Zachary Greenstein, DO
NPI 1174151872 · Critical Care Medicine (Internal Medicine) Physician · New York, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zachary Greenstein, DO is a Critical Care Medicine (Internal Medicine) Physician provider in New York, NY (NPI 1174151872).
Provider details
- NPI number
- 1174151872
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 323643 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-03-29
- Last updated
- 2026-04-28
- Certified
- 2026-04-28
Frequently asked questions
- What is Zachary Greenstein's NPI number?
- Zachary Greenstein's National Provider Identifier (NPI) is 1174151872, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zachary Greenstein's specialty?
- Zachary Greenstein is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Zachary Greenstein located?
- Zachary Greenstein's practice location on file with NPPES is 100 E 77th St, New York, NY 10075-1850.
- What is Zachary Greenstein's phone number?
- The practice phone number listed in the NPPES registry for Zachary Greenstein is (212) 434-2000.
- Does Zachary Greenstein accept Medicare?
- Zachary Greenstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zachary Greenstein's NPI active?
- Yes — Zachary Greenstein's NPI (1174151872) is active in the NPPES registry as of the last update on 2026-04-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.