RDMS) Registered Diagnostic Medical Sonographer, or (RDMS-AB) RDMS Abdomen Specialty, or (RDMS-OB/GYN) RDMS Obstetrics & Gynecology, or Vocational School Graduate, or Associate Degree, or Certificate. In recent years, HCA Healthcare spent an estimated $3.7 billion in cost for the delivery of charitable care, uninsured discounts, and other uncompensated expenses.