Ellen Cayman Pacson, M.D.
Family Medicine Physician · Riverside, CA
Ellen Cayman Pacson, M.D. is a family medicine physician with a practice address in Riverside, California, and NPI 1184940678, issued on Apr 9, 2010. Check the license (California A123136, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ellen Cayman Pacson
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A123136 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10800 Magnolia Avebue, Riverside, CA 92505
- Phone
- (951) 353-4619
- Enumerated
- Apr 9, 2010
- Record last updated
- Dec 10, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (951) 353-5838
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Verify Ellen Cayman Pacson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A123136Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% more Medicare Part D claims than the average family medicine physician in 2024
6,719 Medicare Part D claims for 696 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 307 claims were for opioids.
Most prescribed
- Atorvastatin Calcium577 claims
- Amlodipine Besylate270 claims
- Lisinopril250 claims
- Losartan Potassium238 claims
- Levothyroxine Sodium232 claims
- Hydrocodone-Acetaminophen164 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.
Ellen Cayman Pacson among 17,133 family medicine physician records in California
Ellen Cayman Pacson, M.D. is one of 17,133 family 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 2010, is newer than 60% of them.
- NPI issued2010 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
258 family medicine physician records list a practice address in Riverside
They are 258 of the 13,893 NPPES records with a practice address in Riverside, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Riverside → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Francis Chu, MDRiverside, CA 925051225105166
- Vanessa Ho, MDRiverside, CA 925051679512776
- Judith Holmes, MDRiverside, CA 925051740357615
- Paul Hsiang, MDRiverside, CA 925051841367679
- Emanuel Kristianto, MDRiverside, CA 925051063589075
- Richard Liu, MDRiverside, CA 925051396812277
- Michele Martinez, MD.Riverside, CA 925051205939204
- Karen McBride, MDRiverside, CA 925051841378395
Common questions
What is Ellen Cayman Pacson, M.D.'s NPI number?
Ellen Cayman Pacson, M.D.'s National Provider Identifier (NPI) is 1184940678, issued on Apr 9, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Ellen Cayman Pacson, M.D. located?
The NPPES record lists a practice address at 10800 Magnolia Avebue, Riverside, CA, 92505. Phone: (951) 353-4619. Providers update this record themselves, so call before visiting.
How can I verify Ellen Cayman Pacson, M.D.'s license?
NPPES lists California license number A123136, 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 Ellen Cayman Pacson, M.D. prescribe under Medicare Part D?
In 2024, Ellen Cayman Pacson, M.D. had 6,719 Medicare Part D claims for 696 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.