Leonard A Haas, MD

Primary specialty

Pediatric Gastroenterology PhysicianTaxonomy code 2080P0206X

License

330110 Issued in NY

Practice address

2800 Marcus Ave Ste 201
New Hyde Park, NY 11042-1113

Phone

(516) 622-6076

Fax

(470) 275-0726

NPI assigned

Apr 3, 2018

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: lhaas116560@direct.optum.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.

• Optum Medical Care, P.C.

  • Cardiovascular Disease Physician
  • Mount Kisco, NY
  • NPI 1982643003

  NY

  Medicare reassignment NPD
• Optum Medical Care, P.C.

  • Durable Medical Equipment & Medical Supplies
  • New Hyde Park, NY
  • NPI 1053190595
  NPD
• Mount Kisco Medical Group

  • Hematology (Internal Medicine) Physician
  • Fishkill, NY
  • NPI 1952356362
  NPD (past)

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

{
    "created_epoch": "1522713600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1772323200000",
    "number": "1073019584",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2800 MARCUS AVE STE 201",
            "city": "NEW HYDE PARK",
            "state": "NY",
            "postal_code": "110421113",
            "telephone_number": "516-622-6076",
            "fax_number": "516-622-6075"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2800 MARCUS AVE STE 201",
            "city": "NEW HYDE PARK",
            "state": "NY",
            "postal_code": "110421113",
            "telephone_number": "516-622-6076",
            "fax_number": "470-275-0726"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "165 N Village Ave Ste 215",
            "address_purpose": "LOCATION",
            "city": "Rockville Centre",
            "state": "NY",
            "postal_code": "115703701",
            "country_code": "US",
            "telephone_number": "516-622-6076",
            "fax_number": "516-622-6075",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HAAS",
        "first_name": "LEONARD",
        "middle_name": "A",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-04-03",
        "last_updated": "2026-03-01",
        "certification_date": "2026-03-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080P0206X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Gastroenterology",
            "state": "NY",
            "license": "330110",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Howard Guzik, MD
• Silvia Marcela Guzman Quintero, MD
• Larissa Phifer Guzzardi
• H. Shay Anesthesia PC
• Wendy Ha
• Dana Haddad, MD, PHD
• Ellen K Haddad, DO
• Carylann Hadjiyane, M.D.
• Sanam Hafeez
• Julia Haft

• Pediatric Gastroenterology Physician in New Hyde Park, NY
• Providers in New Hyde Park, NY by specialty
• Pediatric Gastroenterology Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 1, 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.

Verify at the official NPI Registry.