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

John Harold Giesler, MD

Individual provider Radiation Oncology Physician · NPI 1649261926

John Harold Giesler, MD is a Radiation Oncology in Riverdale, Georgia. Graduated from Ohio Medical University in 1987, 39 years ago. Practices with Therapeutic Radiation Oncology, PC, an 8-clinician group and accepts Medicare assignment. Licensed in Georgia.

Years since qualifying
39
Trained at
Ohio Medical University
Licensed in
GA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

255 Professional Ct
Riverdale, GA 30274-2531
Phone: (770) 997-8424
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 35882 (GA)

Record details

NPI number1649261926
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 4, 2005
Last updated in NPPESJuly 15, 2010

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolOHIO MEDICAL UNIVERSITY
Graduated 1987 (39 years in practice)
Group practice Therapeutic Radiation Oncology, Pc — 8 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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