NPIMap

Individual provider Active NPI

William Sauer, MD

  • Clinical Cardiac Electrophysiology Physician
  • Chicago, IL
National Provider Identifier
1609827583
Registry record updated Jul 21, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Clinical Cardiac Electrophysiology PhysicianTaxonomy code 207RC0001X
License
036177896 Issued in IL
Practice address
5841 S Maryland Ave
Chicago, IL 60637-1443
Phone
(888) 824-0200
NPI assigned
May 15, 2006
Last updated
Jul 21, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 21, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Clinical Cardiac Electrophysiology Physician 207RC0001X 036177896 IL Primary
Cardiovascular Disease Physician 207RC0000X 036177896 IL

Addresses

Primary practice location

5841 S Maryland Ave
Chicago, IL 60637-1443

Mailing address

150 Harvester Dr Ste 300
Burr Ridge, IL 60527-5965

Other identifiers 1

IdentifierTypeStateIssuer
07354312MedicaidCO

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20190401000757 MA Practitioner - Cardiac ElectrophysiologyPractitioner - Cardiovascular Disease (Cardiology) 4688663990 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Cardiac ElectrophysiologyAlso: Cardiovascular Disease (Cardiology)
Education
Other, 1999
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices

Practice addresses (Care Compare)

75 Francis St
Boston, MA 02115-6110
Phone (617) 732-5500

Hospital & facility affiliations

Procedures performed for Medicare patients

ProcedureNumber of procedures
Pacemaker insertion or repair17

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
277640MAMDCardiovascular Disease Physician
44281COMDClinical Cardiac Electrophysiology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Brigham & Womens Physicians Organization Inc CurrentSince Mar 19, 2019 Accepting new patients
Brigham and Women's Hospital Current Accepting new patients
Brigham and Womens Physicians Organization Inc Past Accepting new patients
Grand View Hospital Cardiovascular Disease Past Accepting new patients

Locations

75 Francis St
Boston, MA 02115

375 Boylston St
Brookline, MA 02445
Phone (508) 718-4010

1153 Centre St
Jamaica Plain, MA 02130
Phone (617) 983-7000

Interoperability endpoints

  • Direct secure messaging: sauer.william.bwh@direct.partners.masshiway.net

Organizations & group practices 4

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

Hospital & facility affiliations 6

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

NPI Registry JSON

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

{
    "created_epoch": "1147651200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1784592000000",
    "number": "1609827583",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "150 HARVESTER DR STE 300",
            "city": "BURR RIDGE",
            "state": "IL",
            "postal_code": "605275965"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5841 S MARYLAND AVE",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606371443",
            "telephone_number": "888-824-0200"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SAUER",
        "first_name": "WILLIAM",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-05-15",
        "last_updated": "2026-07-21",
        "certification_date": "2026-07-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RC0001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Clinical Cardiac Electrophysiology",
            "state": "IL",
            "license": "036177896",
            "primary": true
        },
        {
            "code": "207RC0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Cardiovascular Disease",
            "state": "IL",
            "license": "036177896",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "07354312",
            "state": "CO"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Chicago, IL

Sources for this page

Verify at the official NPI Registry.