Marcus Eugene Harris, P.A-C
Physician Assistant · Ontario, CA
Marcus Eugene Harris, P.A-C is a physician assistant with a practice address in Ontario, California, and NPI 1134144876, issued on Jul 13, 2006. Check the license (California PA15601, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Marcus Eugene Harris
- Credential
- P.A-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA15601 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2295 S Vineyard Ave, Ontario, CA 91761
- Phone
- (883) 574-2273
- Enumerated
- Jul 13, 2006
- Record last updated
- Mar 6, 2023
- Medicare enrollment
- Enrolled (PECOS I20080523000303); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 2295 S Vineyard Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Leonila Araneta, LCSWClinical Social Worker1861771974
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Verify Marcus Eugene Harris in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA15601Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average physician assistant in 2024
181 Medicare Part D claims for 104 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 19 claims were for opioids.
Most prescribed
- Cephalexin16 claims
- Hydrocodone-Acetaminophen14 claims
- Azithromycin11 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
- Ignite Emergency Physicians A Medical CorporationChino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marcus Eugene Harris among 14,451 physician assistant records in California
Marcus Eugene Harris, P.A-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 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
- Graduated2000 · median 2018 among the 7,214 with a school on file
- Record last updated2023 · 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).
37 physician assistant records list a practice address in Ontario
They are 37 of the 5,375 NPPES records with a practice address in Ontario, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Ontario → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Kevin BellOntario, CA 917611497159818
- Lauren BoldaOntario, CA 917611497286082
- Charmaine Collins-Cepeda, PA-COntario, CA 917611801054820
- Carly Erard, PAOntario, CA 917611205087699
- Sepideh Homayoni, PA-COntario, CA 917611003357955
- Carol Kwak, PA-COntario, CA 917611891303293
- Robert PedrozaOntario, CA 917611821832551
- Nicholas Pena, PA-COntario, CA 917611083176077
Common questions
What is Marcus Eugene Harris, P.A-C's NPI number?
Marcus Eugene Harris, P.A-C's National Provider Identifier (NPI) is 1134144876, issued on Jul 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marcus Eugene Harris, P.A-C located?
The NPPES record lists a practice address at 2295 S Vineyard Ave, Ontario, CA, 91761. Phone: (883) 574-2273. Providers update this record themselves, so call before visiting.
How can I verify Marcus Eugene Harris, P.A-C's license?
NPPES lists California license number PA15601, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Marcus Eugene Harris, P.A-C prescribe under Medicare Part D?
In 2024, Marcus Eugene Harris, P.A-C had 181 Medicare Part D claims for 104 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.