Dr. William Marsteller, MD
1962 Charlie Hall Blvd., Charleston, SC 29414 • +1-566-555-7663
Medical Education: Accredited U.S. Medical School (Class of 2001)
What This Doctor Actually Performs: CMS Medicare Utilization & Charleston Percentiles
NPI #1992917504 • CBSA Regional • Gastroenterology
CMS Medicare Part B utilization records credit Dr. William Marsteller (MD, NPI 1992917504) at 1962 Charlie Hall Blvd. in Charleston with 1,415 annual clinical services (586 beneficiaries), corresponding to a -0.32σ regional deviation and upper-quartile active clinical volume (72th Charleston percentile) with sub-specialty concentration in 48 Active CMS HCPCS Codes.
Granular CPT/HCPCS billing distribution at 1962 Charlie Hall Blvd. shows Dr. William Marsteller's primary concentration in Established Gastroenterology, GERD & IBD Evaluation (code 99214: 524x/yr, 72th local percentile) alongside Diagnostic Colonoscopy w/ Mucosal Tissue Biopsy (45380: 354x/yr, $447–$613).
Self-pay new patient consultations with Dr. Marsteller (CPT 99204 GPCI-adjusted benchmark) estimate around $209.00 (community reported average: $209.00) with in-person clinic visits only, 10-minute average reception wait, and a 4.58/5 modern protocol openness score across 6 patient logs.
Patients evaluating Dr. William Marsteller in ZIP 29414 note 25 years of post-doctoral tenure (null, 2001) alongside 2.4 annual CMS procedures per patient.
Compared against Charleston, SC Gastroenterology peers
1,415 annual services across 586 beneficiaries
Standard deviations from SC Gastroenterology mean utilization
Top Billed HCPCS/CPT Procedures & GPCI Self-Pay Cash Benchmarks
| HCPCS | Clinical Procedure Description | Annual Volume | Local Pct | Est. Cash Range |
|---|---|---|---|---|
| 99214 | Established Gastroenterology, GERD & IBD Evaluation | 524 | 72th | $186 – $255 |
| 45380 | Diagnostic Colonoscopy w/ Mucosal Tissue Biopsy | 354 | 77th | $447 – $613 |
| 43239 | Upper GI Esophagogastroduodenoscopy (EGD) w/ Biopsy | 297 | 68th | $371 – $509 |
| 45385 | Colonoscopy w/ Snare Polypectomy Lesion Removal | 142 | 76th | $498 – $683 |
| 99204 | New Patient Digestive & Hepatology Consultation | 99 | 69th | $262 – $359 |
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Dr. William Marsteller, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Marsteller National Provider Identifier | NPI #1992917504 (MD) | CMS NPPES Registry (29414) |
| Dr. Marsteller Charleston CMS Volume Rank | 72.00th Pct (1,415 CMS svcs; Z -0.323σ) | CMS Medicare Part B (SC Gastroenterology) |
| Fair Cash-Pay New-Patient Benchmark | $209.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Charleston, SC) |
| Waiting-Room Wait Time & Cash Friendliness | $209.00 avg paid • 10 min lobby wait | 6 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.88/5 Listening • 4.58/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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