Dr. John Williamson, MD
316 Calhoun St, Charleston, SC 29401 • +1-903-555-9536
Medical Education: Accredited U.S. Medical School (Class of 1995)
What This Doctor Actually Performs: CMS Medicare Utilization & Charleston Percentiles
NPI #1043308661 • CBSA Regional • Family Practice
Dr. John Williamson, MD (NPI #1043308661) practices Family Practice in Charleston, SC (29401) with sub-specialty concentration in 12 Active CMS HCPCS Codes, recording 809 annual CMS services across 316 distinct beneficiaries—placing this practice as a focused low-volume boutique caseload (9.38th Charleston percentile) (-0.25σ vs SC state mean, 8.83th statewide percentile).
Procedural volume for Dr. Williamson is led by HCPCS 99214 (Comprehensive Primary Care & Chronic Protocol Management — 340 annual services, $149–$205 GPCI cash estimate), followed by CPT 99213 (Focused Acute & Preventive Primary Care Evaluation, 251/yr) and CPT G0439 (Annual Wellness Biomarker & Preventive Screening Visit, 97/yr).
For out-of-network patients contacting +1-903-555-9536, Dr. Williamson's practice posts a $209.00 GPCI self-pay consult estimate ($209.00 patient-logged median, 4.71/5 composite reality score over 6 submissions).
Credentialed as an MD specialist with 31 years post-graduation experience since completing medical school at an LCME/COCA institution (1995), Dr. Williamson coordinates 12 Active CMS HCPCS Codes workups from 316 Calhoun St (+1-903-555-9536).
Compared against Charleston, SC Family Practice peers
809 annual services across 316 beneficiaries
Standard deviations from SC Family Practice mean utilization
Top Billed HCPCS/CPT Procedures & GPCI Self-Pay Cash Benchmarks
| HCPCS | Clinical Procedure Description | Annual Volume | Local Pct | Est. Cash Range |
|---|---|---|---|---|
| 99214 | Comprehensive Primary Care & Chronic Protocol Management | 340 | 12th | $149 – $205 |
| 99213 | Focused Acute & Preventive Primary Care Evaluation | 251 | 12th | $114 – $157 |
| G0439 | Annual Wellness Biomarker & Preventive Screening Visit | 97 | 12th | $172 – $235 |
| 36415 | Routine Venipuncture Blood Biomarker Collection | 73 | 12th | $32 – $47 |
| 99204 | New Patient Primary Care Intake & Diagnostic Plan | 49 | 12th | $205 – $281 |
Are you Dr. John Williamson? Embed your Official DotMD Verification Badge (0-JS SVG)
Paste this lightweight SVG snippet onto your clinic bio page in Charleston, SC:
<a href="https://dotmd.com/doctors/john-williamson-md-charleston-sc-1043308661" title="Dr. John Williamson, MD - Verified CMS Utilization on DotMD"><img src="https://dotmd.com/badges/npi/1043308661.svg" alt="Dr. John Williamson Family Practice Badge" width="280" height="72" /></a>
Dr. John Williamson, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Williamson National Provider Identifier | NPI #1043308661 (MD) | CMS NPPES Registry (29401) |
| Dr. Williamson Charleston CMS Volume Rank | 9.38th Pct (809 CMS svcs; Z -0.254σ) | CMS Medicare Part B (SC Family Practice) |
| 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 • 16 min lobby wait | 6 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.73/5 Listening • 4.84/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
Ask our AI Specialists anything about Dr. John Williamson
Other High-Volume Family Practice Specialists in Charleston, SC
Ranked strictly by CMS Medicare volumeDr. Williamson Waiting-Room Q&A & Patient Experience Logs
Anonymous patient-submitted wait times, cash visit fees, and bedside manner discussions in Charleston, SC.
Share your self-pay visit cost and lobby wait time—no account, email, or IP stored.
Filter Dr. John Williamson community threads and patient logs by age, biological sex, dosage, and treatment duration.