Dorothy J Zajac, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

Practice address

1315 Lehmen Dr
Chester, IL 62233-2542

Phone

(618) 826-4571

Fax

(618) 826-3229

NPI assigned

Oct 19, 2005

Sex

Female

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 IL

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

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.

• Illinois Department of Human Services

  • Intellectual Disabilities Intermediate Care Facility
  • Centralia, IL
  • NPI 1003960394
  Medicare reassignment NPD
• Illinois Department of Human Services

  • Psychiatric Hospital
  • Chester, IL
  • NPI 1306834726
  NPD
• Illinois Department of Human Services

  • Psychiatric Hospital
  • Hines, IL
  • NPI 1902903487
  NPD

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

{
    "created_epoch": "1129680000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1972592210",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 306",
            "address_2": "120 N CROSBY AVE",
            "city": "JANESVILLE",
            "state": "WI",
            "postal_code": "535470306",
            "telephone_number": "608-754-6017"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1315 LEHMEN DR",
            "city": "CHESTER",
            "state": "IL",
            "postal_code": "622332542",
            "telephone_number": "618-826-4571",
            "fax_number": "618-826-3229"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ZAJAC",
        "first_name": "DOROTHY",
        "middle_name": "J",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2005-10-19",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "WI",
            "license": "22841",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Nageswararao Vallabhaneni, MD PSYCHIATRIST
• Walmart Inc.
• Kathleen Ann Winkler, RPH
• Andrea Winterberg, RPH
• Doyle Thomas Witt, M.D.

• Internal Medicine Physician in Chester, IL
• Providers in Chester, IL by specialty
• Internal Medicine Physician in Illinois

• 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.
• 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.