Alexander Van On, M.D.

Primary specialty

Ophthalmology PhysicianTaxonomy code 207W00000X

License

D0066271 Issued in MD

Practice address

2411 W Belvedere Avenue, 6TH Floor
Morton Mower, M.D., Mob
Baltimore, MD 21215

Phone

(410) 601-8283

Fax

(410) 601-8273

NPI assigned

Jun 14, 2006

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Interoperability endpoints

• Direct secure messaging: alexander.on@direct.vmmc.org

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.

• Sinai Hospital of Baltimore Inc

  • General Acute Care Hospital
  • Baltimore, MD
  • NPI 1437174059

  Ophthalmology

  NPD (past)

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

{
    "created_epoch": "1150243200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1225071624",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2401 W BELVEDERE AVE",
            "address_2": "ATTN: CREDENTIALING",
            "city": "BALTIMORE",
            "state": "MD",
            "postal_code": "212155216",
            "telephone_number": "410-601-5524",
            "fax_number": "410-601-8946"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2411 W BELVEDERE AVENUE, 6TH FLOOR",
            "address_2": "MORTON MOWER, M.D., MOB",
            "city": "BALTIMORE",
            "state": "MD",
            "postal_code": "21215",
            "telephone_number": "410-601-8283",
            "fax_number": "410-601-8273"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ON",
        "first_name": "ALEXANDER",
        "middle_name": "VAN",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-14",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207W00000X",
            "taxonomy_group": "",
            "desc": "Ophthalmology",
            "state": "MD",
            "license": "D0066271",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Ophthalmology Physician in Baltimore, MD
• Providers in Baltimore, MD by specialty
• Ophthalmology Physician in Maryland

• 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.