Ronald G. Dulos, MD
Internal Medicine Physician · Riverside, CA
Ronald G. Dulos, MD is an internal medicine physician with a practice address in Riverside, California, and NPI 1821063710, issued on Feb 22, 2006. Check the license (California A87602, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ronald G. Dulos
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A87602 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6405 Day St, Riverside, CA 92507
- Phone
- (951) 697-5422
- Enumerated
- Feb 22, 2006
- Record last updated
- Apr 11, 2025
- Fax
- (951) 697-5587
- Medicare enrollment
- Enrolled (PECOS I20040810001066); accepts Medicare assignment
- Medical or professional school
- University Of Kansas School Of Med (Kc/Wich/Sal), 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 6405 Day St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ronald G. Dulos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A87602Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.6 times the Medicare Part D claims of the average internal medicine physician in 2024
14,511 Medicare Part D claims for 989 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 349 claims were for opioids.
Most prescribed
- Atorvastatin Calcium986 claims
- Amlodipine Besylate634 claims
- Losartan Potassium451 claims
- Metformin Hcl438 claims
- Levothyroxine Sodium425 claims
- Omeprazole367 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.
Industry payments in 2024: $119.98
5 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Riverside Medical Clinic IncRiverside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald G. Dulos among 17,696 internal medicine physician records in California
Ronald G. Dulos, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2001 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
187 internal medicine physician records list a practice address in Riverside
They are 187 of the 13,893 NPPES records with a practice address in Riverside, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Riverside → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Douglas Eaton, MDRiverside, CA 925071326023359
- Uju Ezeamama, MD, MSNRiverside, CA 925071316462724
- Kajal Gupta, M.DRiverside, CA 925071154461010
- Thuyvan Nguyen, D.O.Riverside, CA 925071275859233
- Daniel Pearce, D.O.Riverside, CA 925071376635383
- Nikita Shah, DORiverside, CA 925071407485402
- Margaret Song, MDRiverside, CA 925071104074814
- Christopher Swanson, M.D.Riverside, CA 925071023016847
Common questions
What is Ronald G. Dulos, MD's NPI number?
Ronald G. Dulos, MD's National Provider Identifier (NPI) is 1821063710, issued on Feb 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald G. Dulos, MD located?
The NPPES record lists a practice address at 6405 Day St, Riverside, CA, 92507. Phone: (951) 697-5422. Providers update this record themselves, so call before visiting.
How can I verify Ronald G. Dulos, MD's license?
NPPES lists California license number A87602, 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 Ronald G. Dulos, MD prescribe under Medicare Part D?
In 2024, Ronald G. Dulos, MD had 14,511 Medicare Part D claims for 989 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.