Active NPI
Serafin Castillo Ilagan, M.D.
- Surgery Physician
- Oak Brook, IL
National Provider Identifier
1043504343
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Surgery Physician
- License
- 036041529
- Practice address
- 40 N Tower Rd
Oak Brook, IL 60523-1155 - Phone
- (702) 242-8477
- NPI assigned
- Jun 3, 2011
- Last updated
- Sep 6, 2026
- Sex
- Male
- Sole proprietor
- Yes
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 |
|---|---|---|---|---|
| Surgery Physician | 208600000X | 036041529 | IL | Primary |
Addresses
Primary practice location
40 N Tower Rd
Oak Brook, IL 60523-1155
Mailing address
40 N Tower Rd
Oak Brook, IL 60523-1155
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 036041529 | Other | IL | LICENSE |
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 |
|---|---|---|---|
| 036041529 | IL | MD | Surgery Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1307059200000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1788652800000",
"number": "1043504343",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "40 N TOWER RD",
"city": "OAK BROOK",
"state": "IL",
"postal_code": "605231155"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "40 N TOWER RD",
"city": "OAK BROOK",
"state": "IL",
"postal_code": "605231155",
"telephone_number": "702-242-8477"
}
],
"practiceLocations": [],
"basic": {
"last_name": "ILAGAN",
"first_name": "SERAFIN",
"middle_name": "CASTILLO",
"name_prefix": "Dr.",
"credential": "M.D.",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2011-06-03",
"last_updated": "2026-09-06",
"status": "A"
},
"taxonomies": [
{
"code": "208600000X",
"taxonomy_group": "",
"desc": "Surgery",
"state": "IL",
"license": "036041529",
"primary": true
}
],
"identifiers": [
{
"code": "01",
"desc": "Other (non-Medicare)",
"issuer": "LICENSE",
"identifier": "036041529",
"state": "IL"
}
],
"endpoints": [],
"other_names": []
}Other providers in Oak Brook, IL
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 6, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.