Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. Tracy A. Newkirk, M.D.

Neurology Physician in Greenbrae,, CA · enumerated 2006.

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

National Provider Identifier

1477630259

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Registry record

Entity type Individual (Type 1)

Name Mr. Tracy A. Newkirk

Credential M.D.

Sex Male

Practice address Greenbrae,, CA, 94904

Phone (415) 461-2262

Fax (415) 461-2262

Enumeration date Nov 1, 2006

Last updated in NPPES Aug 3, 2015

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 0C33431 (CA) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1477630259 active?

Yes, as of the latest NPPES snapshot, NPI 1477630259 is active (record last updated 2015-08-03).

How do I verify Tracy Newkirk's NPI record?

Cross-check NPI 1477630259 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-08-03.