William Winkelmeyer, M.D.
NPI 1316943475 · Nephrology Physician · Columbia, MO
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Winkelmeyer, M.D. is a Nephrology Physician provider in Columbia, MO (NPI 1316943475).
Provider details
- NPI number
- 1316943475
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 36326 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,243 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 532 | $15 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 382 | $165 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 358 | $74 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 310 | $117 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 151 | $328 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 100 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Torsemide | 919 | 224 |
| Amlodipine Besylate | 600 | 155 |
| Losartan Potassium | 473 | 120 |
| Atorvastatin Calcium | 462 | 120 |
| Lisinopril | 354 | 97 |
| Indapamide | 244 | 65 |
| Allopurinol | 239 | 59 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$23 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-06-23
- Last updated
- 2022-10-05
- Certified
- 2022-10-05
Frequently asked questions
- What is William Winkelmeyer's NPI number?
- William Winkelmeyer's National Provider Identifier (NPI) is 1316943475, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Winkelmeyer's specialty?
- William Winkelmeyer is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is William Winkelmeyer located?
- William Winkelmeyer's practice location on file with NPPES is 1205 W Broadway, Columbia, MO 65203-2125.
- What is William Winkelmeyer's phone number?
- The practice phone number listed in the NPPES registry for William Winkelmeyer is (573) 499-0642.
- Does William Winkelmeyer accept Medicare?
- William Winkelmeyer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Winkelmeyer's NPI active?
- Yes — William Winkelmeyer's NPI (1316943475) is active in the NPPES registry as of the last update on 2022-10-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.