Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ronald W Thompson, MD

Radiation Oncology Physician in Santa Monica, CA · enumerated 2005.

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

National Provider Identifier

1427033646

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Registry record

Entity type Individual (Type 1)

Name Ronald W Thompson

Credential MD

Sex Male

Practice address 2121 Santa Monica Blvd, Santa Monica, CA, 90404

Phone (310) 829-8913

Fax (310) 315-6168

Enumeration date Dec 9, 2005

Last updated in NPPES Nov 16, 2020

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License G12376 (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
WG12376K	Other	CA	MEDICARE EL CEN
00G123760	Medicaid	CA	-
00G123761	Other	CA	MEDICARE TEM
WG12376F	Other	CA	MEDICARE SJHC
WG12376I	Other	CA	MEDICARE LCM
WG12376J	Other	CA	MEDICARE SAN PEDRO
WG12376C	Other	CA	MEDICARE VROC
00G123762	Other	CA	MEDICARE SBMC
G12376	Other	CA	MEDICAL LICENSE
WG12376G	Other	CA	MEDICARE - SJMC
00G123761	Other	CA	MEDICARE RIV

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 Ronald Thompson's NPI record?

Cross-check NPI 1427033646 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1427033646 active?

Yes, as of the latest NPPES snapshot, NPI 1427033646 is active (record last updated 2020-11-16).

Other providers at this practice address

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Lisa Chaiken Radiation Oncology Physician · Santa Monica, CA NPI 1528062023 Charles Louy Pain Medicine (Anesthesiology) Physician · Santa Monica, CA NPI 1275531717 Providence Saint John'S Health Center General Acute Care Hospital · Santa Monica, CA NPI 1124026273 Liv Hagstrom Surgical Physician Assistant · Santa Monica, CA NPI 1811986672 Steven Kolker Anatomic Pathology & Clinical Pathology Physician · Santa Monica, CA NPI 1598726457 Christopher Loh Diagnostic Radiology Physician · Santa Monica, CA NPI 1720044183 Isaac Bash Emergency Medicine Physician · Santa Monica, CA NPI 1619934643 Victor Candioty Emergency Medicine Physician · Santa Monica, CA NPI 1437116472

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-11-16.