Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Warren David Johnston, MD

Cardiovascular Disease Physician in Orange, CA · enumerated 2005.

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

National Provider Identifier

1427052802

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Registry record

Entity type Individual (Type 1)

Name Warren David Johnston

Credential MD

Sex Male

Practice address 1140 W La Veta Ave Ste 430, Orange, CA, 92868

Phone (714) 543-5555

Fax (714) 836-2427

Enumeration date Jun 13, 2005

Last updated in NPPES Nov 3, 2021

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License G33255 (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
DB3373	Other	CA	RAILROAD MEDICARE
W13988A	Other	CA	MEDICARE PTAN
060041547	Other	CA	RAILROAD MEDICARE
W13988	Other	CA	MEDICARE PTAN
00G332550	Medicaid	CA	-

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 Warren Johnston's NPI record?

Cross-check NPI 1427052802 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1427052802 active?

Yes, as of the latest NPPES snapshot, NPI 1427052802 is active (record last updated 2021-11-03).

Other providers at this practice address

Browse all →

Donald Mahon Cardiovascular Disease Physician · Orange, CA NPI 1255335659 Thomas Kim Specialist · Orange, CA NPI 1144225301 Michael Chan Interventional Cardiology Physician · Orange, CA NPI 1487660833 Danny Lee Clinical Cardiac Electrophysiology Physician · Orange, CA NPI 1740568427 Erum Bajwa Cardiovascular Disease Physician · Orange, CA NPI 1184069239 Allysha Varughese Physician Assistant · Orange, CA NPI 1316430754 Robert Pedicini Cardiovascular Disease Physician · Orange, CA NPI 1992264840 Aileen Jiras Medical Physician Assistant · Orange, CA NPI 1063054641

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-11-03.