Active NPI
Mark Ren, MD
- Orthopaedic Surgery Physician
- New York, NY
National Provider Identifier
1053881540
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Orthopaedic Surgery Physician
- License
- 341684
- Practice address
- 535 E 70TH St
New York, NY 10021-4823 - Phone
- (212) 606-1000
- NPI assigned
- Nov 28, 2018
- 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 |
|---|---|---|---|---|
| Orthopaedic Surgery Physician | 207X00000X | 341684 | NY | Primary |
Addresses
Primary practice location
535 E 70TH St
New York, NY 10021-4823
Mailing address
535 E 70TH St
New York, NY 10021-4898
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in NY
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 1
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20220316003139 | NY | Order and Referring Only - Orthopedic Surgery | 7719372457 |
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 341684 | NY | MD | Orthopaedic Surgery Physician |
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1543363200000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1770336000000",
"number": "1053881540",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "535 E 70TH ST",
"city": "NEW YORK",
"state": "NY",
"postal_code": "100214898"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "535 E 70TH ST",
"city": "NEW YORK",
"state": "NY",
"postal_code": "100214823",
"telephone_number": "212-606-1000"
}
],
"practiceLocations": [],
"basic": {
"last_name": "REN",
"first_name": "MARK",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "M",
"enumeration_date": "2018-11-28",
"last_updated": "2026-02-06",
"certification_date": "2026-02-06",
"status": "A"
},
"taxonomies": [
{
"code": "207X00000X",
"taxonomy_group": "",
"desc": "Orthopaedic Surgery",
"state": "NY",
"license": "341684",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in New York, NY
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 6, 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.