Dr. William Rietkerk, MD
55 Rolling Oaks DR Ste 200, Thousand Oaks, CA 91361 • +1-363-555-7393
Medical Education: Accredited U.S. Medical School (Class of 2007)
What This Doctor Actually Performs: CMS Medicare Utilization & Thousand Oaks Percentiles
NPI #1720311400 • CBSA Regional • Dermatology
CMS Medicare Part B utilization records credit Dr. William Rietkerk (MD, NPI 1720311400) at 55 Rolling Oaks DR Ste 200 in Thousand Oaks with 15,771 annual clinical services (1,681 beneficiaries), corresponding to a +0.56σ regional deviation and upper-quartile active clinical volume (83.33th Thousand Oaks percentile) with sub-specialty concentration in 58 Active CMS HCPCS Codes.
Fee-schedule auditing of NPI 1720311400 highlights 5322 annual claims for 17000 (83.33th Thousand Oaks percentile; $80–$110 self-pay corridor) plus 4853 encounters under 99213 and 2974 under 11102.
Direct cash-pay transparency modeling sets Dr. Rietkerk's baseline new-consult rate near $239.00 in Thousand Oaks, CA (cash-pay accepted, in-person clinic visits only, 19-minute average reception wait).
Patients evaluating Dr. William Rietkerk in ZIP 91361 note 19 years of post-doctoral tenure (null, 2007) alongside 9.4 annual CMS procedures per patient.
Compared against Thousand Oaks, CA Dermatology peers
15,771 annual services across 1,681 beneficiaries
Standard deviations from CA Dermatology mean utilization
Top Billed HCPCS/CPT Procedures & GPCI Self-Pay Cash Benchmarks
| HCPCS | Clinical Procedure Description | Annual Volume | Local Pct | Est. Cash Range |
|---|---|---|---|---|
| 17000 | Cryotherapy Destruction of Premalignant Actinic Lesion | 5,322 | 83.33th | $80 – $110 |
| 99213 | Focused Cutaneous & Dermoscopic Examination | 4,853 | 86.33th | $90 – $123 |
| 11102 | Tangential Diagnostic Skin Biopsy of Single Lesion | 2,974 | 87.33th | $118 – $162 |
| 11401 | Excision of Benign Cutaneous Lesion (0.6 to 1.0 cm) | 1,565 | 86.33th | $165 – $226 |
| 99203 | New Patient Full-Body Skin Cancer & Dermatology Evaluation | 939 | 85.33th | $127 – $175 |
| 96372 | Therapeutic Subcutaneous/Intramuscular Injection Administration (58 HCPCS billing breadth) | 117 | 83.33th | $98 – $142 |
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Dr. William Rietkerk, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Rietkerk National Provider Identifier | NPI #1720311400 (MD) | CMS NPPES Registry (91361) |
| Dr. Rietkerk Thousand Oaks CMS Volume Rank | 83.33th Pct (15,771 CMS svcs; Z +0.562σ) | CMS Medicare Part B (CA Dermatology) |
| Fair Cash-Pay New-Patient Benchmark | $239.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Thousand Oaks, CA) |
| Waiting-Room Wait Time & Cash Friendliness | $239.00 avg paid • 19 min lobby wait | 9 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.94/5 Listening • 4.86/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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