Diego Valenzuela Inzunza
Physician Assistant · Castro Valley, CA
Diego Valenzuela Inzunza is a physician assistant with a practice address in Castro Valley, California, and NPI 1336617174, issued on Nov 9, 2018. Check the license (California 56818, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Diego Valenzuela Inzunza
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 56818 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20642 John Dr, Castro Valley, CA 94546
- Phone
- (510) 581-2559
- Enumerated
- Nov 9, 2018
- Record last updated
- Dec 17, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20191106002128); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 20642 John Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Diego Valenzuela Inzunza in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 56818Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average physician assistant in 2024
28 Medicare Part D claims for 19 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- County OF Santa ClaraSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Diego Valenzuela Inzunza among 14,451 physician assistant records in California
Diego Valenzuela Inzunza is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 52% of them.
- NPI issued2018 · 52% of these records are older, 44% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2018 · median 2018 among the 7,214 with a school on file
- Record last updated2021 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
28 physician assistant records list a practice address in Castro Valley
They are 28 of the 999 NPPES records with a practice address in Castro Valley, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Castro Valley → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Eric Bellfort, PACastro Valley, CA 945461073504403
- Cherie Clark, PA-CCastro Valley, CA 945461780992560
- Barry Clements, PA-CCastro Valley, CA 945461952392177
- Melissa Goralka, PACastro Valley, CA 945461891878740
- Jasmine Halloran, PACCastro Valley, CA 945461124090162
- Patti Hee, PA-CCastro Valley, CA 945461851439145
- Isaac Ibrahimi, PA-CCastro Valley, CA 945461588735849
- Shalini Jeyakumar, MPA, RPA-CCastro Valley, CA 945461801119995
Common questions
What is Diego Valenzuela Inzunza's NPI number?
Diego Valenzuela Inzunza's National Provider Identifier (NPI) is 1336617174, issued on Nov 9, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Diego Valenzuela Inzunza located?
The NPPES record lists a practice address at 20642 John Dr, Castro Valley, CA, 94546. Phone: (510) 581-2559. Providers update this record themselves, so call before visiting.
How can I verify Diego Valenzuela Inzunza's license?
NPPES lists California license number 56818, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Diego Valenzuela Inzunza prescribe under Medicare Part D?
In 2024, Diego Valenzuela Inzunza had 28 Medicare Part D claims for 19 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.