William Cooper, MD
NPI 1023078037 · Internal Medicine Physician · Oconomowoc, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Cooper, MD is a Internal Medicine Physician provider in Oconomowoc, WI (NPI 1023078037).
Provider details
- NPI number
- 1023078037
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 49183 (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
20 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
1,906 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 462 | $119 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 422 | $11 |
| Blood Test, Clotting Time85610 | 301 | $4 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 165 | $122 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 108 | $101 |
| Residence Visit for Established Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99349 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 157 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 1,007 | 225 |
| Losartan Potassium | 709 | 167 |
| Levothyroxine Sodium | 527 | 111 |
| Amlodipine Besylate | 487 | 121 |
| Pantoprazole Sodium | 385 | 86 |
| Apixabanbrand: Eliquis | 368 | 55 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-24
- Last updated
- 2012-04-16
Frequently asked questions
- What is William Cooper's NPI number?
- William Cooper's National Provider Identifier (NPI) is 1023078037, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Cooper's specialty?
- William Cooper is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Cooper located?
- William Cooper's practice location on file with NPPES is 1185 Corporate Center Dr Ste 175, Oconomowoc, WI 53066-4889.
- What is William Cooper's phone number?
- The practice phone number listed in the NPPES registry for William Cooper is (262) 928-8400.
- Does William Cooper accept Medicare?
- William Cooper is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Cooper's NPI active?
- Yes — William Cooper's NPI (1023078037) is active in the NPPES registry as of the last update on 2012-04-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.