Dr. Elmer Chang, MD
27871 Medical Center Rd, Suite 200, Mission Viejo, CA 92691 • +1-852-555-9947
Medical Education: Accredited U.S. Medical School (Class of 1996)
What This Doctor Actually Performs: CMS Medicare Utilization & Mission Viejo Percentiles
NPI #1912083353 • CBSA Regional • Gastroenterology
Operating out of Mission Viejo, CA (27871 Medical Center Rd, Suite 200), Gastroenterology clinician Dr. Elmer Chang, MD (accredited MD/DO training, 1996) maintains a upper-quartile active clinical volume (69.23th Mission Viejo percentile) (56.96th CA percentile; Z-score -0.18σ across 1,341 documented services) with sub-specialty concentration in 47 Active CMS HCPCS Codes.
Medicare Part B line-item claims for Dr. Elmer Chang (92691) place 99214 at the top of the practice ledger (496 yearly units, 69.23th metro rank), rounded out by 45380 and 43239.
Self-pay new patient consultations with Dr. Chang (CPT 99204 GPCI-adjusted benchmark) estimate around $239.00 (community reported average: $239.00) with hybrid in-clinic and telehealth video consults, 22-minute average reception wait, and a 4.91/5 modern protocol openness score across 10 patient logs.
Spanning 30 years of clinical practice following 1996 graduation from medical training, Dr. Elmer Chang integrates 47 Active CMS HCPCS Codes diagnostics for Mission Viejo metro patients.
Compared against Mission Viejo, CA Gastroenterology peers
1,341 annual services across 434 beneficiaries
Standard deviations from CA 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 | 496 | 69.23th | $199 – $273 |
| 45380 | Diagnostic Colonoscopy w/ Mucosal Tissue Biopsy | 335 | 66.23th | $480 – $657 |
| 43239 | Upper GI Esophagogastroduodenoscopy (EGD) w/ Biopsy | 282 | 68.23th | $398 – $546 |
| 45385 | Colonoscopy w/ Snare Polypectomy Lesion Removal | 134 | 65.23th | $534 – $732 |
| 99204 | New Patient Digestive & Hepatology Consultation | 94 | 72.23th | $281 – $384 |
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Dr. Elmer Chang, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Chang National Provider Identifier | NPI #1912083353 (MD) | CMS NPPES Registry (92691) |
| Dr. Chang Mission Viejo CMS Volume Rank | 69.23th Pct (1,341 CMS svcs; Z -0.183σ) | CMS Medicare Part B (CA Gastroenterology) |
| Fair Cash-Pay New-Patient Benchmark | $239.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Mission Viejo, CA) |
| Waiting-Room Wait Time & Cash Friendliness | $239.00 avg paid • 22 min lobby wait | 10 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.82/5 Listening • 4.91/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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