Geraldine Diaz, D.O.
NPI 1003987967 · Anesthesiology Physician · Brentwood, NY
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Geraldine Diaz, D.O. is a Anesthesiology Physician provider in Brentwood, NY (NPI 1003987967).
Provider details
- NPI number
- 1003987967
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- No
- License
- 036126434 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
6 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
569 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Anesthesia for Lens Surgery00142 | 268 | $140 |
| Anesthesia for Other Procedure on Eye00140 | 197 | $160 |
| Anesthesia for Procedure on Eyelid00103 | 71 | $201 |
| Anesthesia for Retinal Surgery00145 | 21 | $225 |
| Anesthesia for Other Procedure on Skin, Muscles, Or Nerves of Head, Neck, and Upper Back00300 | 12 | $202 |
Typical Medicare-allowed amounts for these services range $140–$225 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (5)
- 1740 W Taylor St Ste 3200wChicago, IL 60612-7232Phone: (312) 996-4020
- 5841 S Maryland AveMc 4028Chicago, IL 60637-1447Phone: (773) 926-1220
- 5841 S Maryland AveMc 4028Chicago, IL 60637-1447Phone: (773) 926-1220
- 450 Clarkson Ave Ste 6Brooklyn, NY 11203Phone: (718) 270-2331
- 1500 William Floyd PkwyShirley, NY 11967-1800Phone: (631) 205-9090
Registry dates
- Enumerated
- 2006-11-13
- Last updated
- 2026-01-30
- Certified
- 2026-01-30
Frequently asked questions
- What is Geraldine Diaz's NPI number?
- Geraldine Diaz's National Provider Identifier (NPI) is 1003987967, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Geraldine Diaz's specialty?
- Geraldine Diaz is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Geraldine Diaz located?
- Geraldine Diaz's practice location on file with NPPES is 601 Suffolk Ave, Brentwood, NY 11717-4309.
- What is Geraldine Diaz's phone number?
- The practice phone number listed in the NPPES registry for Geraldine Diaz is (631) 231-4455.
- Does Geraldine Diaz accept Medicare?
- Geraldine Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Geraldine Diaz's NPI active?
- Yes — Geraldine Diaz's NPI (1003987967) is active in the NPPES registry as of the last update on 2026-01-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.