Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Geraldine C. Diaz, DO

Individual provider Anesthesiology Physician · NPI 1003987967

Dr. Geraldine C. Diaz, DO practises Anesthesiology in Brentwood, New York. Graduated from Philadelphia College of Osteopathic Medicine in 2001, 25 years ago. Practices with Randn Anesthesia PLLC, a 32-clinician group and works from 6 locations. Licensed in Illinois and New York.

Years since qualifying
25
Trained at
Philadelphia College of Osteopathic Medicine
Licensed in
IL, NY
In the registry since
2006
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

601 Suffolk Ave
Brentwood, NY 11717-4309
Phone: (631) 231-4455
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (5)

  • 1740 W Taylor St Ste 3200w, Chicago, IL 60612-7232 — (312) 996-4020
  • 5841 S Maryland Ave, Chicago, IL 60637-1447 — (773) 926-1220
  • 5841 S Maryland Ave, Chicago, IL 60637-1447 — (773) 926-1220
  • 450 Clarkson Ave Ste 6, Brooklyn, NY 11203 — (718) 270-2331
  • 1500 William Floyd Pkwy, Shirley, NY 11967-1800 — (631) 205-9090

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence 225683 (NY)
Anesthesiology Physician Taxonomy 207L00000X · Licence 036126434 (IL)
Critical Care Medicine (Anesthesiology) Physician Taxonomy 207LC0200X · Licence 036126434 (IL)

Record details

NPI number1003987967
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedNovember 13, 2006
Last updated in NPPESJanuary 30, 2026
Certification dateJanuary 30, 2026

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolPHILADELPHIA COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 2001 (25 years in practice)
Group practice Randn Anesthesia Pllc — 32 clinicians
Accepts Medicare assignment Not indicated
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients562
Services billed 576 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Randn Anesthesia PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 32 clinicians in the practice; 4 are shown here.

Other providers in Brentwood