Ramon Garcia, of Philadelphia, was arrested in April.
The assaults happened at Carbon Health Urgent Care facilities in the Jenkintown section of Abington Township, Pa.
Police say Garcia was a medical assistant who performed unauthorized pelvic exams. His actual duties included signing in patients, taking vital signs, and taking blood samples only if directed by a physician.
In one case, Garcia also allegedly made verbal advances, asking a victim if she was in a relationship and if she had any fantasies.
Garcia faces 5 to 10 years in prison when he's sentenced.
At the time of Garcia's arrest, Carbon Health Urgent Care said it was "fully cooperating with law enforcement" and said the "safety, well-being, and trust of our patients are our highest priorities."