Active NPI
John G Larsen, MD
- Pediatric Infectious Diseases Physician
- New York City, NY
National Provider Identifier
1700974169
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Pediatric Infectious Diseases Physician
- License
- 129356
- Practice address
- 1245 Park Ave
C/O Uptown Pediatrics
New York City, NY 10128 - Phone
- (212) 427-0540
- Fax
- (212) 534-1086
- NPI assigned
- Oct 11, 2006
- 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 |
|---|---|---|---|---|
| Pediatrics Physician | 208000000X | 129356 | NY | |
| Pediatric Infectious Diseases Physician | 2080P0208X | 129356 | NY | Primary |
Addresses
Primary practice location
1245 Park Ave
C/O Uptown Pediatrics
New York City, NY 10128
Mailing address
1245 Park Ave
C/O Uptown Pediatrics
New York City, NY 10128
Phone (212) 427-0540
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 00686035 | Medicaid | NY |
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 |
|---|---|---|---|
| 129356 | NY | MD | Pediatric Infectious Diseases Physician |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Uptown Pediatrics | Pediatrics | Past | Accepting new patients |
| Mount Sinai Hospital | Past | Accepting new patients |
Networks
- Healthfirst Medicare Network H9678
Organizations & group practices 2
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- General Acute Care Hospital
- New York, NY
- NPI 1932103413
-
- Pediatrics Physician
- New York, NY
- NPI 1619016854
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1160524800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1757548800000",
"number": "1700974169",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "1245 PARK AVE",
"address_2": "C/O UPTOWN PEDIATRICS",
"city": "NEW YORK CITY",
"state": "NY",
"postal_code": "10128",
"telephone_number": "212-427-0540",
"fax_number": "212-534-1086"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "1245 PARK AVE",
"address_2": "C/O UPTOWN PEDIATRICS",
"city": "NEW YORK CITY",
"state": "NY",
"postal_code": "10128",
"telephone_number": "212-427-0540",
"fax_number": "212-534-1086"
}
],
"practiceLocations": [],
"basic": {
"last_name": "LARSEN",
"first_name": "JOHN",
"middle_name": "G",
"name_prefix": "Dr.",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2006-10-11",
"last_updated": "2025-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "208000000X",
"taxonomy_group": "",
"desc": "Pediatrics",
"state": "NY",
"license": "129356",
"primary": false
},
{
"code": "2080P0208X",
"taxonomy_group": "",
"desc": "Pediatrics, Pediatric Infectious Diseases",
"state": "NY",
"license": "129356",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "00686035",
"state": "NY"
}
],
"endpoints": [],
"other_names": []
}Other providers in New York City, NY
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.