John William Frey, DO - Medicare Internal Medicine in La Crosse, WI

John William Frey, DO is a medicare enrolled "Internal Medicine - Pulmonary Disease" physician in La Crosse, Wisconsin. His current practice location is 700 West Ave South, La Crosse, Wisconsin. You can reach out to his office (for appointments etc.) via phone at (608) 785-0940.

John William Frey is licensed to practice in Wisconsin (license number 81144) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1538600754.

Contact Information

John William Frey, DO
700 West Ave South,
La Crosse, WI 54601-8806
(608) 785-0940
Not Available

Map and Direction




Physician's Profile

Full NameJohn William Frey
GenderMale
SpecialityInternal Medicine - Pulmonary Disease
Location700 West Ave South, La Crosse, Wisconsin
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1538600754
  • Provider Enumeration Date: 03/20/2017
  • Last Update Date: 09/08/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 4688946247
  • Enrollment ID: I20230530001917

Medical Identifiers

Medical identifiers for John William Frey such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1538600754NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RP1001XInternal Medicine - Pulmonary Disease 94-09289 (Kansas)Secondary
207RP1001XInternal Medicine - Pulmonary Disease 81144 (Wisconsin)Primary
207R00000XInternal Medicine 94-09289 (Kansas)Secondary
207RC0200XInternal Medicine - Critical Care Medicine 81144 (Wisconsin)Secondary

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. John William Frey allows following entities to bill medicare on his behalf.
Entity NameMayo Clinic Health System-southwest Wisconsin Region Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1629056049
PECOS PAC ID: 0345152443
Enrollment ID: O20031110000684

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. John William Frey 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
John William Frey, DO
200 1st St Sw,
Rochester, MN 55905-0001

Ph: (507) 284-2511
John William Frey, DO
700 West Ave South,
La Crosse, WI 54601-8806

Ph: (608) 785-0940

Reviews and Comments


Internal Medicine Doctors in La Crosse, WI

Mary K Frohnauer, MD
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Derek A Hupp,
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Madeline Rita Fasen, DO
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Phone: 608-785-0940    
Allen C. Foster, MD
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Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-782-7300    
Padmavathi Mali, M.D.
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Medicare: Accepting Medicare Assignments
Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-782-7300    
Emily Catherine Dolan, MD
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Medicare: Accepting Medicare Assignments
Practice Location: 1836 South Ave, La Crosse, WI 54601
Phone: 608-782-7300    
Adie D Harbin Iii, MD
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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.