Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

2 5th Avenue Medical

Q: What is the NPI number for 2 5th Avenue Medical?

The NPI for 2 5th Avenue Medical is 1013839174, a Type 2 (organization) record in the CMS NPPES registry.

Rheumatology Physician in New York, NY · enumerated 2026 · authorized official Jason Siefferman, Partber.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1013839174

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name 2 5th Avenue Medical

Practice address 2 5th Ave Ste 9, New York, NY, 10011

Phone (646) 580-3538

Fax (844) 841-8382

Enumeration date Jul 29, 2026

Last updated in NPPES Aug 3, 2026

Taxonomy & classification

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Jason Siefferman

Title Partber

Phone (646) 580-3538

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for 2 5th Avenue Medical?

The NPI for 2 5th Avenue Medical is 1013839174, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for 2 5th Avenue Medical?

NPPES lists Jason Siefferman (Partber) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-08-03.