Margaret R. Hammerschlag, M.D.

Primary specialty

Pediatric Infectious Diseases PhysicianTaxonomy code 2080P0208X

License

141472-1 Issued in NY

Practice address

450 Clarkson Ave
B4-333
Brooklyn, NY 11203-2056

Phone

(718) 270-4714

Fax

(718) 270-1985

NPI assigned

Dec 7, 2005

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Networks

• Healthfirst Medicare Network H9678
• Healthfirst Medicare Network H5989
• Healthfirst Medicare Network H1722
• Healthfirst Medicare Network H3359

Interoperability endpoints

• Direct secure messaging: mhammerschlag1052905@nychhc.direct-ci.com

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.

• New York City Health and Hospitals Corporation

  • General Acute Care Hospital
  • Bronx, NY
  • NPI 1679587679
  NPD (past)
• Suny Downstate Medical Center

  • Emergency Medicine Physician
  • Brooklyn, NY
  • NPI 1699704155
  NPD (past)
• University Physicians of Brooklyn, Inc.

  • Pediatrics Physician
  • Brooklyn, NY
  • NPI 1649227190
  NPD (past)

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

{
    "created_epoch": "1133913600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1629053103",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "450 CLARKSON AVE",
            "address_2": "BOX 1262",
            "city": "BROOKLYN",
            "state": "NY",
            "postal_code": "112032056",
            "telephone_number": "718-270-8867",
            "fax_number": "718-270-1794"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "450 CLARKSON AVE",
            "address_2": "B4-333",
            "city": "BROOKLYN",
            "state": "NY",
            "postal_code": "112032056",
            "telephone_number": "718-270-4714",
            "fax_number": "718-270-1985"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HAMMERSCHLAG",
        "first_name": "MARGARET",
        "middle_name": "R.",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2005-12-07",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080P0208X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Infectious Diseases",
            "state": "NY",
            "license": "141472-1",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00695767",
            "state": "NY"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Katherine Hammer, CSW
• Natalie Hammer
• Sema Hammer
• Steven Hammer, OD
• Karen Laura Hammerman, MD
• Melanie Ann Hammett, REGISTERED NURSE
• Kate L. Hammon, LCSW
• Ebony Hammond
• Erna Jerryline Hammond, LMSW
• Kamryn Hammond

• Pediatric Infectious Diseases Physician in Brooklyn, NY
• Providers in Brooklyn, NY by specialty
• Pediatric Infectious Diseases Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.