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Edit this profileWhere to find Marcus E. Harris, P.A-C
- Ontario location main office
2295 S Vineyard Ave, Ontario, CA 91761 - Fontana location
9961 Sierra Ave, Fontana, CA 92335
About Marcus Harris
Marcus E. Harris, P.A-C is a physician assistant based in Ontario, CA. According to Medicare claims data, Marcus cared for 205 Medicare patients across 212 services. The services billed most often include emergency department visit with high level of medical decision making, emergency department visit with moderate level of medical decision making, and emergency department visit with low level of medical decision making. The provider's National Provider Identifier (NPI) is 1134144876.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (883) 574-2273
- Email not available
Practice Locations
2295 S VINEYARD AVE
Ontario, CA 91761
9961 Sierra Ave
Fontana, CA 92335
Procedures Most Often Billed to Medicare
212 services · 205 patients · 3 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
157 | More than most peers in Physician Assistant |
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
44 | As often as other peers in Physician Assistant |
| Emergency department visit with low level of medical decision making | Office visit | 99283 |
11 | Less often than most peers in Physician Assistant |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other physician assistants at this location 3
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 5
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 22 related providers in 3 groups
Other physician assistants in Ontario 7
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2000 at Other 7
Providers who graduated from the same medical school in the same year.
Common questions
What is Marcus E. Harris's specialty?
Marcus E. Harris is a physician assistant in Ontario, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Marcus E. Harris?
Marcus E. Harris is listed at 2295 S Vineyard Ave, Ontario, CA 91761. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Marcus E. Harris?
The number on file is (883) 574-2273. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Marcus E. Harris's NPI number?
Marcus E. Harris's National Provider Identifier is 1134144876. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Marcus E. Harris's education?
Marcus E. Harris attended Other, graduating in 2000. This comes from the CMS National Downloadable File.
CMS public data
How long has Marcus E. Harris been practicing?
Marcus E. Harris has 26 years experience. Calculated from a graduation year of 2000, reported in the CMS National Downloadable File.
CMS public data
What is Marcus E. Harris known for?
According to Medicare billing data, Marcus E. Harris the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Marcus E. Harris confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Marcus E. Harris. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.