired Memac Associates PC as it continues to expand its anesthesiology physician group.