Dheeraj Mahajan, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

036106392 Issued in IL

Practice address

101 Madison St Ste 300
Oak Park, IL 60302-4210

Phone

(708) 486-2700

Fax

(708) 486-2700

NPI assigned

Jun 15, 2006

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Other identifiers 1

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

Specialty

Internal Medicine

Education

Other, 1997

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Cimpar SCGroup PAC ID 3577578798, 35 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Loyola University Medical Center Hospital, Maywood, IL, CCN 140276
• Citadel at Casa Scalabrini Nursing home, Northlake, IL, CCN 145956
• Paul House & Health CR Ctr Nursing home, Chicago, IL, CCN 145767

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

All facility ownership & control disclosures 3

Facilities whose Medicare enrollment lists this provider’s PECOS associate ID as an owner or managing party.

Owned or controlled facilities with NPI records 3

Facilities whose Medicare enrollment lists this provider as an owner, officer, director or managing party.

• British Home for Retired Men and Women

  • Skilled Nursing Facility
  • Brookfield, IL
  • NPI 1922152859

  Adp of the SNF, Operational/Managerial Control

  CMS ownership
• Cimpar at Home, LLC

  • Home Health Agency
  • Oak Park, IL
  • NPI 1013767276

  5% Or Greater Direct Ownership Interest

  CMS ownership
• Paul House & Health Care Center LLC

  • Skilled Nursing Facility
  • Chicago, IL
  • NPI 1376182238

  Adp of the SNF, Operational/Managerial Control

  CMS ownership

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.

• Cimpar, S.C.

  • Internal Medicine Physician
  • Oak Park, IL
  • NPI 1467496224

  Multi-Specialty

  Medicare reassignment Care Compare group NPD Authorized official
• Cimpar Consulting, LLC

  • Specialist
  • Oak Park, IL
  • NPI 1861713216

  Multi-Specialty

  Medicare reassignment NPD Authorized official
• Advocate Health and Hospitals Corporation

  • Multi-Specialty Clinic/Center
  • Oak Brook, IL
  • NPI 1700824455
  Medicare reassignment NPD
• Insight Chicago, Inc.

  • Internal Medicine Physician
  • Chicago, IL
  • NPI 1881261006

  Multi-Specialty

  Medicare reassignment NPD
• Reya Rehab LLC

  • Comprehensive Outpatient Rehabilitation Facility (CORF)
  • Melrose Park, IL
  • NPI 1952199978
  Medicare reassignment NPD
• Cimpar at Home, LLC

  • Home Health Agency
  • Oak Park, IL
  • NPI 1013767276
  NPD (past) Authorized official
• Advocate Health and Hospitals Corporation

  • Children's Hospital
  • Oak Lawn, IL
  • NPI 1508315516
  NPD
• Cimpar Diagnostics LLC

  • Diagnostic Radiology Physician
  • Oak Park, IL
  • NPI 1275233108
  NPD
• Insight Chicago, Inc.

  • Rehabilitation Hospital Unit
  • Chicago, IL
  • NPI 1154308518
  NPD
• Cimpar Clinical Laboratories, LLC

  • Clinical Medical Laboratory
  • Melrose Park, IL
  • NPI 1497577027
  NPD (past)
• Cimpar Pharmacy Oak Park, LLC

  • Community/Retail Pharmacy
  • Oak Park, IL
  • NPI 1609634245
  NPD (past)
• Prime Medical Associates LTD

  • Family Medicine Physician
  • Chicago, IL
  • NPI 1306052675

  Multi-Specialty

  NPD (past)

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

• Citadel at Casa Scalabrini LLC

  • Skilled Nursing Facility
  • Northlake, IL
  • NPI 1023859048

  Nursing home

  Care Compare affiliation
• Loyola University Medical Center

  • General Acute Care Hospital
  • Maywood, IL
  • NPI 1376521575
  Care Compare affiliation
• Loyola University Medical Center

  • General Acute Care Hospital
  • Tinley Park, IL
  • NPI 1427752013
  Care Compare affiliation
• Paul House & Health Care Center LLC

  • Skilled Nursing Facility
  • Chicago, IL
  • NPI 1376182238

  Nursing home

  Care Compare affiliation

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

{
    "created_epoch": "1150329600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1773705600000",
    "number": "1831133693",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "101 MADISON ST STE 300",
            "city": "OAK PARK",
            "state": "IL",
            "postal_code": "603024210",
            "telephone_number": "708-486-2700",
            "fax_number": "708-486-2702"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "101 MADISON ST STE 300",
            "city": "OAK PARK",
            "state": "IL",
            "postal_code": "603024210",
            "telephone_number": "708-486-2700",
            "fax_number": "708-486-2700"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MAHAJAN",
        "first_name": "DHEERAJ",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2006-06-15",
        "last_updated": "2026-03-17",
        "certification_date": "2026-03-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036106392",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036-106392",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "036106392",
            "state": "IL"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Madison Skerritt PLLC
• Madison St Home Health LLC
• Morgan Nicole Madison, M.D.
• Maria Magana, LCP
• Marla Magnetta, OTR/L, CHT
• Renu R Mahajan, MD
• Darren Maiden
• Ivy Maina, BCBA
• Ashok Kumar Maini
• Lisa M Makely, LCSW

• Internal Medicine Physician in Oak Park, IL
• Providers in Oak Park, 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 Mar 17, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; facility enrollments, owners and changes of ownership; Provider of Services certification data; 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.