Barry Jon Massirio, PA-C
Physician Assistant · Bakersfield, CA
Barry Jon Massirio, PA-C is a physician assistant with a practice address in Bakersfield, California, and NPI 1922000355, issued on Aug 15, 2005. Check the license (California PA12341, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Barry Jon Massirio
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA12341 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4580 California Ave, Bakersfield, CA 93309
- Phone
- (661) 327-4411
- Enumerated
- Aug 15, 2005
- Record last updated
- Jul 11, 2013 (not updated in 13 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 4580 California Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Lisa Banks, D.P.M.Podiatrist1992945885
- Jason Barca, PHARMDAmbulatory Care Pharmacist1558838078
- Rodney Beaty, PA-CPhysician Assistant1497747596
- Suzanne Bryan, PA-CPhysician Assistant1780686139
- Jeffrey Chen, D.O.Internal Medicine Physician1952749186
Verify Barry Jon Massirio in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA12341Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average physician assistant in 2024
36 Medicare Part D claims for 18 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.
Barry Jon Massirio among 14,451 physician assistant records in California
Barry Jon Massirio, PA-C 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 99% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2013 · 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).
165 physician assistant records list a practice address in Bakersfield
They are 165 of the 11,539 NPPES records with a practice address in Bakersfield, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Bakersfield → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Rodney Beaty, PA-CBakersfield, CA 933091497747596
- Suzanne Bryan, PA-CBakersfield, CA 933091780686139
- Liza Chen, PA-CBakersfield, CA 933091043294275
- Ryan Drury, P.A.Bakersfield, CA 933091477734283
- Linda Findley, P.A.-CBakersfield, CA 933091295850691
- Emily Fish, PA-CBakersfield, CA 933091205027299
- Anita Garrett, P.A.-CBakersfield, CA 933091962527366
- Rosie Holiwell, PA-CBakersfield, CA 933091548262975
Common questions
What is Barry Jon Massirio, PA-C's NPI number?
Barry Jon Massirio, PA-C's National Provider Identifier (NPI) is 1922000355, issued on Aug 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Barry Jon Massirio, PA-C located?
The NPPES record lists a practice address at 4580 California Ave, Bakersfield, CA, 93309. Phone: (661) 327-4411. Providers update this record themselves, so call before visiting.
How can I verify Barry Jon Massirio, PA-C's license?
NPPES lists California license number PA12341, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Barry Jon Massirio, PA-C prescribe under Medicare Part D?
In 2024, Barry Jon Massirio, PA-C had 36 Medicare Part D claims for 18 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.