Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Thompson, MD

Neurological Surgery Physician in New York, NY · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1427043454

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Registry record

Entity type Individual (Type 1)

Name Mark Thompson

Credential MD

Sex Male

Practice address 400 E 71st St, Apt 11e, New York, NY, 10021

Phone (212) 327-1958

Fax (212) 327-1956

Enumeration date Sep 15, 2005

Last updated in NPPES Mar 26, 2018

Taxonomy & licenses

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 208307-1 (NY) Secondary

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 4301097635 (MI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify Mark Thompson's NPI record?

Cross-check NPI 1427043454 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1427043454 active?

Yes, as of the latest NPPES snapshot, NPI 1427043454 is active (record last updated 2018-03-26).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-03-26.