Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Patrick K Siu, M.D.

Internal Medicine Physician in Camarillo, CA · enumerated 2006.

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

National Provider Identifier

1629005475

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Registry record

Entity type Individual (Type 1)

Name Dr. Patrick K Siu

Credential M.D.

Sex Male

Practice address 422 Arneill Rd Ste B, Camarillo, CA, 93010

Phone (805) 383-4510

Fax (805) 383-4511

Enumeration date Jun 27, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

207PE0004X Emergency Medical Services (Emergency Medicine) Physician Allopathic & Osteopathic Physicians · License MD 4738 (HI) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License G86731 (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
01348502	Medicaid	HI	-
RHM08609F	Medicaid	CA	-
D0014375	Other	HI	SHIELD/HMSA
050394	Other	CA	BLUE CROSS
RHM18553H	Medicaid	CA	-
RHM08608F	Medicaid	CA	-
ZZT40394F	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

Is NPI 1629005475 active?

Yes, as of the latest NPPES snapshot, NPI 1629005475 is active (record last updated 2025-09-11).

How do I verify Patrick Siu's NPI record?

Cross-check NPI 1629005475 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Catherine Kim Family Medicine Physician · Camarillo, CA NPI 1497819809 Debra Ouyang Endocrinology, Diabetes & Metabolism Physician · Camarillo, CA NPI 1174753826 Hoang-Anh Pham Pediatrics Physician · Camarillo, CA NPI 1790041267 Dorothy Du Graff Family Medicine Physician · Camarillo, CA NPI 1699180935 Thanh-Van Mai Family Medicine Physician · Camarillo, CA NPI 1528552411 Alicia Mouwen Family Medicine Physician · Camarillo, CA NPI 1619524824

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.