Dr. Mark Williams, MD
1 Joslin Pl, Boston, MA 02215 • +1-399-555-2858
Medical Education: Accredited U.S. Medical School (Class of 2016)
What This Doctor Actually Performs: CMS Medicare Utilization & Boston Percentiles
NPI #1184653891 • CBSA 14460 • Nephrology
Anchored in Boston, MA 02215, Dr. Mark Williams, MD (NPI 1184653891) logged 943 annual procedures (mid-cohort balanced caseload (44.64th Boston percentile), 21.74th MA percentile, -0.38σ) with sub-specialty concentration in 23 Active CMS HCPCS Codes.
Granular CPT/HCPCS billing distribution at 1 Joslin Pl shows Dr. Mark Williams's primary concentration in Chronic Kidney Disease eGFR, uACR & Electrolyte Management (code 99214: 453x/yr, 44.64th local percentile) alongside Monthly Adult ESRD Renal Replacement Oversight (90960: 207x/yr, $491–$673).
Direct cash-pay transparency modeling sets Dr. Williams's baseline new-consult rate near $227.00 in Boston, MA (cash-pay accepted, in-person clinic visits only, 13-minute average reception wait).
From 1 Joslin Pl in Boston (+1-399-555-2858), Dr. Williams, MD (10-year clinical track record) delivers 23 Active CMS HCPCS Codes care.
Compared against Boston, MA Nephrology peers
943 annual services across 244 beneficiaries
Standard deviations from MA Nephrology mean utilization
Top Billed HCPCS/CPT Procedures & GPCI Self-Pay Cash Benchmarks
| HCPCS | Clinical Procedure Description | Annual Volume | Local Pct | Est. Cash Range |
|---|---|---|---|---|
| 99214 | Chronic Kidney Disease eGFR, uACR & Electrolyte Management | 453 | 44.64th | $246 – $337 |
| 90960 | Monthly Adult ESRD Renal Replacement Oversight | 207 | 47.64th | $491 – $673 |
| 99215 | High-Complexity Cardiorenal & Resistant Hypertension Visit | 170 | 41.64th | $358 – $491 |
| 99204 | New Patient Nephrology & Proteinuria Consultation | 113 | 41.64th | $338 – $463 |
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Dr. Mark Williams, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Williams National Provider Identifier | NPI #1184653891 (MD) | CMS NPPES Registry (02215) |
| Dr. Williams Boston CMS Volume Rank | 44.64th Pct (943 CMS svcs; Z -0.384σ) | CMS Medicare Part B (MA Nephrology) |
| Fair Cash-Pay New-Patient Benchmark | $227.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Boston, MA) |
| Waiting-Room Wait Time & Cash Friendliness | $227.00 avg paid • 13 min lobby wait | 3 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.73/5 Listening • 4.86/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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