John Gassner, MD
NPI 1588600696 · Diagnostic Radiology Physician · Green Bay, WI
John Gassner, MD is a Diagnostic Radiology Physician provider in Green Bay, WI (NPI 1588600696).
Provider details
- NPI number
- 1588600696
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 28941020 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-20
- Last updated
- 2009-10-08
Frequently asked questions
- What is John Gassner's NPI number?
- John Gassner's National Provider Identifier (NPI) is 1588600696, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Gassner's specialty?
- John Gassner is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Gassner located?
- John Gassner's practice location on file with NPPES is 1789 Shawano Ave, Green Bay, WI 54303.
- What is John Gassner's phone number?
- The practice phone number listed in the NPPES registry for John Gassner is (920) 499-1428.
- Is John Gassner's NPI active?
- Yes — John Gassner's NPI (1588600696) is active in the NPPES registry as of the last update on 2009-10-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.