Lewis also has been charged with a second count of retaliation alleging he made a threatening call to Boling at his home.
Lewis denies both charges. He said he is considering suing the hospital but has not filed any legal papers.
Houston police spokesman Gabe Ortiz said the department did not investigate the officer's role, and he declined to elaborate. Boling did not immediately respond to a request for comment given to the police department.
Some 11,000 U.S. law enforcement agencies use Tasers, which some experts say are increasingly being used as a convenient labor-saving device to control uncooperative people.
"The Taser itself is a legitimate law-enforcement tool," said Kirkham, the criminologist. "The problem is the abusive use of them. They're supposed to be only used to protect yourself or another person from imminent aggression and physical harm. They're overused now."
Associated Press writers Chris Duncan and Monica Rhor contributed to this report.