Active NPI
Sergio Gutierrez Nunez, MD
- Anesthesiology Physician
- Chicago, IL
National Provider Identifier
1003705724
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Anesthesiology Physician
- License
- 125.085328
- Practice address
- 836 W Wellington Ave
Chicago, IL 60657-5147 - Phone
- (773) 296-5187
- Fax
- (773) 296-8074
- NPI assigned
- Jun 30, 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 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Anesthesiology Physician | 207L00000X | 125.085328 | IL | Primary |
Addresses
Primary practice location
836 W Wellington Ave
Chicago, IL 60657-5147
Mailing address
455 W Wellington Ave Apt 267
Chicago, IL 60657-5836
Phone (385) 223-3342
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 |
|---|---|---|---|
| 125.085328 | IL | MD | Anesthesiology Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1751241600000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1751241600000",
"number": "1003705724",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "455 W WELLINGTON AVE APT 267",
"city": "CHICAGO",
"state": "IL",
"postal_code": "606575836",
"telephone_number": "385-223-3342"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "836 W WELLINGTON AVE",
"city": "CHICAGO",
"state": "IL",
"postal_code": "606575147",
"telephone_number": "773-296-5187",
"fax_number": "773-296-8074"
}
],
"practiceLocations": [],
"basic": {
"last_name": "GUTIERREZ NUNEZ",
"first_name": "SERGIO",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2025-06-30",
"last_updated": "2025-06-30",
"certification_date": "2025-06-29",
"status": "A"
},
"taxonomies": [
{
"code": "207L00000X",
"taxonomy_group": "",
"desc": "Anesthesiology",
"state": "IL",
"license": "125.085328",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Chicago, IL
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 30, 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.