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

John S. Gilliam, MD

Individual provider Emergency Medicine Physician · NPI 1003877085

John S. Gilliam, MD is a Family Practice in Mayer, Arizona. Graduated from Oral Roberts University School of Medicine in 1986, 40 years ago. Practices with Carelock LLC, a 14-clinician group and accepts Medicare assignment. Licensed in Arizona and Oklahoma.

Years since qualifying
40
Trained at
Oral Roberts University School of Medicine
Licensed in
AZ, OK
In the registry since
2006
Specialties on file
2
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

20172 E Stagecoach Trl
Mayer, AZ 86333-2357
Phone: (800) 288-6206
Fax: (800) 960-4547
Show map & directions

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

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 41469 (AZ)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 16226 (OK)

Record details

NPI number1003877085
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 30, 2006
Last updated in NPPESJuly 1, 2020
Certification dateJuly 1, 2020
Mailing address15029 N Thompson Peak Parkway, Ste B-111 Pmb 438, Scottsdale, AZ 85260-2223

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolORAL ROBERTS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1986 (40 years in practice)
Group practice Carelock Llc — 14 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount