Nadeem Siddiqui, MD

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

036175750 Issued in IL

Practice address

4309 W Medical Center Dr Ste B202
McHenry, IL 60050-8417

Phone

(847) 535-6083

Fax

(815) 455-2789

NPI assigned

Sep 6, 2005

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

Other identifiers 1

Electronic endpoints 2

Medicare fee-for-service enrollment

Enrolled in WI, IL2 enrollments

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 2

Specialty

Gastroenterology

Education

Other, 1990

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Agnesian Healthcare IncGroup PAC ID 1658289624, 392 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• SSM Health St Agnes Hospital-Fond Du Lac Hospital, Fond Du Lac, WI, CCN 520088
• Northwestern Medicine McHenry Hospital, McHenry, IL, CCN 140116

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: nsiddiqui528749@direct-ehr-ssmhc.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.

• Agnesian Healthcare, Inc

  • General Acute Care Hospital
  • Fond Du Lac, WI
  • NPI 1346228541
  Medicare reassignment Care Compare group NPD
• Aurora Medical Group, Inc.

  • Certified Registered Nurse Anesthetist
  • Milwaukee, WI
  • NPI 1427271378
  Medicare reassignment NPD
• Marshfield Clinic Inc

  • Clinic/Center
  • Marshfield, WI
  • NPI 1952347981
  Medicare reassignment NPD
• MCHS Hospitals Inc

  • Clinic/Center
  • Marshfield, WI
  • NPI 1093221434
  Medicare reassignment NPD
• Agnesian Healthcare Inc

  • Community/Retail Pharmacy
  • Waupun, WI
  • NPI 1366417917
  NPD
• Agnesian Healthcare Inc

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • Fond Du Lac, WI
  • NPI 1841320884
  NPD
• Aurora Medical Group, Inc.

  • Durable Medical Equipment & Medical Supplies
  • Oshkosh, WI
  • NPI 1326858044
  NPD
• MCHS Hospitals Inc

  • Clinic/Center
  • Stevens Point, WI
  • NPI 1467119784
  NPD
• MCHS Hospitals Inc

  • Durable Medical Equipment & Medical Supplies
  • Eau Claire, WI
  • NPI 1558230847
  NPD
• Ascension Medical Group-Fox Valley Wisconsin, Inc

  • Cardiovascular Disease Physician
  • Appleton, WI
  • NPI 1831890177
  NPD (past)

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

• Northern Illinois Medical Center

  • General Acute Care Hospital
  • McHenry, IL
  • NPI 1982611281
  Care Compare affiliation
• Agnesian Healthcare, Inc

  • General Acute Care Hospital
  • Fond Du Lac, WI
  • NPI 1346228541
  Care Compare affiliation

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

{
    "created_epoch": "1125964800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782259200000",
    "number": "1770577785",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 735044",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606735044",
            "telephone_number": "800-326-2250"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4309 W MEDICAL CENTER DR STE B202",
            "city": "MCHENRY",
            "state": "IL",
            "postal_code": "600508417",
            "telephone_number": "847-535-6083",
            "fax_number": "815-455-2789"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "855 N Westhaven Dr",
            "address_purpose": "LOCATION",
            "city": "Oshkosh",
            "state": "WI",
            "postal_code": "549047668",
            "country_code": "US",
            "telephone_number": "920-303-8700",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "2700 E ENTERPRISE AVE,",
            "address_2": "UNIT C",
            "address_purpose": "LOCATION",
            "city": "APPLETON",
            "state": "WI",
            "postal_code": "54913",
            "country_code": "US",
            "telephone_number": "920-738-7300",
            "fax_number": "920-738-7301",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SIDDIQUI",
        "first_name": "NADEEM",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-09-06",
        "last_updated": "2026-06-24",
        "certification_date": "2026-06-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "WI",
            "license": "35007",
            "primary": false
        },
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "IL",
            "license": "036175750",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "33328600",
            "state": "WI"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "nsiddiqui354939@direct.myadvocateaurora.org",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "855 N Westhaven Dr",
            "city": "Oshkosh",
            "state": "WI",
            "country_code": "US",
            "postal_code": "549047668",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://EpicFHIR.aurora.org/FHIR/MYAURORA/api/FHIR/DSTU2/",
            "affiliation": "N",
            "address_1": "855 N Westhaven Dr",
            "city": "Oshkosh",
            "state": "WI",
            "country_code": "US",
            "postal_code": "549047668",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Michelle Renee Shimek, ACNP, CNP
• Hailey Marie Shoup
• Syed Hasan Shuja, M.D
• Tanzeela Mariam Shuja, M.D.
• Amy Sica
• Joseph T Siecinski, PTA
• Alan J. Simmons, MD
• Cayla Simmons
• Nicolas Simmons
• Aradhya Singh, M.D.

• Gastroenterology Physician in McHenry, IL
• Providers in McHenry, IL by specialty
• Gastroenterology Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 24, 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.
• 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.