Active NPI
Inja J Hwang, MD
- Family Medicine Physician
- Martinez, CA
National Provider Identifier
1821216581
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Family Medicine Physician
- License
- C43359
- Practice address
- 1000 Ward Street
Martinez, CA 94553 - Phone
- (925) 335-4707
- NPI assigned
- Apr 20, 2007
- Sex
- Female
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Family Medicine Physician | 207Q00000X | C43359 | CA | Primary |
| General Practice Physician | 208D00000X | C43359 | CA |
Addresses
Primary practice location
1000 Ward Street
Martinez, CA 94553
Mailing address
1871 Ventura Dr
Pittsburgh, CA 94565
Phone (925) 427-2494
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Not enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| C43359 | CA | MD | Family Medicine Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1177027200000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1821216581",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1871 VENTURA DR",
"city": "PITTSBURGH",
"state": "CA",
"postal_code": "94565",
"telephone_number": "925-427-2494"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1000 WARD STREET",
"city": "MARTINEZ",
"state": "CA",
"postal_code": "94553",
"telephone_number": "925-335-4707"
}
],
"practiceLocations": [],
"basic": {
"last_name": "HWANG",
"first_name": "INJA",
"middle_name": "J",
"name_prefix": "Dr.",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2007-04-20",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "207Q00000X",
"taxonomy_group": "",
"desc": "Family Medicine",
"state": "CA",
"license": "C43359",
"primary": true
},
{
"code": "208D00000X",
"taxonomy_group": "",
"desc": "General Practice",
"state": "CA",
"license": "C43359",
"primary": false
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Martinez, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.