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

JOHN WARREN SULLIVAN MD
NPI 1275506578
Psychiatry & Neurology - Clinical Neurophysiology in Longmeadow, MA

Q: What is John Sullivan's NPI number?

The NPI number for John Sullivan is 1275506578. It was assigned to this individual provider in the NPPES registry on February 8, 2006.

Q: What is John Sullivan's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Clinical Neurophysiology, with taxonomy code 2084N0600X.

Q: When was this NPI record last updated?

The NPPES record for John Sullivan 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 25 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 February 08, 2006

175 DWIGHT RD, STE 301, LONGMEADOW, MA 01106(413) 737-4746(413) 565-2297 Get Directions Write a Review

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

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

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About John Warren Sullivan Md NPPES

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

JOHN WARREN SULLIVAN MD (NPI 1275506578) is an individual clinical neurophysiology provider in Longmeadow, Massachusetts, licensed in Massachusetts (35840) and active in the NPI registry since February 2006.

NPPES Registry Identity

NPI1275506578

Entity TypeIndividualMale

Primary Taxonomy2084N0600X

Provider Legal NameJOHN WARREN SULLIVANCredential: MD

Location Address175 DWIGHT RD, STE 301Longmeadow, MA 01106

Mailing Address175 Dwight Rd, Ste 301Longmeadow, MA 01106 · (413) 737-4746 · Fax (413) 565-2297

Phone(413) 737-4746

Fax(413) 565-2297

Sole ProprietorNo

Enumeration DateFebruary 8, 2006

Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration

✔ NPI 1275506578 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · Clinical NeurophysiologyAllopathic & Osteopathic Physicians

Taxonomy Code2084N0600X

License✔ Licensed in MA · 35840

Definition

Clinical Neurophysiology is a subspecialty with psychiatric or neurologic expertise in the diagnosis and management of central, peripheral, and autonomic nervous system disorders using combined clinical evaluation and electrophysiologic testing such as electroencephalography (EEG), electromyography (EMG), and nerve conduction studies (NCS).

Also ListedPsychiatry & Neurology · NeurologyTaxonomy 2084N0400X · License 35840 (MA)

175 DWIGHT RD, Longmeadow, MA 01106

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Other Providers at the Same Location NPPES 20

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

DR. DEBORAH JEAN HOADLEY M.D.

Internal Medicine (Infectious Disease)

175 DWIGHT RD, SUITE 203
LONGMEADOW, MA 01106

Hampden County (413) 567-0600

WESTERN MASS PROFESSIONAL GROUP

Counselor (Mental Health)

175 DWIGHT RD, SUITE 201
LONGMEADOW, MA 01106

Hampden County (413) 250-0830

BAYSTATE MENTAL HEALTH COUNSELING

Counselor (Mental Health)