Quick answers
- Does John M. Humeniuk accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Humeniuk 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 John M. Humeniuk see?
- In 2024, CMS data shows 1,696 Original Medicare patients and 14,182 services for John M. Humeniuk. This counts Original Medicare only and measures volume, not quality.
- What is John M. Humeniuk's NPI number?
- 1639164528. 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 John M. Humeniuk, 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 | 1,696 |
|---|---|
| Services billed to Medicare | 14,182 |
| Different services or procedures | 77 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Destruction of precancer skin growth, 2-14 growths (17003)5,576 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)2,738 services
- Destruction of precancer skin growth, 15 or more growths (17004)2,181 services
- Destruction of skin growth, 1-14 growths (17110)1,333 services
- Destruction of precancer skin growth, 1 growth (17000)595 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 pressure72%
- Arthritis45%
- Ischemic heart disease25%
- Diabetes24%
- Chronic kidney disease23%
Hospitals where John M. Humeniuk works
Medicare's Facility Affiliation Data lists John M. Humeniuk 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.
- Prisma Health Greer Memorial HospitalGreer, SC · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 420033
- St Francis-DowntownGreenville, SC · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 420023
Practice locations
Addresses where John M. Humeniuk is enrolled with Medicare (CMS data updated October 2, 2026).
- 21 Memorial Medical DrGreenville, SC 29605 (864) 295‑9085
Specialties
- Dermatologyprimary
Other dermatologists in Greenville
Clinicians with the same Medicare primary specialty in Greenville, SC — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1977 (49 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639164528 |
| 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