Apria Healthcare Group Inc., one of the biggest U.S. home health-care providers, said federal prosecutors have closed a criminal probe of its billing practices without filing charges. Apria said a year ago that the U.S. attorney's office in Sacramento had served the company with six subpoenas for information on its billing practices. The U.S. attorney's office later served it with two more subpoenas. The Costa Mesa-based company is still dealing with other legal challenges, though. Apria has been the subject of two subpoenas by the U.S. attorney's office in San Diego seeking information on its billing practices. Apria is responding to a subpoena from the federal Health and Human Services Department. Apria shares rose $1.88 to close at $18.88 on the New York Stock Exchange.