James Larsen, M.D.
Geriatric Medicine (Internal Medicine) Physician · Loma Linda, CA
James Larsen, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Loma Linda, California, and NPI 1760403547, issued on Jul 21, 2006. Check the license (California G50426, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Larsen
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- G50426 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11370 Anderson St, Loma Linda, CA 92354
- Phone
- (909) 558-2191
- Enumerated
- Jul 21, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00G504260 CA
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 11370 Anderson St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ahmed Abou-Zamzam, M.D.Vascular Surgery Physician1558306795
- Borhaan Ahmad, M.D.Pediatrics Physician1740203595
Verify James Larsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G50426Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
4,017 Medicare Part D claims for 476 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 34 claims were for opioids.
Most prescribed
- Atorvastatin Calcium316 claims
- Amlodipine Besylate224 claims
- Losartan Potassium172 claims
- Omeprazole156 claims
- Levothyroxine Sodium135 claims
- Lisinopril129 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 85.2 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).
James Larsen among 532 geriatric medicine (internal medicine) physician records in California
James Larsen, M.D. is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 46% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 51% of these records are
- Record last updated2007 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
All 532 in California → Every provider in Loma Linda → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Katalin Danji, M.D.Loma Linda, CA 923541750504080
- Cesar Libanati, M.D.Loma Linda, CA 923541962563338
- Vishvanath Date, M.D.Loma Linda, CA 923571851482541
- Margaret Griffin, M.D.Loma Linda, CA 923571447260047
- Russell Hoxie, M.D.Loma Linda, CA 923571841290558
- Malwinder Multani, M.D.Loma Linda, CA 923571497919575
- Kumari Jayawardena, MDFontana, CA 923351255388385
- Victoria Rains, M.D.Redlands, CA 923731861503278
Common questions
What is James Larsen, M.D.'s NPI number?
James Larsen, M.D.'s National Provider Identifier (NPI) is 1760403547, issued on Jul 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James Larsen, M.D. located?
The NPPES record lists a practice address at 11370 Anderson St, Loma Linda, CA, 92354. Phone: (909) 558-2191. Providers update this record themselves, so call before visiting.
How can I verify James Larsen, M.D.'s license?
NPPES lists California license number G50426, 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 Larsen, M.D. prescribe under Medicare Part D?
In 2024, James Larsen, M.D. had 4,017 Medicare Part D claims for 476 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
What is James Larsen, M.D.'s MIPS final score?
The 2023 MIPS final score is 85.2 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.