Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Zachary Jacob Greenstein, DO

Individual provider Critical Care Medicine (Internal Medicine) Physician · NPI 1174151872

Zachary Jacob Greenstein, DO is an Internal Medicine in New York, New York. Qualified in 2020, 6 years ago. Practices with North Shore-Lij Medical PC, a 6,350-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
6
Licensed in
NY
In the registry since
2020
Specialties on file
2
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

100 E 77th St
New York, NY 10075-1850
Phone: (212) 434-2000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Critical Care Medicine (Internal Medicine) Physician (primary) Taxonomy 207RC0200X · Licence 323643 (NY)
Pulmonary Disease Physician Taxonomy 207RP1001X · Licence 323643 (NY)

Record details

NPI number1174151872
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 29, 2020
Last updated in NPPESApril 28, 2026
Certification dateApril 28, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Group practice North Shore-Lij Medical Pc — 6350 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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