James D. Mosson, M.D.
Internal Medicine Physician · Sonora, CA
James D. Mosson, M.D. is an internal medicine physician with a practice address in Sonora, California, and NPI 1437135670, issued on Dec 20, 2005. Check the license (California G25381, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James D. Mosson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G25381 CA
Self-reported in NPPES; status is on the state search - Practice location
- 900 Greenley RD, Sonora, CA 95370
- Phone
- (209) 536-3738
- Enumerated
- Dec 20, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (209) 536-3565
- Medicare enrollment
- Enrolled (PECOS I20060406000592); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 1972
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 900 Greenley RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Shalom Margolis, M.D.Specialist1215976576
Verify James D. Mosson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G25381Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% more Medicare Part D claims than the average internal medicine physician in 2024
5,003 Medicare Part D claims for 344 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. 376 claims were for opioids.
Most prescribed
- Atorvastatin Calcium231 claims
- Hydrocodone-Acetaminophen224 claims
- Amlodipine Besylate204 claims
- Losartan Potassium198 claims
- Metoprolol Succinate173 claims
- Levothyroxine Sodium147 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
- Mark Twain Health Care DistrictValley Springs, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James D. Mosson among 17,696 internal medicine physician records in California
James D. Mosson, M.D. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1972 · median 2004 among the 11,065 with a school on file
- Record last updated2026 · 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).
17 internal medicine physician records list a practice address in Sonora
They are 17 of the 629 NPPES records with a practice address in Sonora, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sonora → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Allen, M.D.Sonora, CA 953701184687535
- Leslie Brocchini, MDSonora, CA 953701811966047
- Brenda Forrest, M.DSonora, CA 953701538375365
- Jason Jeffery, M.D.Sonora, CA 953701427293836
- Daniel Meador, MDSonora, CA 953701619925989
- Daniel Phillips, M.D.Sonora, CA 953701720042732
- Maureen Regan, MDSonora, CA 953701477532273
- Reiker Schultz, MDSonora, CA 953701285910554
Common questions
What is James D. Mosson, M.D.'s NPI number?
James D. Mosson, M.D.'s National Provider Identifier (NPI) is 1437135670, issued on Dec 20, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James D. Mosson, M.D. located?
The NPPES record lists a practice address at 900 Greenley RD, Sonora, CA, 95370. Phone: (209) 536-3738. Providers update this record themselves, so call before visiting.
How can I verify James D. Mosson, M.D.'s license?
NPPES lists California license number G25381, 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 D. Mosson, M.D. prescribe under Medicare Part D?
In 2024, James D. Mosson, M.D. had 5,003 Medicare Part D claims for 344 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.