NPIMap

Individual provider Active NPI

Seng M Leong, MD

  • Internal Medicine Physician
  • Barrington, IL
National Provider Identifier
1487750790
Registry record updated Mar 31, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
036-055809 Issued in IL
Practice address
27750 W Highway 22
Barrington, IL 60010-2379
Phone
(847) 381-5800
Fax
(847) 381-5873
NPI assigned
Sep 15, 2006
Sex
Male
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Mar 31, 2025

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 036-055809 IL Primary

Addresses

Primary practice location

27750 W Highway 22
Barrington, IL 60010-2379

Mailing address

29373 Network PL
Chicago, IL 60673-1293
Phone (847) 390-5900

Other identifiers 4

IdentifierTypeStateIssuer
L96137OtherILMEDICARE ID
110209671OtherILRAILROAD MEDICARE
CH2241OtherILRAIL ROAD MEDICARE GROUP
03655809MedicaidIL

Electronic endpoints 2

TypeEndpointUseAffiliation
Direct Messaging Address sleong206401@direct.myadvocateaurora.org Direct
FHIR URL https://EpicFHIR.aurora.org/FHIR/MYAURORA

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in IL
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
I20100130000127 IL Practitioner - Internal Medicine 8022151083 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
Other, 1969
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Advocate Health and Hospitals CorporationGroup PAC ID 7810800935, 3,081 clinicians

Practice addresses (Care Compare)

214 McHenry Rd
Buffalo Grove, IL 60089-6748
Phone (847) 459-1160

27750 W Hwy 22
Suite 220
Barrington, IL 60010-1924
Phone (815) 206-5700

27750 W Hwy 22 240
Barrington, IL 60010-1924
Phone (847) 842-7540

27790 W Hwy 22
Barrington, IL 60010-2396

350 Surryse Rd
Suite 100
Lake Zurich, IL 60047-3217
Phone (847) 438-2144

450 W Hwy 22
Neonatology
Barrington, IL 60010-1919
Phone (847) 381-0123

Hospital & facility affiliations

  • Advocate Home Health Care Serv Home health agency, Oakbrook, IL, CCN 147150
  • Centerwell Home Health II Home health agency, Buffalo Grove, IL, CCN 147979
  • Home Care Experts Home health agency, Burr Ridge, IL, CCN 147730
  • Advocate Good Shepherd Hospital Hospital, Barrington, IL, CCN 140291
  • Advocate Sherman Hospital Hospital, Elgin, IL, CCN 140030
  • Northwestern Medicine McHenry Hospital, McHenry, IL, CCN 140116
  • Advocate Condell Medical Center Hospital, Libertyville, IL, CCN 140202
  • Northwestern Medicine Central Dupage Hospital Hospital, Winfield, IL, CCN 140242

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
036-055809ILMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Advocate Health & Hospitals Corporation CurrentSince Jan 1, 2000 Accepting new patients
Advocate Health and Hospitals Corporation CurrentSince Jan 1, 2000 Accepting new patients
Advocate Health and Hospitals Corporation Current Accepting new patients

Locations

27750 W Il Route 22
Ste 240
Barrington, IL 60010
Phone (847) 381-5800

27750 W Il Route 22
Barrington, IL 60010
Phone (847) 381-4880

27790 W Il Route 22
Ste 16
Barrington, IL 60010
Phone (847) 381-5800

214 McHenry Rd
Buffalo Grove, IL 60089
Phone (847) 459-1160

135 N Arlington Heights Rd
Buffalo Grove, IL 60089
Phone (847) 215-8866

29373 Network Pl
Chicago, IL 60673

Interoperability endpoints

  • Direct secure messaging: sleong206401@direct.myadvocateaurora.org

Organizations & group practices 3

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.

Hospital & facility affiliations 14

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

View all 14

NPI Registry JSON

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

{
    "created_epoch": "1158278400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1743379200000",
    "number": "1487750790",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "29373 NETWORK PL",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606731293",
            "telephone_number": "847-390-5900"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "27750 W HIGHWAY 22",
            "city": "BARRINGTON",
            "state": "IL",
            "postal_code": "600102379",
            "telephone_number": "847-381-5800",
            "fax_number": "847-381-5873"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "LEONG",
        "first_name": "SENG",
        "middle_name": "M",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2006-09-15",
        "last_updated": "2025-03-31",
        "certification_date": "2025-03-31",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036-055809",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDICARE ID",
            "identifier": "L96137",
            "state": "IL"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD MEDICARE",
            "identifier": "110209671",
            "state": "IL"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAIL ROAD MEDICARE GROUP",
            "identifier": "CH2241",
            "state": "IL"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "03655809",
            "state": "IL"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "sleong206401@direct.myadvocateaurora.org",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "27750 W Highway 22",
            "city": "Barrington",
            "state": "IL",
            "country_code": "US",
            "postal_code": "600102379",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://EpicFHIR.aurora.org/FHIR/MYAURORA",
            "affiliation": "N",
            "address_1": "27750 W Highway 22",
            "city": "Barrington",
            "state": "IL",
            "country_code": "US",
            "postal_code": "600102379",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Barrington, IL

Sources for this page

Verify at the official NPI Registry.