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

DR. JOHN MICHAEL LAZARUS M.D.
NPI 1528064011
Internal Medicine - Nephrology in Lexington, MA

Q: What is John Lazarus's NPI number?

The NPI number for John Lazarus is 1528064011. It was assigned to this individual provider in the NPPES registry on June 21, 2005.

Q: What is John Lazarus's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Q: When was this NPI record last updated?

The NPPES record for John Lazarus 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 26 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 June 21, 2005

95 HAYDEN AVE, LEXINGTON, MA 02421(781) 402-9000(781) 402-9582 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About Dr. John Michael Lazarus M.d. NPPES

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

DR. JOHN MICHAEL LAZARUS M.D. (NPI 1528064011) is an individual nephrology provider in Lexington, Massachusetts, licensed in Massachusetts (32449) and active in the NPI registry since June 2005.

NPPES Registry Identity

NPI1528064011

Entity TypeIndividualMale

Primary Taxonomy207RN0300X

Provider Legal NameDR. JOHN MICHAEL LAZARUSCredential: M.D.

Location Address95 HAYDEN AVELexington, MA 02421-7942

Mailing Address60 Old Colony RdWellesley Hills, MA 02481-2844 · (781) 237-2528

Phone(781) 402-9000

Fax(781) 402-9582

Sole ProprietorNo

Enumeration DateJune 21, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1528064011 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians

Taxonomy Code207RN0300X

License✔ Licensed in MA · 32449

Definition

An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.

95 HAYDEN AVE, Lexington, MA 02421

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Other Identifiers 1

Medicaid2001764MA

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. EDUARDO K LACSON JR. M.D., M.P.H.

Internal Medicine (Nephrology)

95 HAYDEN AVE
LEXINGTON, MA 02421

Middlesex County (781) 402-9000

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 John Lazarus's NPI number?

The NPI number for John Lazarus is 1528064011. It was assigned to this individual provider in the NPPES registry on June 21, 2005.

Where is John Lazarus located?

John Lazarus practices at 95 Hayden Ave, Lexington, MA 02421. The listed phone number is (781) 402-9000.

What is John Lazarus's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

When was this NPI record last updated?

The NPPES record for John Lazarus 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 26 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.