Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

LARRY NATHANSON M.D.
NPI 1811944556
Internal Medicine - Medical Oncology in Cambridge, MA

Q: What is Larry Nathanson's NPI number?

The NPI number for Larry Nathanson is 1811944556. It was assigned to this individual provider in the NPPES registry on May 28, 2006.

Q: What is Larry Nathanson's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Q: When was this NPI record last updated?

The NPPES record for Larry Nathanson was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 48 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since May 28, 2006

3 GRAY GDNS E, CAMBRIDGE, MA 02138(617) 547-5022 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

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About Larry Nathanson M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

LARRY NATHANSON M.D. (NPI 1811944556) is an individual medical oncology provider in Cambridge, Massachusetts, licensed in Massachusetts (26304) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1811944556

Entity TypeIndividualMale

Primary Taxonomy207RX0202X

Provider Legal NameLARRY NATHANSONCredential: M.D.

Location Address3 GRAY GDNS ECambridge, MA 02138-1401

Mailing Address3 Gray Gdns ECambridge, MA 02138-1401 · (617) 547-5022

Phone(617) 547-5022

Sole ProprietorNo

Enumeration DateMay 28, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1811944556 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RX0202X

License✔ Licensed in MA · 26304

Definition

An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

3 GRAY GDNS E, Cambridge, MA 02138

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Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Larry Nathanson's NPI number?

The NPI number for Larry Nathanson is 1811944556. It was assigned to this individual provider in the NPPES registry on May 28, 2006.

Where is Larry Nathanson located?

Larry Nathanson practices at 3 Gray Gdns E, Cambridge, MA 02138. The listed phone number is (617) 547-5022.

What is Larry Nathanson's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

When was this NPI record last updated?

The NPPES record for Larry Nathanson was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 48 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.