Dr. Marc Greenstadt, MD
18350 Roscoe Blvd, Suite 300, Northridge, CA 91325 • +1-837-555-2875
Medical Education: Accredited U.S. Medical School (Class of 2015)
What This Doctor Actually Performs: CMS Medicare Utilization & Northridge Percentiles
NPI #1861424418 • CBSA Regional • Internal Medicine
Anchored in Northridge, CA 91325, Dr. Marc Greenstadt, MD (NPI 1861424418) logged 1,300 annual procedures (focused low-volume boutique caseload (31.82th Northridge percentile), 43.24th CA percentile, -0.09σ) with sub-specialty concentration in 18 Active CMS HCPCS Codes.
Procedural volume for Dr. Greenstadt is led by HCPCS 99214 (Moderate-to-High Complexity Internal Medicine Follow-Up — 585 annual services, $115–$158 GPCI cash estimate), followed by CPT 99213 (Established Preventive & Chronic Care Visit, 338/yr) and CPT 93000 (In-Office 12-Lead Resting Electrocardiogram, 169/yr).
Direct cash-pay transparency modeling sets Dr. Greenstadt's baseline new-consult rate near $239.00 in Northridge, CA (cash-pay accepted, hybrid in-clinic and telehealth video consults, 22-minute average reception wait).
NPI registry verification (#1861424418) confirms Dr. Marc Greenstadt's MD standing serving CBSA 91325 with a 4.85/5 patient scorecard.
Compared against Northridge, CA Internal Medicine peers
1,300 annual services across 352 beneficiaries
Standard deviations from CA 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 | 585 | 31.82th | $115 – $158 |
| 99213 | Established Preventive & Chronic Care Visit | 338 | 29.82th | $88 – $121 |
| 93000 | In-Office 12-Lead Resting Electrocardiogram | 169 | 36.82th | $42 – $58 |
| G0439 | Annual Preventive Wellness & Cardiometabolic Risk Assessment | 130 | 29.82th | $135 – $185 |
| 99204 | Comprehensive New Patient Internal Medicine Diagnostic Visit | 78 | 28.82th | $160 – $219 |
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Dr. Marc Greenstadt, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Greenstadt National Provider Identifier | NPI #1861424418 (MD) | CMS NPPES Registry (91325) |
| Dr. Greenstadt Northridge CMS Volume Rank | 31.82th Pct (1,300 CMS svcs; Z -0.090σ) | CMS Medicare Part B (CA Internal Medicine) |
| Fair Cash-Pay New-Patient Benchmark | $239.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Northridge, CA) |
| Waiting-Room Wait Time & Cash Friendliness | $239.00 avg paid • 22 min lobby wait | 20 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.81/5 Listening • 4.59/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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