Joseph Michael Mashinchi, P.A.
Physician Assistant · Oakland, CA
Joseph Michael Mashinchi, P.A. is a physician assistant with a practice address in Oakland, California, and NPI 1184004913, issued on Jun 6, 2015. Check the license (California 52558, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Joseph Michael Mashinchi
- Credential
- P.A.
- Primary taxonomy
- Physician Assistant 363A00000X
- License numbers
- 52558 CA
PA52558 CA
Self-reported in NPPES; status is on the state search - Practice location
- 747 52ND St, Oakland, CA 94609
- Phone
- (510) 428-3238
- Enumerated
- Jun 6, 2015
- Record last updated
- Sep 18, 2025
- Medicare enrollment
- Enrolled (PECOS I20150831000024); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 747 52ND St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Pallavi Agarwal, MD, MBBSPediatrics Physician1710595053
- Anurag Agrawal, MDPediatric Hematology & Oncology Physician1346485026
- Javier AguayoStudent in an Organized Health Care Education/Training Program1104527316
- Monica AguilarStudent in an Organized Health Care Education/Training Program1770276990
Verify Joseph Michael Mashinchi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 52558Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average physician assistant in 2024
135 Medicare Part D claims for 88 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 77 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen52 claims
- Doxycycline Hyclate11 claims
- Oxycodone-Acetaminophen11 claims
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.
Industry payments in 2024: $21.74
1 payment: food and beverage; the largest payer was Bioventus LLC. The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Northbay Physicians Surgery Center, LLCFairfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph Michael Mashinchi among 14,451 physician assistant records in California
Joseph Michael Mashinchi, P.A. 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 2015, is newer than 41% of them.
- NPI issued2015 · 41% of these records are older, 56% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2015 · median 2018 among the 7,214 with a school on file
- Record last updated2025 · 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).
Physician Assistant providers in California
There are 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Oakland → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Joel Ambrosio, PA-COakland, CA 946091154628105
- Miranda Bassilios, PA COakland, CA 946091609831114
- Erin Cava, PA-C, RDOakland, CA 946091225351620
- Cheryl Eldridge, PA-COakland, CA 946091336246438
- Ronald Grant, P.A.Oakland, CA 946091740245190
- Jane Hysen, PAOakland, CA 946091538133731
- Christa Kong, P.A.Oakland, CA 946091487813697
- Alexandra Mead, PA-COakland, CA 946091730286832
Common questions
What is Joseph Michael Mashinchi, P.A.'s NPI number?
Joseph Michael Mashinchi, P.A.'s National Provider Identifier (NPI) is 1184004913, issued on Jun 6, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Michael Mashinchi, P.A. located?
The NPPES record lists a practice address at 747 52ND St, Oakland, CA, 94609. Phone: (510) 428-3238. Providers update this record themselves, so call before visiting.
How can I verify Joseph Michael Mashinchi, P.A.'s license?
NPPES lists California license number 52558, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Joseph Michael Mashinchi, P.A. prescribe under Medicare Part D?
In 2024, Joseph Michael Mashinchi, P.A. had 135 Medicare Part D claims for 88 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.