Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. John S Greely, MD

Individual provider Internal Medicine Physician · NPI 1922091842

Dr. John S Greely, MD is an Internal Medicine in New York, New York. Graduated from University of Texas Southwestern Medical School at Dallas in 1992, 34 years ago. Practices with Icahn School of Medicine at Mount Sinai, a 2,791-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in New York.

Years since qualifying
34
Trained at
University of Texas Southwestern Medical School at Dallas
Licensed in
NY
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1090 Amsterdam Ave 4th Fl
New York, NY 10025-1737
Phone: (212) 961-5500
Fax: (212) 531-4590
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 1000 10th Ave, New York, NY 10019-1147 — (212) 523-4000
  • 1111 Amsterdam Ave, New York, NY 10025-1716 — (212) 523-4000
  • 2771 Frederick Douglass Blvd, New York, NY 10039-3027 — (212) 690-0303

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 200383 (NY)
Internal Medicine Physician Taxonomy 207R00000X · Licence 200383 (NY)

Record details

NPI number1922091842
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 25, 2005
Last updated in NPPESMay 25, 2021
Certification dateMay 25, 2021

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL SCHOOL AT DALLAS
Graduated 1992 (34 years in practice)
Group practice Icahn School Of Medicine At Mount Sinai — 2791 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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