Active NPI
James D. Mosson, M.D.
- Internal Medicine Physician
- Sonora, CA
National Provider Identifier
1437135670
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Internal Medicine Physician
- License
- G25381
- Practice address
- 900 Greenley Rd
Suite 922
Sonora, CA 95370-5287 - Phone
- (209) 536-3738
- Fax
- (209) 536-3565
- NPI assigned
- Dec 20, 2005
- Sex
- Male
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Internal Medicine Physician | 207R00000X | G25381 | CA | Primary |
Addresses
Primary practice location
900 Greenley Rd
Suite 922
Sonora, CA 95370-5287
Mailing address
900 Greenley Rd
Suite 922
Sonora, CA 95370-5287
Phone (209) 536-3738
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in CA
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 1
Care Compare profile
Medicare Care Compare- Specialty
- Internal Medicine
- Education
- University of California, Davis School of Medicine, 1972
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
Practice addresses (Care Compare)
51 Wellness Way
Valley Springs, CA 95252-9736
Phone (209) 772-7070
Hospital & facility affiliations
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 25381 | CA | MD | Clinical Social Worker |
| G25381 | CA | MD | Internal Medicine Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Mark Twain Health Care District | Current | Accepting new patients | |
| Mark Twain Medical Center | Past | Accepting new patients |
Locations
51 Wellness Way
Valley Springs, CA 95252
Phone (209) 772-7070
Interoperability endpoints
- james.mosson.1@19210.direct.athenahealth.com
Organizations & group practices 2
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Rural Health Clinic/Center
- Valley Springs, CA
- NPI 1306311329
-
- Critical Access Hospital
- San Andreas, CA
- NPI 1508968819
Hospital & facility affiliations 18
Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.
-
- Home Health Agency
- Salida, CA
- NPI 1972809838
-
- Home Health Agency
- Folsom, CA
- NPI 1902321383
-
- Critical Access Hospital
- San Andreas, CA
- NPI 1508968819
-
- General Acute Care Hospital
- Stockton, CA
- NPI 1528190931
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1135036800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1783900800000",
"number": "1437135670",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "900 GREENLEY RD",
"address_2": "SUITE 922",
"city": "SONORA",
"state": "CA",
"postal_code": "953705287",
"telephone_number": "209-536-3738",
"fax_number": "209-536-3565"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "900 GREENLEY RD",
"address_2": "SUITE 922",
"city": "SONORA",
"state": "CA",
"postal_code": "953705287",
"telephone_number": "209-536-3738",
"fax_number": "209-536-3565"
}
],
"practiceLocations": [],
"basic": {
"last_name": "MOSSON",
"first_name": "JAMES",
"middle_name": "D.",
"name_prefix": "Dr.",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2005-12-20",
"last_updated": "2026-07-13",
"status": "A"
},
"taxonomies": [
{
"code": "207R00000X",
"taxonomy_group": "",
"desc": "Internal Medicine",
"state": "CA",
"license": "G25381",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Sonora, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.