Gary David Koenig, M.D.

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

MDR3G44 Issued in MO

Practice address

100 Village SQ
Hazelwood, MO 63042-1820

Phone

(314) 355-4010

Fax

(314) 355-9484

NPI assigned

Aug 25, 2005

Last updated

Feb 16, 2026By the provider in NPPES

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

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in MO

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

GastroenterologyAlso: Internal Medicine

Education

Saint Louis University School of Medicine, 1986

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Physician Groups LCGroup PAC ID 3072421254, 526 clinicians

Mercy Clinic Gastroenterology LLCGroup PAC ID 8628121795, 66 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Barnes-Jewish St Peters Hospital Hospital, Saint Peters, MO, CCN 260191
• Progress West Hospital Hospital, Ofallon, MO, CCN 260219
• Mercy Hospital Washington Hospital, Washington, MO, CCN 260052

Merit-based Incentive Payment System (MIPS)

Final score

86.37 of 100Reported as group

Quality

79.66

Promoting interoperability

98

Improvement activities

40

Cost

76.57

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: gary.koenig.p1@direct.essehealth.nextgenshare.com

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.

• Mercy Clinic Gastroenterology, LLC

  • Gastroenterology Physician
  • Saint Louis, MO
  • NPI 1528295334
  Medicare reassignment Care Compare group NPD
• Physician Groups LC

  • Multi-Specialty Clinic/Center
  • Saint Louis, MO
  • NPI 1285664268

  Gastroenterology

  Medicare reassignment Care Compare group NPD
• Digestive Care Consultants, Inc

  • Gastroenterology Physician
  • Hazelwood, MO
  • NPI 1427175645
  Authorized official Same address or phone
• Physician Groups LC

  dba Medical Arts Clinic

  • Multi-Specialty Clinic/Center
  • Farmington, MO
  • NPI 1427114990
  NPD

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

• Barnes Jewish St Peters Hospital Inc

  dba Barnes-Jewish St Peters Hospital

  • General Acute Care Hospital
  • Saint Peters, MO
  • NPI 1144238908
  Care Compare affiliation
• Mercy Hospitals East Communities

  dba Mercy Hospital Washington

  • General Acute Care Hospital
  • Washington, MO
  • NPI 1285664177
  Care Compare affiliation
• Progress West Healthcare Center

  • General Acute Care Hospital
  • O'Fallon, MO
  • NPI 1508938044
  Care Compare affiliation

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

{
    "created_epoch": "1124928000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771200000000",
    "number": "1861485724",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 23340",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631563340",
            "telephone_number": "314-355-4010",
            "fax_number": "314-355-9484"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 VILLAGE SQ",
            "city": "HAZELWOOD",
            "state": "MO",
            "postal_code": "630421820",
            "telephone_number": "314-355-4010",
            "fax_number": "314-355-9484"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "20 Progress Point Pkwy Ste 206",
            "address_purpose": "LOCATION",
            "city": "O Fallon",
            "state": "MO",
            "postal_code": "633682207",
            "country_code": "US",
            "telephone_number": "636-344-1073",
            "fax_number": "636-916-9953",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "KOENIG",
        "first_name": "GARY",
        "middle_name": "DAVID",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2005-08-25",
        "last_updated": "2026-02-16",
        "certification_date": "2026-02-16",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "MO",
            "license": "MDR3G44",
            "primary": true
        },
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "MO",
            "license": "RG344",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "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": "20 Progress Point Pkwy Ste 206",
            "city": "O Fallon",
            "state": "MO",
            "country_code": "US",
            "postal_code": "633682207",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Kathleen A Kleinschmidt, MS-CCC-SLP
• Richard D Knight, MD
• Shirley M Knight, M.D.
• Christy Kobernus
• Jerome Ernst Kock, D.C.
• Theodore Kremer, M.D.
• Kristy Cobillas LPC LLC (Counseling Associates of Greater St. Louis)
• Elsie Krueger, BCBA
• Ariel L Kuhn
• Natali Ann Kummer, OTR/L

• Gastroenterology Physician in Hazelwood, MO
• Providers in Hazelwood, MO by specialty
• Gastroenterology Physician in Missouri

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 16, 2026; 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.