Mark David Horowitz, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

1613581 Issued in NY

Practice address

21 East 90TH St
New York, NY 10128

Phone

(212) 860-3077

Fax

(212) 410-7410

NPI assigned

Nov 7, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

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

Green means eligible to order or refer.

Enrollment records 1

Specialty

Internal MedicineAlso: Rheumatology

Education

Northeastern Ohio University College of Medicine, 1983

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Practice addresses (Care Compare)

Hospital & facility affiliations

• VNS of Ny Home Care Chha Home health agency, New York, NY, CCN 337008
• Mount Sinai Hospital Hospital, New York, NY, CCN 330024

Merit-based Incentive Payment System (MIPS)

Final score

19.77 of 100Reported as individual

Quality

0

Improvement activities

0

Cost

65.88

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

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.

• Mark D. Horowitz MD PC

  • Rheumatology Physician
  • New York, NY
  • NPI 1780988717
  Medicare reassignment NPD Authorized official

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Mount Sinai Hospital

  • Clinical Medical Laboratory
  • New York, NY
  • NPI 1033206362

  Hospital

  Care Compare affiliation
• Mount Sinai Hospital

  • General Acute Care Hospital
  • Long Island City, NY
  • NPI 1245248939
  Care Compare affiliation
• Mount Sinai Hospital

  • Rehabilitation Hospital
  • New York, NY
  • NPI 1669440327
  Care Compare affiliation
• Mount Sinai Hospital

  • General Acute Care Hospital
  • New York, NY
  • NPI 1932103413
  Care Compare affiliation
• Mount Sinai Hospital Pharmacy

  • General Acute Care Hospital
  • New York, NY
  • NPI 1225295512
  Care Compare affiliation
• Mount Sinai Hospital-Ambulance

  • Ambulance
  • New York, NY
  • NPI 1568601342

  Hospital

  Care Compare affiliation
• Visiting Nurse Service of New York Home Care II

  • Home Health Agency
  • New York, NY
  • NPI 1528059805
  Care Compare affiliation

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

{
    "created_epoch": "1162857600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757548800000",
    "number": "1154490530",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "21 EAST 90TH ST",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "10128",
            "telephone_number": "212-860-3077",
            "fax_number": "212-410-7410"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "21 EAST 90TH ST",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "10128",
            "telephone_number": "212-860-3077",
            "fax_number": "212-410-7410"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HOROWITZ",
        "first_name": "MARK",
        "middle_name": "DAVID",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-11-07",
        "last_updated": "2025-09-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NY",
            "license": "1613581",
            "primary": true
        },
        {
            "code": "207RR0500X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Rheumatology",
            "state": "NY",
            "license": "1613581",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Julian B. Horowitz, PH.D.
• Julie Horowitz, M.S
• Kelly Shea McMeen Horowitz, PSY. D.
• Kelsey Rae Horowitz
• Lauren Horowitz, OTR/L
• Marylin Horowitz, LP
• Matthew C Horowitz, O.D
• Maya Horowitz, LMSW
• Melissa Dillon Horowitz, PSYD
• Michael Jay Horowitz, DC

• Internal Medicine Physician in New York, NY
• Providers in New York, NY by specialty
• Internal Medicine Physician in New York

• 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.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.