James Robert Brown, M.D.
Family Medicine Physician · Rancho Cucamonga, CA
James Robert Brown, M.D. is a family medicine physician with a practice address in Rancho Cucamonga, California, and NPI 1073597738, issued on Dec 5, 2005. Check the license (California A51937, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Robert Brown
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A51937 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8360 Red Oak St, Rancho Cucamonga, CA 91730
- Phone
- (909) 980-1946
- Enumerated
- Dec 5, 2005
- Record last updated
- Jun 2, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (909) 980-1625
- Medicare enrollment
- Enrolled (PECOS I20110516000668); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1990
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 8360 Red Oak St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Constance Haddad, FNPFamily Nurse Practitioner1811288665
Verify James Robert Brown in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A51937Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% fewer Medicare Part D claims than the average family medicine physician in 2024
3,262 Medicare Part D claims for 405 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 85 claims were for opioids.
Most prescribed
- Atorvastatin Calcium175 claims
- Amlodipine Besylate155 claims
- Levothyroxine Sodium143 claims
- Lisinopril131 claims
- Hydrochlorothiazide109 claims
- Metformin Hcl102 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.
James Robert Brown among 17,133 family medicine physician records in California
James Robert Brown, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 94% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1990 · median 2005 among the 10,652 with a school on file
- Record last updated2012 · 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).
62 family medicine physician records list a practice address in Rancho Cucamonga
They are 62 of the 4,579 NPPES records with a practice address in Rancho Cucamonga, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Rancho Cucamonga → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Marc Avent, DORancho Cucamonga, CA 917301437104783
- Eldine Banquerigo, M.D.Rancho Cucamonga, CA 917301851367528
- Steven Barag, D.O.Rancho Cucamonga, CA 917301366444838
- Juan Cortes, DORancho Cucamonga, CA 917301760432181
- Rommie Fakhoury, MDRancho Cucamonga, CA 917301528000643
- Sandra Force-Obrowski, M.D.Rancho Cucamonga, CA 917301023034873
- Patricia Guevara-Channell, MDRancho Cucomonga, CA 917301841266392
- Jin Kim, M.D.Rancho Cucamonga, CA 917301558371401
Common questions
What is James Robert Brown, M.D.'s NPI number?
James Robert Brown, M.D.'s National Provider Identifier (NPI) is 1073597738, issued on Dec 5, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James Robert Brown, M.D. located?
The NPPES record lists a practice address at 8360 Red Oak St, Rancho Cucamonga, CA, 91730. Phone: (909) 980-1946. Providers update this record themselves, so call before visiting.
How can I verify James Robert Brown, M.D.'s license?
NPPES lists California license number A51937, 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 James Robert Brown, M.D. prescribe under Medicare Part D?
In 2024, James Robert Brown, M.D. had 3,262 Medicare Part D claims for 405 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.