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

Dr. Gregory J Adamson, M.D.

Sports Medicine (Orthopaedic Surgery) Physician in Pasadena, CA · enumerated 2005.

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

National Provider Identifier

1972590610

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory J Adamson

Credential M.D.

Sex Male

Practice address Pasadena, CA, 91105

Phone (626) 795-8051

Fax (626) 795-0356

Enumeration date Sep 27, 2005

Last updated in NPPES Mar 4, 2024

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

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License G58923 (CA) Secondary

207XX0005X Sports Medicine (Orthopaedic Surgery) Physician Allopathic & Osteopathic Physicians · License G58923 (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
G58923	Other	CA	MEDICARE INDIVIDUAL ID
200011897	Other	CA	RAIL ROAD MEDICARE

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 Gregory Adamson's NPI record?

Cross-check NPI 1972590610 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1972590610 active?

Yes, as of the latest NPPES snapshot, NPI 1972590610 is active (record last updated 2024-03-04).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-03-04.