Gregory De Fazio, MD

Medicare activity in 2024

Official CMS public-use data for Gregory De Fazio, 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. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)103 services
2. Screening papanicolaou smear; obtaining, preparing and conveyance of cervical or vaginal smear to laboratory (Q0091)48 services
3. Cervical or vaginal cancer screening; pelvic and clinical breast examination (G0101)44 services
4. Telephone medical discussion with physician, 5-10 minutes (99441)22 services
5. Telephone medical discussion with physician, 11-20 minutes (99442)21 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%
• High cholesterol75%
• Arthritis56%
• Diabetes51%
• Anxiety25%
• Osteoporosis22%

Hospitals where Gregory De Fazio works

Medicare's Facility Affiliation Data lists Gregory De Fazio 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.

• Staten Island University HospitalStaten Island, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330160

Practice locations

Addresses where Gregory De Fazio is enrolled with Medicare (CMS data updated October 2, 2026).

• 1301 82nd StBrooklyn, NY 11228 (718) 836‑3721

Group practices

Medicare enrollment lists Gregory De Fazio as a member of this group (CMS data updated October 2, 2026).

• De Fazio Obstetrics and Gynecology PC2 clinicians in the group

Specialties

• Obstetrics/Gynecologyprimary

Find other Obstetrics/Gynecology doctors in New York →

Other OB-GYNs in Brooklyn

Clinicians with the same Medicare primary specialty in Brooklyn, NY — not a recommendation.

• Lauren E. Barlog, MD
• Sandra McCalla, MD
• Guy S. Etienne, MD
• Lim H. Tse, MD
• Bernice S. Li, MD
• Garrick H. Leonard, MD
• Seongpan Si, MD
• Mark Defazio, MD

All OB-GYNs in Brooklyn →

Other clinicians in De Fazio Obstetrics and Gynecology PC

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

• Mark Defazio, 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