Dr. Kellyn Marks, MD
201 E Huron St, 12th Fl Suite 105, Chicago, IL 60611 • +1-630-555-3980
Medical Education: Accredited U.S. Medical School (Class of 1992)
What This Doctor Actually Performs: CMS Medicare Utilization & Chicago Percentiles
NPI #1215973599 • CBSA 16980 • Internal Medicine
Operating out of Chicago, IL (201 E Huron St, 12th Fl Suite 105), Internal Medicine clinician Dr. Kellyn Marks, MD (accredited MD/DO training, 1992) maintains a mid-cohort balanced caseload (64.16th Chicago percentile) (50.98th IL percentile; Z-score -0.17σ across 1,399 documented services) with sub-specialty concentration in 25 Active CMS HCPCS Codes.
Among 6 tracked CMS fee-schedule codes for Dr. Marks (averaging 4.3 services per beneficiary), 99214 (Moderate-to-High Complexity Internal Medicine Follow-Up) represents 41% of tracked volume (572 encounters), paired with 99213 (330x).
For out-of-network patients contacting +1-630-555-3980, Dr. Marks's practice posts a $222.00 GPCI self-pay consult estimate ($222.00 patient-logged median, 4.81/5 composite reality score over 12 submissions).
NPI registry verification (#1215973599) confirms Dr. Kellyn Marks's MD standing serving CBSA 16980 with a 4.81/5 patient scorecard.
Compared against Chicago, IL Internal Medicine peers
1,399 annual services across 323 beneficiaries
Standard deviations from IL Internal Medicine mean utilization
Top Billed HCPCS/CPT Procedures & GPCI Self-Pay Cash Benchmarks
| HCPCS | Clinical Procedure Description | Annual Volume | Local Pct | Est. Cash Range |
|---|---|---|---|---|
| 99214 | Moderate-to-High Complexity Internal Medicine Follow-Up | 572 | 64.16th | $169 – $232 |
| 99213 | Established Preventive & Chronic Care Visit | 330 | 63.16th | $129 – $177 |
| 93000 | In-Office 12-Lead Resting Electrocardiogram | 165 | 64.16th | $62 – $85 |
| G0439 | Annual Preventive Wellness & Cardiometabolic Risk Assessment | 127 | 69.16th | $199 – $272 |
| 99204 | Comprehensive New Patient Internal Medicine Diagnostic Visit | 76 | 62.16th | $235 – $323 |
| 96372 | Therapeutic Subcutaneous/Intramuscular Injection Administration (25 HCPCS billing breadth) | 129 | 64.16th | $153 – $222 |
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Dr. Kellyn Marks, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Marks National Provider Identifier | NPI #1215973599 (MD) | CMS NPPES Registry (60611) |
| Dr. Marks Chicago CMS Volume Rank | 64.16th Pct (1,399 CMS svcs; Z -0.165σ) | CMS Medicare Part B (IL Internal Medicine) |
| Fair Cash-Pay New-Patient Benchmark | $222.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Chicago, IL) |
| Waiting-Room Wait Time & Cash Friendliness | $222.00 avg paid • 20 min lobby wait | 12 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.65/5 Listening • 4.83/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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