Peter M. Mazzarese, P.A.
Physician Assistant · San Diego, CA
Peter M. Mazzarese, P.A. is a physician assistant with a practice address in San Diego, California, and NPI 1124099387, issued on Jan 27, 2006. Check the license (California PA16565, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Peter M. Mazzarese
- Credential
- P.A.
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA16565 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5555 Reservoir Dr Ste 203, San Diego, CA 92120
- Phone
- (619) 229-3340
- Enumerated
- Jan 27, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (619) 229-3341
- Medicaid ID
- PA16565 CA
- Medicare enrollment
- Enrolled (PECOS I20090630000635); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 5555 Reservoir Dr Ste 203
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Santomauro, M.DUrology Physician1073675591
Verify Peter M. Mazzarese in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA16565Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average physician assistant in 2024
62 Medicare Part D claims for 36 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Gabapentin15 claims
- Oxycodone Hcl12 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupSan Marcos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter M. Mazzarese among 14,451 physician assistant records in California
Peter M. Mazzarese, 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 2006, is newer than 1% of them.
- NPI issued2006 · 1% of these records are older, 87% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2002 · 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).
747 physician assistant records list a practice address in San Diego
They are 747 of the 52,937 NPPES records with a practice address in San Diego, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in San Diego → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Catherine Anderson, NPSan Diego, CA 921201811045750
- Sophea Bergen, PA-CSan Diego, CA 921201558300665
- John Frost, PASan Diego, CA 921201518015460
- Christopher Gallo, PASan Diego, CA 921201669520581
- Francisco Garcia, PASan Diego, CA 921201649328584
- John Hollingsworth, PACSan Diego, CA 921201548367527
- Joanne Manalo, PA-CSan Diego, CA 921201003986134
- Jeanne Olson, PASan Diego, CA 921201902954845
Common questions
What is Peter M. Mazzarese, P.A.'s NPI number?
Peter M. Mazzarese, P.A.'s National Provider Identifier (NPI) is 1124099387, issued on Jan 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter M. Mazzarese, P.A. located?
The NPPES record lists a practice address at 5555 Reservoir Dr Ste 203, San Diego, CA, 92120. Phone: (619) 229-3340. Providers update this record themselves, so call before visiting.
How can I verify Peter M. Mazzarese, P.A.'s license?
NPPES lists California license number PA16565, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Peter M. Mazzarese, P.A. prescribe under Medicare Part D?
In 2024, Peter M. Mazzarese, P.A. had 62 Medicare Part D claims for 36 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.