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Utah Valley Regional Medical Center spokeswoman Janet Frank said Coleman, 42, was admitted to the Provo facility on Wednesday but she couldn't release any other details.
Coleman lives in Santaquin, which is 55 miles south of Salt Lake City.
The actor is best known for his stint on TV's "Diff'rent Strokes," which aired from 1978 to 1986.
In February, Coleman suffered a seizure on the set of "The Insider."
A telephone message left for Coleman's Utah attorney was not immediately returned Thursday.
Coleman has lived in Utah since 2005, when he came here to star in the movie "Church Ball," a comedy based on basketball leagues formed by members of The Church of Jesus Christ of Latter-day Saints. He met his wife, Shannon Price, on the movie set and married her in 2007.
Coleman has had a string of financial and legal problems, in addition to continuing ill health from the kidney disease he suffered as a child. Coleman has had at least two kidney transplants and has ongoing dialysis.
Last fall, Coleman had heart surgery that was complicated by pneumonia, his attorney Randy Kester has said.
In February, Coleman pleaded guilty to a misdemeanor criminal mischief charge related to an April 2009 domestic violence incident at his home.