Gary Lee Gerstner, M.D.
Gastroenterology Physician · Waukesha, WI
Gary Lee Gerstner, M.D. is a gastroenterology physician with a practice address in Waukesha, Wisconsin, and NPI 1255392056, issued on Mar 31, 2006. Check the license (Wisconsin 23767-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Gary Lee Gerstner
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 23767-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1111 Delafield St, Waukesha, WI 53188
- Phone
- (262) 544-8622
- Enumerated
- Mar 31, 2006
- Record last updated
- Aug 12, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (262) 544-8630
- Medicaid ID
- 30522700 WI
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 340 in Wisconsin → Look up another NPI →
Also registered at 1111 Delafield St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gary Lee Gerstner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 23767-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 82.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Gary Lee Gerstner among 340 gastroenterology physician records in Wisconsin
Gary Lee Gerstner, M.D. is one of 340 gastroenterology physician records with a practice address in Wisconsin. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 44% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2014 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Wisconsin
There are 340 gastroenterology physician records in Wisconsin.
All 340 in Wisconsin → Every provider in Waukesha → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Mark Dreyer, M.D.Waukesha, WI 531881396714861
- David Rogers, MDWaukesha, WI 531881952375685
- Vincents Dindzans, M.D.Milwaukee, WI 532021437106606
- Sunil Kapur, M.D.Milwaukee, WI 532091235168048
- Vasanth Siddalingaiah, M.D.Milwaukee, WI 532091447280326
- Yuchen WangMilwaukee, WI 532091285018549
- Thomas Slota, MDMilwaukee, WI 532101578521647
- Maurice Chung, M.D.Milwaukee, WI 532111124042015
Common questions
What is Gary Lee Gerstner, M.D.'s NPI number?
Gary Lee Gerstner, M.D.'s National Provider Identifier (NPI) is 1255392056, issued on Mar 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary Lee Gerstner, M.D. located?
The NPPES record lists a practice address at 1111 Delafield St, Waukesha, WI, 53188. Phone: (262) 544-8622. Providers update this record themselves, so call before visiting.
How can I verify Gary Lee Gerstner, M.D.'s license?
NPPES lists Wisconsin license number 23767-020, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Gary Lee Gerstner, M.D.'s MIPS final score?
The 2023 MIPS final score is 82.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.