NPIMap

Individual provider Active NPI

Catherine Louise Ash, M.D.

  • Internal Medicine Physician
  • Edwardsville, IL
National Provider Identifier
1861874059
Registry record updated Dec 18, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
036177442 Issued in IL
Practice address
2122 Troy Rd Ste 130
Edwardsville, IL 62025-2540
Phone
(618) 800-4500
Fax
(618) 800-4501
NPI assigned
Jun 24, 2015
Last updated
Dec 18, 2025By the provider in NPPES
Sex
Female
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Dec 18, 2025

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 2018022561 MO
Internal Medicine Physician 207R00000X 036177442 IL Primary

Addresses

Primary practice location

2122 Troy Rd Ste 130
Edwardsville, IL 62025-2540

Mailing address

'PO Box 959203 St Louis Mo 63195'
Saint Louis, MO 63195-0001
Phone (618) 800-4500

Other practice location 1

6435 Chippewa St
Saint Louis, MO 63109
Phone (314) 366-3000

Other names 1

  • Catherine Louise Duncan Former name

Electronic endpoints 1

TypeEndpointUseAffiliation
FHIR URL https://epicproxy.et0965.epichosted.com/FHIRProxy/api/FHIR/DSTU2 Health Information Exchange (HIE)

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MO, IL2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20180807003033 MO Practitioner - Internal Medicine 4284942806 Reassigns benefits to 7 organizations
I20260415001953 IL Practitioner - Internal Medicine 4284942806 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
Saint Louis University School of Medicine, 2015
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Fairview Heights Medical Group SCGroup PAC ID 6800784083, 448 clinicians
Mercy Clinic East CommunitiesGroup PAC ID 7214827922, 573 clinicians
Aging Well Health Care, LLCGroup PAC ID 1153232038, 236 clinicians

Practice addresses (Care Compare)

2122 Troy Rd
Suite 130
Edwardsville, IL 62025-2540
Phone (618) 463-7600

6435 Chippewa St
Saint Louis, MO 63109-2104
Phone (314) 366-3000

7212 Balson Ave
Saint Louis, MO 63130-3001

Hospital & facility affiliations

Procedures performed for Medicare patients

ProcedureNumber of procedures
Skin biopsy1-10

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
036177442ILMDInternal Medicine Physician
2018022561MOMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Mercy Clinic Adult Hospitalists- Jefferson, LLC Internal Medicine CurrentSince Jul 28, 2019 Accepting new patients
St Anthonys Physician Organization Hospitalist Services, L.C. CurrentSince Jul 28, 2019 Accepting new patients
Mercy Clinic Adult Hospitalists - St. Louis, LLC Internal Medicine CurrentSince Nov 5, 2018 Accepting new patients
Mercy Clinic East Communities Internal Medicine CurrentSince Aug 6, 2018 Accepting new patients
Mercy Hospitals East Communities CurrentSince Nov 18, 2018 Accepting new patients
Mercy Hospitals East Communities CurrentSince Nov 18, 2018 Accepting new patients
Mercy Clinic Adult Hospitalists - Washington, LLC CurrentSince Jul 28, 2019 Accepting new patients
Mercy Hospital Lincoln Internal Medicine CurrentSince Jul 28, 2019 Accepting new patients
Fairview Heights Medical Group SC PastSince Dec 21, 2025 Accepting new patients
Fairview Heights Medical Group SC PastSince Aug 15, 2023 Accepting new patients

Locations

1400 US Highway 61
Crystal Cty, MO 63028
Phone (636) 933-1111

10010 Kennerly Rd
Saint Louis, MO 63128
Phone (314) 525-1328

615 S New Ballas Rd
Saint Louis, MO 63141
Phone (314) 251-4687

615 S New Ballas Rd
#H
Saint Louis, MO 63141
Phone (314) 251-6075

621 S New Ballas Rd
Ste 4017B
Saint Louis, MO 63141
Phone (314) 872-9192

6435 Chippewa St
Saint Louis, MO 63109
Phone (314) 353-1870

900 E Cherry St
Troy, MO 63379
Phone (636) 528-8585

901 E 5th St
Washington, MO 63090
Phone (636) 239-8000

Interoperability endpoints

  • Direct secure messaging: cash704366@directc.mercy.net

Organizations & group practices 11

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 7

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": "1435104000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1766016000000",
    "number": "1861874059",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "'PO BOX 959203 ST LOUIS MO 63195'",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631950001",
            "telephone_number": "618-800-4500",
            "fax_number": "618-800-4501"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2122 TROY RD STE 130",
            "city": "EDWARDSVILLE",
            "state": "IL",
            "postal_code": "620252540",
            "telephone_number": "618-800-4500",
            "fax_number": "618-800-4501"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "6435 Chippewa St",
            "address_purpose": "LOCATION",
            "city": "Saint Louis",
            "state": "MO",
            "postal_code": "63109",
            "country_code": "US",
            "telephone_number": "314-366-3000",
            "fax_number": "314-366-3001",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ASH",
        "first_name": "CATHERINE",
        "middle_name": "LOUISE",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2015-06-24",
        "last_updated": "2025-12-18",
        "certification_date": "2025-12-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MO",
            "license": "2018022561",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036177442",
            "primary": true
        }
    ],
    "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": "2122 Troy Rd Ste 130",
            "city": "Edwardsville",
            "state": "IL",
            "country_code": "US",
            "postal_code": "620252540",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "CATHERINE",
            "last_name": "DUNCAN",
            "middle_name": "LOUISE",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

Other providers in Edwardsville, IL

Sources for this page

Verify at the official NPI Registry.