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John William Frey, DO

Pulmonary Disease Physician in La Crosse, WI · enumerated 2017.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1538600754

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Registry record

Entity type Individual (Type 1)
Name John William Frey
Credential DO
Sex Male
Practice address 700 West Ave South, La Crosse, WI, 54601
Phone (608) 785-0940
Enumeration date Mar 20, 2017
Last updated in NPPES Sep 8, 2023

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 94-09289 (KS) Secondary
207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 81144 (WI) Primary
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 94-09289 (KS) Secondary
207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 81144 (WI) Secondary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How do I verify John Frey's NPI record?
Cross-check NPI 1538600754 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1538600754 active?
Yes, as of the latest NPPES snapshot, NPI 1538600754 is active (record last updated 2023-09-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-09-08.