NPIMap

Individual provider Active NPI

Sean Anthony Cassleman, DO

  • Internal Medicine Physician
  • Saint Clair Shores, MI
National Provider Identifier
1720404775
Registry record updated Nov 1, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
5101020867 Issued in MI
Practice address
21000 E 12 Mile Rd
Saint Clair Shores, MI 48081-1116
Phone
(313) 598-0799
NPI assigned
Mar 14, 2014
Last updated
Nov 1, 2025By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Nov 1, 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 5101020867 MI Primary

Addresses

Primary practice location

21000 E 12 Mile Rd
Saint Clair Shores, MI 48081-1116

Mailing address

1025 Bishop Rd
Grosse Pointe Park, MI 48230-1447
Phone (313) 598-0799

Other practice location 1

21444 Harper Ave
Saint Clair Shores, MI 48080-2244
Phone (586) 200-4265

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MI
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
I20170810003033 MI Practitioner - Internal Medicine 8325322928 Reassigns benefits to 4 organizations

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
Michigan State University College of Osteopathic Medicine, 2014
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Henry Ford Semi Medical GroupGroup PAC ID 0648180406, 246 clinicians

Practice addresses (Care Compare)

21000 E 12 Mile Rd
Suite 105
Saint Clair Shores, MI 48081-1156
Phone (586) 498-3610

Hospital & facility affiliations

National Provider Directory

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

Practice roles

OrganizationSpecialtyStatusNew patients
Henry Ford Health St. John Hospital CurrentSince Aug 1, 2018 Accepting new patients
Metabolic Medicine Lab PLLC CurrentSince Aug 1, 2025 Accepting new patients
Henry Ford Health St. John Hospital Current Accepting new patients
Henry Ford Semi Medical Group CurrentSince Aug 1, 2017 Accepting new patients
Henry Ford Semi Medical Group Internal Medicine CurrentSince Aug 1, 2017 Accepting new patients
Henry Ford Health St. John Hospital Internal Medicine CurrentSince Aug 1, 2018 Accepting new patients
Seton Health Corporation of Southeastern Michigan CurrentSince Apr 15, 2018 Accepting new patients
Seton Health Corporation of Southeastern Michigan Internal Medicine CurrentSince Apr 15, 2018 Accepting new patients
Henry Ford Semi Medical Group Internal Medicine Current Accepting new patients
Ascension Macomb Oakland Hospital Past Accepting new patients

Locations

17141 Kercheval Ave
Grosse Pointe, MI 48230
Phone (313) 642-4980

46591 Romeo Plank Rd
Macomb, MI 48044
Phone (586) 226-6269

22255 Greenfield Rd
Ste 550
Southfield, MI 48075
Phone (586) 226-6161

21444 Harper Ave
St Clair Shrs, MI 48080
Phone (586) 200-4265

21000 E 12 Mile Rd
St Clr Shores, MI 48081
Phone (586) 447-5000

21000 E 12 Mile Rd
Ste 105
St Clr Shores, MI 48081
Phone (586) 498-3606

37771 Schoenherr Rd
Ste 104
Sterling Hts, MI 48312
Phone (810) 286-0050

30117 Schoenherr Rd
Ste 400
Warren, MI 48088
Phone (586) 552-4848

Interoperability endpoints

  • Direct secure messaging: scassleman1120492@direct.hfhs.org
  • Direct secure messaging: sean.cassleman.1@33847.direct.athenahealth.com

Organizations & group practices 10

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 8

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": "1394755200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761955200000",
    "number": "1720404775",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1025 BISHOP RD",
            "city": "GROSSE POINTE PARK",
            "state": "MI",
            "postal_code": "482301447",
            "telephone_number": "313-598-0799"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "21000 E 12 MILE RD",
            "city": "SAINT CLAIR SHORES",
            "state": "MI",
            "postal_code": "480811116",
            "telephone_number": "313-598-0799"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "21444 Harper Ave",
            "address_purpose": "LOCATION",
            "city": "Saint Clair Shores",
            "state": "MI",
            "postal_code": "480802244",
            "country_code": "US",
            "telephone_number": "586-200-4265",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "CASSLEMAN",
        "first_name": "SEAN",
        "middle_name": "ANTHONY",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2014-03-14",
        "last_updated": "2025-11-01",
        "certification_date": "2025-11-01",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MI",
            "license": "5101020867",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Saint Clair Shores, MI

Sources for this page

Verify at the official NPI Registry.