An employee at a doctor's office used my husband's medical record to obtain my private cell phone number to send me harrassing texts.

The employee was wrong to use this information and wrong to send harassing texts to you. You can bring an action against this employee for the texts if they reach the level of harassment.  However, i believe that you cannot place any blame on the employer. You can put the employer on notice regarding the employee's wrongful conduct. You cannot hold the employer responsible for the employee's actions unles there was knowledge on the part of the employer. Ed Dimon