Dr Mary Johanna Clark, DO - Medicare Internal Medicine in La Crosse, WI

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Dr Mary Johanna Clark, DO is a medicare enrolled "Internal Medicine" physician in La Crosse, Wisconsin. She graduated from medical school in 1987 and has 39 years of diverse experience with area of expertise as Internal Medicine. She is a member of the group practice Mayo Clinic Health System-southwest Wisconsin Region Inc and her current practice location is 700 West Ave S, La Crosse, Wisconsin. You can reach out to her office (for appointments etc.) via phone at (608) 785-0940.

Dr Mary Johanna Clark is licensed to practice in Wisconsin (license number 81803) 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 1912917949.

Contact Information

Dr Mary Johanna Clark, DO
700 West Ave S,
La Crosse, WI 54601-8806
(608) 785-0940
Not Available

Map and Direction




Physician's Profile

Full NameDr Mary Johanna Clark
GenderFemale
SpecialityInternal Medicine
Experience39 Years
Location700 West Ave S, La Crosse, Wisconsin
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:
  • Dr Mary Johanna Clark graduated from medical school in 1987
  NPI Data:
  • NPI Number: 1912917949
  • Provider Enumeration Date: 08/09/2006
  • Last Update Date: 10/16/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 5597654186
  • Enrollment ID: I20251014001484

Medical Identifiers

Medical identifiers for Dr Mary Johanna Clark such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1912917949NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 81803 (Wisconsin)Primary
207R00000XInternal Medicine 29800 (Colorado)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Recover HealthRochester, MNHome health agency
Recover Health Of Wisconsin IncLa crosse, WIHome health agency
Mayo Clinic Health System-franciscan Medical Center IncLa crosse, WIHospital
Mayo Clinic Hlth Systm Franciscan Hlthcare SpartaSparta, WIHospital
Gundersen Lutheran Medical CenterLa crosse, WIHospital
Lakeview Health CenterWest salem, WINursing home

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Mayo Clinic Health System-southwest Wisconsin Region Inc0345152443555

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. Dr Mary Johanna Clark 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
Dr Mary Johanna Clark, DO
Po Box 860912,
Minneapolis, MN 55486-0912

Ph: (608) 785-0940		Dr Mary Johanna Clark, DO
700 West Ave S,
La Crosse, WI 54601-8806

Ph: (608) 785-0940

Reviews and Comments


Internal Medicine Doctors in La Crosse, WI

Mary K Frohnauer, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-775-2021    
Derek A Hupp,
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-782-7300    
Madeline Rita Fasen, DO
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 800 West Ave S, La Crosse, WI 54601
Phone: 608-785-0940    
Allen C. Foster, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-782-7300    
Padmavathi Mali, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-782-7300    
Emily Catherine Dolan, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-782-7300    
Adie D Harbin Iii, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-782-7300    

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.