Stephen Christopher Patterson, M.D.
Emergency Medicine Physician · Riverside, CA
Stephen Christopher Patterson, M.D. is an emergency medicine physician with a practice address in Riverside, California, and NPI 1932124351, issued on Jul 13, 2006. Check the license (California A75189, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen Christopher Patterson
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A75189 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4445 Magnolia Ave, Riverside, CA 92501
- Phone
- (951) 788-3200
- Enumerated
- Jul 13, 2006
- Record last updated
- Dec 30, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 00A751890 CA
- Medicare enrollment
- Enrolled (PECOS I20080509000665); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 4445 Magnolia Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ahmed Abdelhalim, MDDiagnostic Radiology Physician1275162927
- Nirusha AbeydeeraStudent in an Organized Health Care Education/Training Program1295354454
- Alyssa Aboff, CRNA, DNPCertified Registered Nurse Anesthetist1760133292
- Brandon Abrajan, DOStudent in an Organized Health Care Education/Training Program1861141186
Verify Stephen Christopher Patterson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A75189Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average emergency medicine physician in 2024
54 Medicare Part D claims for 42 beneficiaries, against an average of 226 among the 54,106 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 94.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Cep America - CaliforniaMoreno Valley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Christopher Patterson among 7,751 emergency medicine physician records in California
Stephen Christopher Patterson, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1999 · median 2011 among the 4,560 with a school on file
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Riverside → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Jason An, M.D.Riverside, CA 925011851533905
- Ryan Brenchley, M.D.Riverside, CA 925011154437390
- Eugene Chan, M.D.Riverside, CA 925011952414674
- Kenneth Dale, D.ORiverside, CA 925011932158771
- Roberta Dunn-Dixon, M.D.Riverside, CA 925011548448970
- Richard Guth, M.DRiverside, CA 925011154437325
- Michael Kang, M.D.Riverside, CA 925011124294517
- James Kim, M.DRiverside, CA 925011861508038
Common questions
What is Stephen Christopher Patterson, M.D.'s NPI number?
Stephen Christopher Patterson, M.D.'s National Provider Identifier (NPI) is 1932124351, issued on Jul 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Christopher Patterson, M.D. located?
The NPPES record lists a practice address at 4445 Magnolia Ave, Riverside, CA, 92501. Phone: (951) 788-3200. Providers update this record themselves, so call before visiting.
How can I verify Stephen Christopher Patterson, M.D.'s license?
NPPES lists California license number A75189, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen Christopher Patterson, M.D. prescribe under Medicare Part D?
In 2024, Stephen Christopher Patterson, M.D. had 54 Medicare Part D claims for 42 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Stephen Christopher Patterson, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.