Gehrig Williamson, MD
NPI 1326157033 · Family Medicine Physician · Appleton, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gehrig Williamson, MD is a Family Medicine Physician provider in Appleton, WI (NPI 1326157033).
Provider details
- NPI number
- 1326157033
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 49554 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,236 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 223 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 149 | $120 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 108 | $85 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 102 | $13 |
| Hemoglobin A1c Level83036 | 92 | $10 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 89 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 102 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 464 | 132 |
| Lisinopril | 333 | 88 |
| Omeprazole | 212 | 59 |
| Losartan Potassium | 203 | 58 |
| Levothyroxine Sodium | 191 | 49 |
| Varicella-Zoster Ge/As01b/Pfbrand: Shingrix | 184 | 144 |
| Rsvpref3 Antigen/As01e/Pf |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-29
- Last updated
- 2016-11-01
Frequently asked questions
- What is Gehrig Williamson's NPI number?
- Gehrig Williamson's National Provider Identifier (NPI) is 1326157033, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gehrig Williamson's specialty?
- Gehrig Williamson is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gehrig Williamson located?
- Gehrig Williamson's practice location on file with NPPES is 3916 N Intertech Ct, Appleton, WI 54913-6957.
- What is Gehrig Williamson's phone number?
- The practice phone number listed in the NPPES registry for Gehrig Williamson is (920) 996-1046.
- Does Gehrig Williamson accept Medicare?
- Gehrig Williamson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gehrig Williamson's NPI active?
- Yes — Gehrig Williamson's NPI (1326157033) is active in the NPPES registry as of the last update on 2016-11-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.