Quick answers
- Does Carlos A. Nieves accept Medicare assignment?
- Yes. Medicare's clinician data says Carlos A. Nieves 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 Carlos A. Nieves see?
- In 2024, CMS data shows 192 Original Medicare patients and 729 services for Carlos A. Nieves. This counts Original Medicare only and measures volume, not quality.
- What is Carlos A. Nieves's NPI number?
- 1821779067. 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 Carlos A. Nieves, 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 | 192 |
|---|---|
| Services billed to Medicare | 729 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Destruction of precancer skin growth, 2-14 growths (17003)281 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)130 services
- Biopsy of related skin growth, first growth (11102)95 services
- Destruction of precancer skin growth, 1 growth (17000)78 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)60 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 cholesterol75%
- High blood pressure69%
- Arthritis42%
- Diabetes30%
- Anxiety25%
- Chronic kidney disease24%
Hospitals where Carlos A. Nieves works
Medicare's Facility Affiliation Data lists Carlos A. Nieves 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.
- St Marys Hospital Medical CenterGreen Bay, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520097
Practice locations
Addresses where Carlos A. Nieves is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 1526 N Taylor DrSheboygan, WI 53081 (920) 457‑2100
- 1606 S Stephenson AveIron Mountain, MI 49801 (920) 965‑0345
- 2360 Duck Creek PkwyGreen Bay, WI 54303 (920) 965‑0345
- 2500 E Capital DrAppleton, WI 54911 (920) 569‑6549
- 3059 Voyager DrGreen Bay, WI 54311 (920) 965‑0345
Group practices
Medicare enrollment lists Carlos A. Nieves as a member of these groups (CMS data updated October 2, 2026).
- St Vincent Hospital-Hospital Sisters-Third Order of St Francis603 clinicians in the group
- St Nicholas Hospital-Sisters of the Third Order of St Francis178 clinicians in the group
- New Dermatology Group Ltd23 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Sheboygan
Clinicians with the same Medicare primary specialty in Sheboygan, WI — not a recommendation.
Other clinicians in St Vincent Hospital-Hospital Sisters-Third Order of St Francis
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2023 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821779067 |
| 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