Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mr. William Aaron Kay, MD

Individual provider Adult Congenital Heart Disease Physician · NPI 1700094307

Mr. William Aaron Kay, MD is an Internal Medicine in Fairfield, Ohio. Graduated from Indiana University School of Medicine in 2004, 22 years ago. Practices with Mercy Health Physicians Cincinnati Specialty Care LLC, a 344-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Indiana and Ohio.

Years since qualifying
22
Trained at
Indiana University School of Medicine
Licensed in
IN, OH
In the registry since
2007
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

3000 Mack Rd Ste 100
Fairfield, OH 45014-5335
Phone: (513) 751-4222
Fax: (513) 874-3023
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 3900 St Francis Way Ste 200, Lafayette, IN 47905-4940 — (317) 962-9700

Specialties & licences

Adult Congenital Heart Disease Physician (primary) Taxonomy 207RA0002X · Licence 35.087717 (OH)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X · Licence 35.087717 (OH)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence 01072677A (IN)

Record details

NPI number1700094307
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 18, 2007
Last updated in NPPESNovember 20, 2023
Certification dateNovember 20, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2004 (22 years in practice)
Group practice Mercy Health Physicians Cincinnati Specialty Care Llc — 344 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount