Patrick K. Siu, M.D.
Internal Medicine Physician · Camarillo, CA
Patrick K. Siu, M.D. is an internal medicine physician with a practice address in Camarillo, California, and NPI 1629005475, issued on Jun 27, 2006. Check the license (California G86731, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Patrick K. Siu
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- G86731 CA
MD 4738 HI
Self-reported in NPPES; status is on the state search - Practice location
- 422 Arneill RD Ste B, Camarillo, CA 93010
- Phone
- (805) 383-4510
- Enumerated
- Jun 27, 2006
- Record last updated
- Sep 11, 2025
- Fax
- (805) 383-4511
- Medicaid IDs
- 01348502 HI
RHM08609F CA
RHM18553H CA
RHM08608F CA - Entity
- Type 1 · individual
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Patrick K. Siu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G86731Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Patrick K. Siu among 17,696 internal medicine physician records in California
Patrick K. Siu, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
26 internal medicine physician records list a practice address in Camarillo
They are 26 of the 2,656 NPPES records with a practice address in Camarillo, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,696 in California → Every provider in Camarillo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jeffrey Allan, MDCamarillo, CA 930101407870652
- Karen Fields, MDCamarillo, CA 930101497779656
- Afrouz Gerayli, MDCamarillo, CA 930101801044839
- Christopher Hynum, M.D.Camarillo, CA 930101588722573
- Ragaa Ibrahim, M.D.Camarillo, CA 930101730128364
- Gary Lieb, M.D.Camarillo, CA 930101912935396
- Bennet Lipper, MDCamarillo, CA 930101235129420
- Paul Morin, M.D.Camarillo, CA 930101932148525
Common questions
What is Patrick K. Siu, M.D.'s NPI number?
Patrick K. Siu, M.D.'s National Provider Identifier (NPI) is 1629005475, issued on Jun 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Patrick K. Siu, M.D. located?
The NPPES record lists a practice address at 422 Arneill RD Ste B, Camarillo, CA, 93010. Phone: (805) 383-4510. Providers update this record themselves, so call before visiting.
How can I verify Patrick K. Siu, M.D.'s license?
NPPES lists California license number G86731, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.