Nadeem Siddiqui, MD - Medicare Gastroenterology in Mchenry, IL

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Nadeem Siddiqui, MD is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Mchenry, Illinois. He graduated from medical school in 1990 and has 35 years of diverse experience with area of expertise as Gastroenterology. He is a member of the group practice Agnesian Healthcare Inc and his current practice location is 4309 W Medical Center Dr Ste B202, Mchenry, Illinois. You can reach out to his office (for appointments etc.) via phone at (847) 535-6083.

Nadeem Siddiqui is licensed to practice in Illinois (license number 036175750) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1770577785.

Contact Information

Nadeem Siddiqui, MD
4309 W Medical Center Dr Ste B202,
Mchenry, IL 60050-8417
(847) 535-6083
(815) 455-2789

Map and Direction




Physician's Profile

Full NameNadeem Siddiqui
GenderMale
SpecialityGastroenterology
Experience35 Years
Location4309 W Medical Center Dr Ste B202, Mchenry, Illinois
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Nadeem Siddiqui graduated from medical school in 1990
  NPI Data:
  • NPI Number: 1770577785
  • Provider Enumeration Date: 09/06/2005
  • Last Update Date: 07/03/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 6507862315
  • Enrollment ID: I20061018000040

Medical Identifiers

Medical identifiers for Nadeem Siddiqui such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1770577785NPI-NPPES
33328600MedicaidWI

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RG0100XInternal Medicine - Gastroenterology 35007 (Wisconsin)Secondary
207RG0100XInternal Medicine - Gastroenterology 036175750 (Illinois)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
St Agnes HospitalFond du lac, WIHospital
St Mary's Hospital Medical CenterGreen bay, WIHospital
St Vincent HospitalGreen bay, WIHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Agnesian Healthcare Inc1658289624360

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Nadeem Siddiqui allows following entities to bill medicare on his behalf.
Entity NameAgnesian Healthcare Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1346228541
PECOS PAC ID: 1658289624
Enrollment ID: O20031104000263
Entity NameAurora Medical Group, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1427271378
PECOS PAC ID: 6709794258
Enrollment ID: O20031105000725
Entity NameMarshfield Clinic Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1952347981
PECOS PAC ID: 2264345206
Enrollment ID: O20031106000590
Entity NameSt. Nicholas Hospital-sisters Of The Third Order Of St Francis
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1275799413
PECOS PAC ID: 8325931652
Enrollment ID: O20040202001172
Entity NameSt Vincent Hospital-hospital Sisters-third Order Of St Francis
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1285613638
PECOS PAC ID: 5799694675
Enrollment ID: O20080620000423
Entity NameMchs Hospitals Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1093221434
PECOS PAC ID: 5698071173
Enrollment ID: O20180208000096

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Nadeem Siddiqui is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Nadeem Siddiqui, MD
1726 Shawano Ave,
Green Bay, WI 54303-3216

Ph: (920) 496-4700		Nadeem Siddiqui, MD
4309 W Medical Center Dr Ste B202,
Mchenry, IL 60050-8417

Ph: (847) 535-6083

Reviews and Comments


Internal Medicine Doctors in Mchenry, IL

Pakhadi H Buddhadev, M.D.
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Phone: 815-759-4323    Fax: 815-759-4948
Dr. Prashant Sura, M.D.
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Dr. Cory Edward Mellon, MD
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Parmod Narang, MD
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Dr. Shaji Mariyam Baig, MD
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Practice Location: 4309 W Medical Center Dr Ste A102, Mchenry, IL 60050
Phone: 815-759-4323    
Vishal Garimella, M.B.B.S.
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Medicare: Medicare Enrolled
Practice Location: 4201 Medical Center Drive, Mchenry, IL 60050
Phone: 815-344-5000    
Sneha Kumar,
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Medicare: Not Enrolled in Medicare
Practice Location: 4201 W Medical Center Dr, Mchenry, IL 60050
Phone: 815-344-5000    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.