What is Patrick Siu's NPI number?

Patrick Siu's National Provider Identifier (NPI) is 1629005475, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Patrick Siu's specialty?

Patrick Siu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Patrick Siu located?

Patrick Siu's practice location on file with NPPES is 422 Arneill Rd Ste B, Camarillo, CA 93010-6434.

What is Patrick Siu's phone number?

The practice phone number listed in the NPPES registry for Patrick Siu is (805) 383-4510.

Is Patrick Siu's NPI active?

Yes — Patrick Siu's NPI (1629005475) is active in the NPPES registry as of the last update on 2025-09-11.

IndividualActive

Patrick Siu, M.D.

NPI 1629005475 · Internal Medicine Physician · Camarillo, CA

Patrick Siu, M.D. is a Internal Medicine Physician provider in Camarillo, CA (NPI 1629005475).

Provider details

NPI number: 1629005475
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Male
Sole proprietor: No
License: MD 4738 (HI)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense G86731 (CA)
Allopathic & Osteopathic Physicians
Emergency Medical Services (Emergency Medicine) Physician207PE0004XLicense MD 4738 (HI)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(91/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
20 yrs in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

422 Arneill Rd Ste B

Camarillo, CA 93010-6434

Phone: (805) 383-4510

Fax: (805) 383-4511

Street-level locationGet directions

More CA providers

Mailing address

2705 Loma Vista Rd

Ventura, CA 93003-1581

Enumerated: 2006-06-27
Last updated: 2025-09-11

Frequently asked questions

What is Patrick Siu's NPI number?: Patrick Siu's National Provider Identifier (NPI) is 1629005475, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Patrick Siu's specialty?: Patrick Siu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
Where is Patrick Siu located?: Patrick Siu's practice location on file with NPPES is 422 Arneill Rd Ste B, Camarillo, CA 93010-6434.
What is Patrick Siu's phone number?: The practice phone number listed in the NPPES registry for Patrick Siu is (805) 383-4510.
Is Patrick Siu's NPI active?: Yes — Patrick Siu's NPI (1629005475) is active in the NPPES registry as of the last update on 2025-09-11.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.