Gehrig R. Williamson, MD
Family Medicine Physician · Appleton, WI
Gehrig R. Williamson, MD is a family medicine physician with a practice address in Appleton, Wisconsin, and NPI 1326157033, issued on Aug 29, 2006. Check the license (Wisconsin 49554, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Gehrig R. Williamson
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 49554 WI
Self-reported in NPPES; status is on the state search - Practice location
- 3916 N Intertech CT, Appleton, WI 54913
- Phone
- (920) 996-1046
- Enumerated
- Aug 29, 2006
- Record last updated
- Nov 1, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicaid ID
- 34894100 WI
- Medicare enrollment
- Enrolled (PECOS I20061026000529); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2005
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 3916 N Intertech CT
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Stephen Dernlan, MDInternal Medicine Physician1083646608
- Aaron Douglas, MDFamily Medicine Physician1346252442
Verify Gehrig R. Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 49554Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 78% of the cost of the top drugs
6,457 Medicare Part D claims for 823 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 28 claims were for opioids.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Atorvastatin Calcium464 claims
- Lisinopril333 claims
- Omeprazole212 claims
- Losartan Potassium203 claims
- Levothyroxine Sodium191 claims
- Shingrix184 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Primary Care Associates OF Appleton, LtdAppleton, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gehrig R. Williamson among 3,765 family medicine physician records in Wisconsin
Gehrig R. Williamson, MD is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2005 · median 2007 among the 2,347 with a school on file
- Record last updated2016 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
108 family medicine physician records list a practice address in Appleton
They are 108 of the 3,249 NPPES records with a practice address in Appleton, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Appleton → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Karen Beutler, MDAppleton, WI 549131215921127
- Dirk Derksen, MDAppleton, WI 549131013902055
- Robert Fox, MDAppleton, WI 549131144215773
- Stephen Fuller, MDAppleton, WI 549131003802638
- Lance Grammont, DOAppleton, WI 549131063459790
- Jonathan Hagen, MDAppleton, WI 549131316932379
- Jessica Johnston-Rickert, MDAppleton, WI 549131487691119
- Travis Kroner, M.D.Appleton, WI 549131184689341
Common questions
What is Gehrig R. Williamson, MD's NPI number?
Gehrig R. Williamson, MD's National Provider Identifier (NPI) is 1326157033, issued on Aug 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gehrig R. Williamson, MD located?
The NPPES record lists a practice address at 3916 N Intertech CT, Appleton, WI, 54913. Phone: (920) 996-1046. Providers update this record themselves, so call before visiting.
How can I verify Gehrig R. Williamson, MD's license?
NPPES lists Wisconsin license number 49554, 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.
How much does Gehrig R. Williamson, MD prescribe under Medicare Part D?
In 2024, Gehrig R. Williamson, MD had 6,457 Medicare Part D claims for 823 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.