William Ranum, MD
NPI 1043267172 · Family Medicine Physician · Waunakee, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Ranum, MD is a Family Medicine Physician provider in Waunakee, WI (NPI 1043267172).
Provider details
- NPI number
- 1043267172
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 29827-020 (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
1,504 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 | 412 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 241 | $121 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 151 | $122 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 101 | $85 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test85027 | 87 | $6 |
| Administration of Influenza Virus VaccineG0008 | 68 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 112 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 355 | 100 |
| Simvastatin | 228 | 61 |
| Omeprazole | 214 | 58 |
| Lisinopril | 203 | 60 |
| Levothyroxine Sodium | 171 | 42 |
| Hydrochlorothiazide | 146 | 46 |
| Amlodipine Besylate | 142 | 44 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-27
- Last updated
- 2021-06-10
- Certified
- 2021-06-10
Frequently asked questions
- What is William Ranum's NPI number?
- William Ranum's National Provider Identifier (NPI) is 1043267172, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ranum's specialty?
- William Ranum is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Ranum located?
- William Ranum's practice location on file with NPPES is 1300 S Century Ave, Waunakee, WI 53597-2386.
- What is William Ranum's phone number?
- The practice phone number listed in the NPPES registry for William Ranum is (608) 849-4315.
- Does William Ranum accept Medicare?
- William Ranum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Ranum's NPI active?
- Yes — William Ranum's NPI (1043267172) is active in the NPPES registry as of the last update on 2021-06-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.