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Gary Gerstner, M.D.
NPI 1255392056 · Gastroenterology Physician · Waukesha, WI
Gary Gerstner, M.D. is a Gastroenterology Physician provider in Waukesha, WI (NPI 1255392056).
Provider details
- NPI number
- 1255392056
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 23767-020 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
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
1111 Delafield St
Suite 212
Waukesha, WI 53188-3417
Phone: (262) 544-8622
Fax: (262) 544-8630
Street-level locationGet directions
Mailing address
1111 Delafield St
Waukesha, WI 53188-3417
Registry dates
- Enumerated
- 2006-03-31
- Last updated
- 2014-08-12
Frequently asked questions
- What is Gary Gerstner's NPI number?
- Gary Gerstner's National Provider Identifier (NPI) is 1255392056, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gary Gerstner's specialty?
- Gary Gerstner is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Gary Gerstner located?
- Gary Gerstner's practice location on file with NPPES is 1111 Delafield St, Waukesha, WI 53188-3417.
- What is Gary Gerstner's phone number?
- The practice phone number listed in the NPPES registry for Gary Gerstner is (262) 544-8622.
- Is Gary Gerstner's NPI active?
- Yes — Gary Gerstner's NPI (1255392056) is active in the NPPES registry as of the last update on 2014-08-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.