Roberta Jean Dunn-Dixon, M.D.
Emergency Medicine Physician · Riverside, CA
Roberta Jean Dunn-Dixon, M.D. is an emergency medicine physician with a practice address in Riverside, California, and NPI 1548448970, issued on Feb 7, 2008. Check the license (California A99540, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Roberta Jean Dunn-Dixon
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A99540 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4443 Magnolia Ave, Riverside, CA 92501
- Phone
- (951) 788-3200
- Enumerated
- Feb 7, 2008
- Record last updated
- May 1, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080618000566); accepts Medicare assignment
- Medical or professional school
- Texas A & M University System, Hsc, College Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Verify Roberta Jean Dunn-Dixon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A99540Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average emergency medicine physician in 2024
79 Medicare Part D claims for 54 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin16 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
- EM Alliance California ApcWildomar, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Roberta Jean Dunn-Dixon among 7,751 emergency medicine physician records in California
Roberta Jean Dunn-Dixon, 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 2008, is newer than 50% of them.
- NPI issued2008 · 50% of these records are older, 46% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2005 · median 2011 among the 4,560 with a school on file
- Record last updated2015 · 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
- Richard Guth, M.DRiverside, CA 925011154437325
- Michael Kang, M.D.Riverside, CA 925011124294517
- James Kim, M.DRiverside, CA 925011861508038
- Edward Magee, MD, MPHRiverside, CA 925011851698880
Common questions
What is Roberta Jean Dunn-Dixon, M.D.'s NPI number?
Roberta Jean Dunn-Dixon, M.D.'s National Provider Identifier (NPI) is 1548448970, issued on Feb 7, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Roberta Jean Dunn-Dixon, M.D. located?
The NPPES record lists a practice address at 4443 Magnolia Ave, Riverside, CA, 92501. Phone: (951) 788-3200. Providers update this record themselves, so call before visiting.
How can I verify Roberta Jean Dunn-Dixon, M.D.'s license?
NPPES lists California license number A99540, 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 Roberta Jean Dunn-Dixon, M.D. prescribe under Medicare Part D?
In 2024, Roberta Jean Dunn-Dixon, M.D. had 79 Medicare Part D claims for 54 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.