Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. James Homer Ferguson, DO

Family Medicine Physician in Costa Mesa, CA · enumerated 2006 · practices at State of California - Department of Developmental Services.

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

National Provider Identifier

1689625212

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Registry record

Entity type Individual (Type 1)

Name Dr. James Homer Ferguson

Credential DO

Sex Male

Practice address 2501 Harbor Blvd, Costa Mesa, CA, 92626

Phone (714) 957-5000

Enumeration date May 16, 2006

Last updated in NPPES Mar 7, 2023

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 20A7415 (CA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
020A74150	Other	-	PIN

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

What specialty is James Ferguson?

James Ferguson is registered in NPPES with the primary taxonomy of Family Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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State of California - Department of Developmental Services General Acute Care Hospital · Costa Mesa, CA NPI 1225089592 Lilia Tan Figueroa Physical Medicine & Rehabilitation Physician · Costa Mesa, CA NPI 1023069655 Ronald Bangsil Family Medicine Physician · Costa Mesa, CA NPI 1043261654 Lucia Rusu Addiction Medicine (Family Medicine) Physician · Costa Mesa, CA NPI 1467404004 Hung Le Family Medicine Physician · Costa Mesa, CA NPI 1073565842 Dilip Patel Internal Medicine Physician · Costa Mesa, CA NPI 1053363820 Cuong Ha General Practice Physician · Costa Mesa, CA NPI 1962454736 Charlotte Russell Family Nurse Practitioner · Costa Mesa, CA NPI 1780636555

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.