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

Dr. Leonidas Nikolaos Diamantopoulos, MD

Individual provider Internal Medicine Physician · NPI 1295358273

Dr. Leonidas Nikolaos Diamantopoulos, MD is a Hospitalist in New York, New York. Qualified in 2016, 10 years ago. Practices with North Shore-Lij Medical PC, a 6,350-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Minnesota and New York.

Years since qualifying
10
Licensed in
MN, NY
In the registry since
2020
Specialties on file
3
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

1 Gustave L Levy Pl # 1234
New York, NY 10029-6504
Phone: (212) 241-3678
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 200 1st St Sw, Rochester, MN 55905-0001 — (507) 284-2511
  • 375 Seguine Ave, Staten Island, NY 10309-3932 — (718) 226-9000
  • 3459 5th Ave Ste 9, Pittsburgh, PA 15213-3236 — (412) 692-4888

Specialties & licences

Nuclear Medicine Physician (primary) Taxonomy 207U00000X · Licence 329062 (NY)
Internal Medicine Physician Taxonomy 207R00000X · Licence 329062 (NY)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence 73326 (MN)

Record details

NPI number1295358273
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 25, 2020
Last updated in NPPESJune 24, 2026
Certification dateJune 24, 2026

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2016 (10 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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