Four defendants, including a Long Island chiropractor, pleaded guilty Thursday in federal court in Brooklyn to conspiracy to commit health care fraud by submitting $4 million in false Medicare claims, officials said.

Queens health clinic owner Jeffrey Suh, 55, of Bayside, chiropractor Sophia Lin, 34, of Rocky Point, and two others each face up to 10 years in prison after being accused of carrying out the scam at Plaza Medi Group and New Plaza Group Inc., in Flushing, prosecutors said.

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They offered various free perks such as massages, lunches, cash-equivalent coupons and recreational classes to Medicare beneficiaries who would provide their Medicare numbers, see a physician, and allow claims to be submitted for therapy and chiropractic services that either weren't needed or weren't provided.

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Also pleading guilty Thursday were office manager Emily Shim, 40, of Flushing, and physical therapist Kang Young Chung, 42, of Woodside.