Diana A. Santiago, MD

Medicare activity in 2024

Official CMS public-use data for Diana A. Santiago, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Ct guidance for insertion of radiation therapy fields (77014)722 services
2. Radiation treatment management, 5 treatment sessions (77427)213 services
3. Calculation of radiation therapy dose (77300)147 services
4. Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy (G6002)128 services
5. Design and construction of complex radiation treatment device (77334)85 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
• High cholesterol65%
• Arthritis39%
• Ischemic heart disease31%
• Chronic kidney disease27%

Hospitals where Diana A. Santiago works

Medicare's Facility Affiliation Data lists Diana A. Santiago at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Piedmont Fayette HospitalFayetteville, GA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 110215
• Piedmont Hospital, IncAtlanta, GA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 110083
• Piedmont Newnan Hospital, IncNewnan, GA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 110229

Practice locations

Addresses where Diana A. Santiago is enrolled with Medicare (CMS data updated October 2, 2026).

• 1255 Hwy 54 WFayetteville, GA 30214 (770) 719‑7071
• 745 Poplar RdNewnan, GA 30265 (770) 254‑9600

Group practices

Medicare enrollment lists Diana A. Santiago as a member of this group (CMS data updated October 2, 2026).

• Therapeutic Radiation Oncology, PC8 clinicians in the group

Specialties

• Radiation Oncologyprimary

Find other Radiation Oncology doctors in Georgia →

Other radiation oncologists in Fayetteville

Clinicians with the same Medicare primary specialty in Fayetteville, GA — not a recommendation.

• Christopher J. Williamson, MD
• Charles Woods Iii, MD
• Adam W. Nowlan, MD

All radiation oncologists in Fayetteville →

Other clinicians in Therapeutic Radiation Oncology, PC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Christopher J. Williamson, MD
• Kim V. Neisler, MD
• Charles Woods Iii, MD
• Sasha H. Wahab, MD
• John H. Giesler, MD
• Geetha S. Rao, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians