Karl Larson, M.D.
NPI 1063528529 · Family Medicine Physician · Oshkosh, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karl Larson, M.D. is a Family Medicine Physician provider in Oshkosh, WI (NPI 1063528529).
Provider details
- NPI number
- 1063528529
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 28253 (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
19 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 92 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 237 | 76 |
| Losartan Potassium | 218 | 65 |
| Amlodipine Besylate | 214 | 70 |
| Rosuvastatin Calcium | 167 | 44 |
| Lisinopril | 162 | 51 |
| Metoprolol Succinate | 151 | 49 |
| Levothyroxine Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-21
- Last updated
- 2009-12-17
Frequently asked questions
- What is Karl Larson's NPI number?
- Karl Larson's National Provider Identifier (NPI) is 1063528529, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karl Larson's specialty?
- Karl Larson is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karl Larson located?
- Karl Larson's practice location on file with NPPES is 2725 Jackson St, Oshkosh, WI 54901-1513.
- What is Karl Larson's phone number?
- The practice phone number listed in the NPPES registry for Karl Larson is (920) 223-7500.
- Does Karl Larson accept Medicare?
- Karl Larson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karl Larson's NPI active?
- Yes — Karl Larson's NPI (1063528529) is active in the NPPES registry as of the last update on 2009-12-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.