Thomas Duncan, MD
NPI 1588641039 · Internal Medicine Physician · Neenah, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Duncan, MD is a Internal Medicine Physician provider in Neenah, WI (NPI 1588641039).
Provider details
- NPI number
- 1588641039
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 22196 (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
2,251 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 | 403 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 343 | $120 |
| Blood Test, Basic Group of Blood Chemicals (calcium, Total)80048 | 291 | $8 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 229 | $8 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 185 | $13 |
| Liver Function Blood Test Panel80076 | 157 | $8 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 139 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 479 | 125 |
| Amlodipine Besylate | 367 | 105 |
| Omeprazole | 337 | 91 |
| Lisinopril | 336 | 90 |
| Hydrochlorothiazide | 280 | 81 |
| Levothyroxine Sodium | 274 | 59 |
| Metoprolol Succinate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-27
- Last updated
- 2011-11-23
Frequently asked questions
- What is Thomas Duncan's NPI number?
- Thomas Duncan's National Provider Identifier (NPI) is 1588641039, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Duncan's specialty?
- Thomas Duncan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Duncan located?
- Thomas Duncan's practice location on file with NPPES is 200 Theda Clark Medical Plz Ste 240, Neenah, WI 54956-2790.
- What is Thomas Duncan's phone number?
- The practice phone number listed in the NPPES registry for Thomas Duncan is (920) 725-2070.
- Does Thomas Duncan accept Medicare?
- Thomas Duncan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Duncan's NPI active?
- Yes — Thomas Duncan's NPI (1588641039) is active in the NPPES registry as of the last update on 2011-11-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.