Michael Ansstas, M.D.

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

2012032351 Issued in MO

Practice address

11155 Dunn Rd Ste 309E
Saint Louis, MO 63136-6111

Phone

(314) 953-8799

NPI assigned

Apr 17, 2012

Sex

Male

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Electronic endpoints 2

Medicare fee-for-service enrollment

Enrolled in MO, IL, GA3 enrollments

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 3

Specialty

GastroenterologyAlso: Allergy/Immunology, Internal Medicine

Education

Other, 2002

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Archbold Medical Group, Inc.Group PAC ID 8123196383, 80 clinicians

HSHS Medical Group IncGroup PAC ID 5092857821, 212 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• HSHS St Elizabeth'S Hospital Hospital, O Fallon, IL, CCN 140187
• Archbold Memorial Hospital Hospital, Thomasville, GA, CCN 110038
• Memorial Hospital Hospital, Belleville, IL, CCN 140185

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2/

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.

• Archbold Medical Group, Inc.

  • Surgery Physician
  • Thomasville, GA
  • NPI 1831353036

  GA

  Medicare reassignment Care Compare group NPD
• HSHS Medical Group Inc

  • Multi-Specialty Clinic/Center
  • Springfield, IL
  • NPI 1962644807

  IL

  Medicare reassignment Care Compare group NPD
• Mercy Clinic Gastroenterology, LLC

  • Gastroenterology Physician
  • Saint Louis, MO
  • NPI 1528295334

  Gastroenterology, MO

  Medicare reassignment NPD
• HSHS Medical Group Inc

  • Rural Health Clinic/Center
  • Dieterich, IL
  • NPI 1033841192
  Care Compare group NPD
• HSHS Medical Group Inc

  • Rural Health Clinic/Center
  • Effingham, IL
  • NPI 1265904486
  Care Compare group
• HSHS Medical Group Inc

  • Durable Medical Equipment & Medical Supplies
  • Springfield, IL
  • NPI 1467849257
  Care Compare group
• HSHS Medical Group Inc

  • Durable Medical Equipment & Medical Supplies
  • Jacksonville, IL
  • NPI 1629465414
  Care Compare group
• HSHS Medical Group Inc

  • Rural Health Clinic/Center
  • Altamont, IL
  • NPI 1679108351
  Care Compare group
• HSHS Medical Group Inc

  • Rural Health Clinic/Center
  • Newton, IL
  • NPI 1679236533
  Care Compare group
• HSHS Medical Group Inc

  • Durable Medical Equipment & Medical Supplies
  • Breese, IL
  • NPI 1740677533
  Care Compare group
• HSHS Medical Group Inc

  • Rural Health Clinic/Center
  • Highland, IL
  • NPI 1851536296
  Care Compare group
• Archbold Medical Group, Inc.

  • Pulmonary Disease Physician
  • Thomasville, GA
  • NPI 1972097293
  NPD

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

• John D Archbold Memorial Hospital Inc

  • General Acute Care Hospital
  • Thomasville, GA
  • NPI 1194779702

  Hospital

  Care Compare affiliation
• John D. Archbold Memorial Hospital, Inc.

  • Rehabilitation Hospital Unit
  • Thomasville, GA
  • NPI 1104867738

  Hospital

  Care Compare affiliation
• Protestant Memorial Medical Center, Inc.

  • General Acute Care Hospital
  • Belleville, IL
  • NPI 1982796181

  Hospital

  Care Compare affiliation
• St Elizabeths Hospital of the Hospital Sisters of the Third Order

  • General Acute Care Hospital
  • O Fallon, IL
  • NPI 1629057302

  Hospital

  Care Compare affiliation

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

{
    "created_epoch": "1334620800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761523200000",
    "number": "1851658728",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "11155 DUNN RD STE 309E",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631366111",
            "telephone_number": "314-953-8799"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "11155 DUNN RD STE 309E",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631366111",
            "telephone_number": "314-953-8799"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "4 Memorial Dr Ste 230B",
            "address_purpose": "LOCATION",
            "city": "Alton",
            "state": "IL",
            "postal_code": "620026705",
            "country_code": "US",
            "telephone_number": "618-463-7874",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "3 Saint Elizabeth Blvd",
            "address_purpose": "LOCATION",
            "city": "O Fallon",
            "state": "IL",
            "postal_code": "622691281",
            "country_code": "US",
            "telephone_number": "618-641-5803",
            "fax_number": "618-607-5116",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ANSSTAS",
        "first_name": "MICHAEL",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2012-04-17",
        "last_updated": "2025-10-27",
        "certification_date": "2025-10-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "IL",
            "license": "036153515",
            "primary": false
        },
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "MO",
            "license": "2012032351",
            "primary": true
        },
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CA",
            "license": "A160085",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "mansstas218436@ewd.direct.hshs.org",
            "affiliation": "N",
            "address_1": "3 Saint Elizabeth Blvd",
            "city": "O Fallon",
            "state": "IL",
            "country_code": "US",
            "postal_code": "622691281",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2/",
            "affiliation": "N",
            "endpointDescription": "BJC",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "CSV",
            "contentTypeDescription": "CSV",
            "address_1": "11155 Dunn Rd Ste 309E",
            "city": "Saint Louis",
            "state": "MO",
            "country_code": "US",
            "postal_code": "631366111",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Waseem Ansari, M.D.
• Rebecca Ansley
• Amanda Marie Anson, RN, FNP
• Laura Anson, OT
• George Ansstas, MD
• Anstey Internal Medicine PC
• John Thomas Anstey, M.D.
• Esen Antakli, AGNP
• Amy E Antalick, CRNA
• Anthony J Tegenkamp,DMD,LLC

• All providers in Saint Louis, MO
• Gastroenterology Physician in Missouri

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 27, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; 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.