Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John William Frey, DO

Individual provider Pulmonary Disease Physician · NPI 1538600754

John William Frey, DO is registered under Pulmonary Disease in LA Crosse, Wisconsin. Qualified in 2017, 9 years ago. Practices with Mayo Clinic Health System-Southwest Wisconsin Region Inc, a 552-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Kansas and Wisconsin.

Years since qualifying
9
Licensed in
KS, WI
In the registry since
2017
Specialties on file
4
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

700 W Ave S
LA Crosse, WI 54601-8806
Phone: (608) 785-0940
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 3901 Rainbow Blvd, Kansas City, KS 66160-8500 — (608) 558-2996

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence 81144 (WI)
Pulmonary Disease Physician Taxonomy 207RP1001X · Licence 94-09289 (KS)
Internal Medicine Physician Taxonomy 207R00000X · Licence 94-09289 (KS)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence 81144 (WI)

Record details

NPI number1538600754
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 20, 2017
Last updated in NPPESSeptember 8, 2023
Certification dateSeptember 8, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPULMONARY DISEASE
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Mayo Clinic Health System-Southwest Wisconsin Region Inc — 552 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients396
Services billed 948 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Mayo Clinic Health System-Franciscan Medical Center Inc Hospital · La Crosse, WI · listed as Mayo Clinic Health System-Southwest Wisconsin Region, Inc
  • Mayo Clinic Hospital Rochester Hospital · Rochester, MN · listed as Mayo Clinic Hospital-Rochester
  • Crossing Rivers Health Medical Center Hospital · Prairie Du Chien, WI
  • Mayo Clinic Hlth Systm Franciscan Hlthcare Sparta Hospital · Sparta, WI
  • Winnmed Hospital · Decorah, IA

Colleagues at Mayo Clinic Health System-Southwest Wisconsin Region Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 552 clinicians in the practice; 12 are shown here.

Other providers in LA Crosse