Active NPI
Nathan Louis Maassel, MD
- Pediatric Surgery Physician
- Travis Afb, CA
National Provider Identifier
1265960348
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Pediatric Surgery Physician
- License
- 99543
- Practice address
- 101 Bodin Cir
Travis Afb, CA 94535-1809 - Phone
- (707) 423-3000
- NPI assigned
- Jun 1, 2017
- 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 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Surgery Physician | 208600000X | 99543 | GA | |
| Pediatric Surgery Physician | 2086S0120X | 99543 | GA | Primary |
Addresses
Primary practice location
101 Bodin Cir
Travis Afb, CA 94535-1809
Mailing address
101 Bodin Cir
Travis Afb, CA 94535-1809
Other practice location 1
2315 Stockton Blvd
Sacramento, CA 95817-2201
Phone (916) 734-2011
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Not listed in the public Medicare enrollment file
- Eligible to order & refer
- Part B services: No
- Medical equipment: Yes
- Home health: No
- Power mobility devices: Yes
- Hospice: No
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 72571 | CT | MD | Surgery Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1496275200000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1786406400000",
"number": "1265960348",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "101 BODIN CIR",
"city": "TRAVIS AFB",
"state": "CA",
"postal_code": "945351809"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "101 BODIN CIR",
"city": "TRAVIS AFB",
"state": "CA",
"postal_code": "945351809",
"telephone_number": "707-423-3000"
}
],
"practiceLocations": [
{
"address_1": "2315 Stockton Blvd",
"address_purpose": "LOCATION",
"city": "Sacramento",
"state": "CA",
"postal_code": "958172201",
"country_code": "US",
"telephone_number": "916-734-2011",
"country_name": "United States",
"address_type": "DOM"
}
],
"basic": {
"last_name": "MAASSEL",
"first_name": "NATHAN",
"middle_name": "LOUIS",
"credential": "MD",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2017-06-01",
"last_updated": "2026-08-11",
"certification_date": "2026-08-11",
"status": "A"
},
"taxonomies": [
{
"code": "208600000X",
"taxonomy_group": "",
"desc": "Surgery",
"state": "GA",
"license": "99543",
"primary": false
},
{
"code": "2086S0120X",
"taxonomy_group": "",
"desc": "Surgery, Pediatric Surgery",
"state": "GA",
"license": "99543",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}
Other providers in Travis Afb, CA
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 11, 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.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.