2 5TH Avenue Medical

Primary specialty

Rheumatology PhysicianTaxonomy code 207RR0500X

Legal business name

2 5TH AVENUE MEDICAL

Practice address

2 5TH Ave Ste 9
New York, NY 10011-8855

Phone

(646) 580-3538

Fax

(844) 841-8382

NPI assigned

Jul 29, 2026

Organization subpart

No

Registry information is reported by the provider to CMS and is not verified. About this source

Authorized official

Name

Dr. Jason Siefferman, MD

Title

Partber

Phone

(646) 580-3538

Specialties & licenses 1

Addresses

Locations

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1785283200000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1785715200000",
    "number": "1013839174",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2 5TH AVE STE 9",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100118855",
            "telephone_number": "646-580-3538",
            "fax_number": "844-841-8382"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2 5TH AVE STE 9",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100118855",
            "telephone_number": "646-580-3538",
            "fax_number": "844-841-8382"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "2 5TH AVENUE MEDICAL",
        "organizational_subpart": "NO",
        "enumeration_date": "2026-07-29",
        "last_updated": "2026-08-03",
        "certification_date": "2026-08-03",
        "status": "A",
        "authorized_official_last_name": "SIEFFERMAN",
        "authorized_official_first_name": "JASON",
        "authorized_official_title_or_position": "PARTBER",
        "authorized_official_telephone_number": "646-580-3538",
        "authorized_official_name_prefix": "Dr.",
        "authorized_official_credential": "MD"
    },
    "taxonomies": [
        {
            "code": "207RR0500X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine, Rheumatology",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 3, 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.

Verify at the official NPI Registry.