Quick answers
- Does William F. Marsteller Iv accept Medicare assignment?
- Yes. Medicare's clinician data says William F. Marsteller Iv 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 William F. Marsteller Iv see?
- In 2024, CMS data shows 586 Original Medicare patients and 1,415 services for William F. Marsteller Iv. This counts Original Medicare only and measures volume, not quality.
- What is William F. Marsteller Iv's NPI number?
- 1992917504. 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 William F. Marsteller Iv, 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 | 586 |
|---|---|
| Services billed to Medicare | 1,415 |
| Different services or procedures | 48 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)272 services
- Biopsy of large bowel using a flexible endoscope (45380)206 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)190 services
- Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)186 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)143 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 pressure74%
- Arthritis49%
- Diabetes30%
- Anxiety26%
- Ischemic heart disease23%
Hospitals where William F. Marsteller Iv works
Medicare's Facility Affiliation Data lists William F. Marsteller Iv 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.
- Bon Secours-St Francis Xavier HospitalCharleston, SC · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 420065
- MUSC Medical CenterCharleston, SC · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 420004
- Roper HospitalCharleston, SC · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 420087
- Roper St Francis Hospital-Berkeley IncSummerville, SC · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 420110
- Trident Medical CenterCharleston, SC · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 420079
Practice locations
Addresses where William F. Marsteller Iv is enrolled with Medicare (CMS data updated October 2, 2026).
- 1962 Charlie Hall BlvdCharleston, SC 29414 (843) 722‑8000
- 328 Midland PkwySummerville, SC 29485 (843) 722‑8000
Group practices
Medicare enrollment lists William F. Marsteller Iv as a member of this group (CMS data updated October 2, 2026).
- Charleston Gastroenterology Specialists49 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Charleston
Clinicians with the same Medicare primary specialty in Charleston, SC — not a recommendation.
Other clinicians in Charleston Gastroenterology Specialists
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Ohio State University College Of Medicine |
| Graduation year | 2006 (20 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1992917504 |
| 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