Quick answers
- Does Thomas K. Duncan accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas K. Duncan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Thomas K. Duncan see?
- In 2024, CMS data shows 223 Original Medicare patients and 2,515 services for Thomas K. Duncan. This counts Original Medicare only and measures volume, not quality.
- What is Thomas K. Duncan's NPI number?
- 1588641039. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Thomas K. Duncan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 223 |
|---|---|
| Services billed to Medicare | 2,515 |
| Different services or procedures | 66 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)403 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)343 services
- Blood test, basic group of blood chemicals (calcium, total) (80048)291 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)229 services
- Blood test, lipids (cholesterol and triglycerides) (80061)185 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis47%
- Diabetes35%
- Chronic kidney disease35%
- Ischemic heart disease30%
Hospitals where Thomas K. Duncan works
Medicare's Facility Affiliation Data lists Thomas K. Duncan at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Thedacare Medical Center-WaupacaWaupaca, WI · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 521334
- Thedacare Regional Medical Center - Appleton IncAppleton, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520160
- Thedacare Regional Medical Center - NeenahNeenah, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520045
Practice locations
Addresses where Thomas K. Duncan is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 9; the Medicare profile lists all.
- 1265 W American Dr, Suite 100Neenah, WI 54956 (920) 886‑8979
- 1405 Mill StNew London, WI 54961
- 1405 S Mill StNew London, WI 54961 (920) 831‑5050
- 2500 E Capital DrAppleton, WI 54911
- 3 Neenah CtrNeenah, WI 54956
Group practices
Medicare enrollment lists Thomas K. Duncan as a member of this group (CMS data updated October 2, 2026).
- Thedacare, Incorporated647 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Neenah
Clinicians with the same Medicare primary specialty in Neenah, WI — not a recommendation.
Other clinicians in Thedacare, Incorporated
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 1975 (51 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1588641039 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians