Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John E Massey, MD

Pain Medicine (Anesthesiology) Physician in Los Gatos, CA · enumerated 2007.

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

National Provider Identifier

1619003415

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Registry record

Entity type Individual (Type 1)

Name John E Massey

Credential MD

Sex Male

Practice address 15047 Los Gatos Blvd, Ste 200, Los Gatos, CA, 95032

Phone (408) 364-6799

Fax (408) 378-4510

Enumeration date Feb 26, 2007

Last updated in NPPES Mar 19, 2009

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License G76734 (CA) Secondary

207LP2900X Pain Medicine (Anesthesiology) Physician Allopathic & Osteopathic Physicians · License G76734 (CA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
ZZZ23054Z	Other	CA	MEDICARE PTAN

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 1619003415 active?

Yes, as of the latest NPPES snapshot, NPI 1619003415 is active (record last updated 2009-03-19).

How do I verify John Massey's NPI record?

Cross-check NPI 1619003415 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-03-19.