Active NPI
John S Winfield, M.D.
- Cytopathology Physician
- Chico, CA
National Provider Identifier
1184674681
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Cytopathology Physician
- License
- C29483
- Practice address
- 183 E 8TH Ave
Chico, CA 95926-2341 - Phone
- (530) 891-6244
- Fax
- (530) 891-0134
- NPI assigned
- May 12, 2006
- Last updated
- Sep 11, 2025
- 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 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Anatomic Pathology & Clinical Pathology Physician | 207ZP0102X | C29483 | CA | |
| Cytopathology Physician | 207ZC0500X | C29483 | CA | Primary |
Addresses
Primary practice location
183 E 8TH Ave
Chico, CA 95926-2341
Mailing address
183 E 8TH Ave
Chico, CA 95926-2341
Phone (530) 891-6244
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 00C294830 | Medicaid | CA |
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 |
|---|---|---|---|
| C29483 | CA | MD | Anatomic Pathology & Clinical Pathology Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1147392000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1184674681",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "183 E 8TH AVE",
"city": "CHICO",
"state": "CA",
"postal_code": "959262341",
"telephone_number": "530-891-6244",
"fax_number": "530-891-0134"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "183 E 8TH AVE",
"city": "CHICO",
"state": "CA",
"postal_code": "959262341",
"telephone_number": "530-891-6244",
"fax_number": "530-891-0134"
}
],
"practiceLocations": [],
"basic": {
"last_name": "WINFIELD",
"first_name": "JOHN",
"middle_name": "S",
"credential": "M.D.",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2006-05-12",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "207ZP0102X",
"taxonomy_group": "",
"desc": "Pathology, Anatomic Pathology & Clinical Pathology",
"state": "CA",
"license": "C29483",
"primary": false
},
{
"code": "207ZC0500X",
"taxonomy_group": "",
"desc": "Pathology, Cytopathology",
"state": "CA",
"license": "C29483",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "00C294830",
"state": "CA"
}
],
"endpoints": [],
"other_names": []
}Other providers in Chico, CA
- W Ron Wilson, DDS
- Veronica Kathryn Wilt, LMFT #156400
- Windsor Chico Care Center, LLC (Windsor Chico Care Center)
- Windsor Chico Creek Care and Rehabilitation, LLC (Windsor Chico Creek and Rehabilitation Center)
- Micki Jean Winebarger
- Lisa Mari Winslow, L.C.S.W.
- Ann Winters
- Rebecca Walsh Winton, PSY.D.
- Cheryl Wipf, COTA
- Joanna Leslie Wirtz Miller
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.