Catherine Louise Ash, MD - Medicare Internal Medicine in Edwardsville, IL

  1. Home
  2. Internal Medicine
  3. IL
  4. Edwardsville
Catherine Louise Ash, MD is a medicare enrolled "Internal Medicine" physician in Edwardsville, Illinois. She went to Saint Louis University School Of Medicine and graduated in 2015 and has 11 years of diverse experience with area of expertise as Internal Medicine. She is a member of the group practice Mercy Clinic East Communities and her current practice location is 2122 Troy Rd Ste 130, Edwardsville, Illinois. You can reach out to her office (for appointments etc.) via phone at (618) 800-4500.

Catherine Louise Ash is licensed to practice in Illinois (license number 036177442) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1861874059.

Contact Information

Catherine Louise Ash, MD
2122 Troy Rd Ste 130,
Edwardsville, IL 62025-2540
(618) 800-4500
(618) 800-4501

Map and Direction




Physician's Profile

Full NameCatherine Louise Ash
GenderFemale
SpecialityInternal Medicine
Experience11 Years
Location2122 Troy Rd Ste 130, Edwardsville, Illinois
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Catherine Louise Ash attended and graduated from Saint Louis University School Of Medicine in 2015
  NPI Data:
  • NPI Number: 1861874059
  • Provider Enumeration Date: 06/24/2015
  • Last Update Date: 12/18/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 4284942806
  • Enrollment ID: I20180807003033

Medical Identifiers

Medical identifiers for Catherine Louise Ash such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1861874059NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 2018022561 (Missouri)Secondary
207R00000XInternal Medicine 036177442 (Illinois)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Mercy Hospital St LouisSaint louis, MOHospital
Mercy Hospital SouthSaint louis, MOHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Mercy Clinic East Communities7214827922535

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Catherine Louise Ash allows following entities to bill medicare on her behalf.
Entity NameMercy Hospitals East Communities
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1851431738
PECOS PAC ID: 1658276811
Enrollment ID: O20031218000107
Entity NameMercy Clinic Adult Hospitalists - St. Louis, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1841235108
PECOS PAC ID: 6002809944
Enrollment ID: O20040406001004
Entity NameMercy Clinic East Communities
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1851335228
PECOS PAC ID: 7214827922
Enrollment ID: O20070521000006
Entity NameMercy Clinic Adult Hospitalists - Washington, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1891943429
PECOS PAC ID: 3577630540
Enrollment ID: O20080917000782
Entity NameSt Anthonys Physician Organization Hospitalist Services Lc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1407216336
PECOS PAC ID: 5092980656
Enrollment ID: O20111208000771
Entity NameMercy Clinic Adult Hospitalists Jefferson Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1083052492
PECOS PAC ID: 8628205598
Enrollment ID: O20131220001798
Entity NameMercy Hospital Lincoln
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1962808733
PECOS PAC ID: 5193040020
Enrollment ID: O20150623002541

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Catherine Louise Ash is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Catherine Louise Ash, MD
'po Box 959203 St Louis Mo 63195',
Saint Louis, MO 63195-0001

Ph: (618) 800-4500		Catherine Louise Ash, MD
2122 Troy Rd Ste 130,
Edwardsville, IL 62025-2540

Ph: (618) 800-4500

Reviews and Comments


Internal Medicine Doctors in Edwardsville, IL

Kelly A. Rourke, M.D.
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 108 Gateway Commerce Center Dr N, Edwardsville, IL 62025
Phone: 618-219-7470    
David S Lotsoff, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2122 Troy Rd Ste 130, Edwardsville, IL 62025
Phone: 618-800-4595    
Nueki Naate, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1188 South State Route 157, Edwardsville, IL 62025
Phone: 618-692-5900    
Dr. William Bonzelet, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: Seven 157 Center, Edwardsville, IL 62025
Phone: 618-659-2371    Fax: 618-659-2375
Dr. David Brian Yablonsky, D.O.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1181 State Rt 157 Suite 200, Edwardsville, IL 62025
Phone: 618-288-8850    Fax: 618-288-8943

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.