Dr. Mark Northfield, MD
1496 Professional Drive, Suite 601, Petaluma, CA 94954 • +1-688-555-2152
Medical Education: Accredited U.S. Medical School (Class of 2003)
What This Doctor Actually Performs: CMS Medicare Utilization & Petaluma Percentiles
NPI #1861406316 • CBSA Regional • Orthopedic Surgery
CMS Medicare Part B utilization records credit Dr. Mark Northfield (MD, NPI 1861406316) at 1496 Professional Drive, Suite 601 in Petaluma with 5,451 annual clinical services (356 beneficiaries), corresponding to a +0.02σ regional deviation and top-decile high-throughput specialist (99th percentile in Petaluma) with sub-specialty concentration in 56 Active CMS HCPCS Codes.
Fee-schedule auditing of NPI 1861406316 highlights 368 annual claims for 99213 (99th Petaluma percentile; $40–$55 self-pay corridor) plus 276 encounters under 20610 and 194 under 73562.
At 1496 Professional Drive, Suite 601 (94954), Dr. Mark Northfield, MD accommodates direct self-pay scheduling (hybrid in-clinic and telehealth video consults) at ~$239.00 per new consult (4.77/5 bedside rating).
From 1496 Professional Drive, Suite 601 in Petaluma (+1-688-555-2152), Dr. Northfield, MD (23-year clinical track record) delivers 56 Active CMS HCPCS Codes care.
Top 10% Orthopedic Surgery volume leader in Petaluma, CA
5,451 annual services across 356 beneficiaries
Standard deviations from CA Orthopedic Surgery mean utilization
Top Billed HCPCS/CPT Procedures & GPCI Self-Pay Cash Benchmarks
| HCPCS | Clinical Procedure Description | Annual Volume | Local Pct | Est. Cash Range |
|---|---|---|---|---|
| 99213 | Focused Orthopedic Joint & Spine Mobility Evaluation | 368 | 99th | $40 – $55 |
| 20610 | Major Joint (Knee/Shoulder/Hip) Aspiration or Injection | 276 | 99.5th | $42 – $58 |
| 73562 | Radiologic Weight-Bearing 3-View Knee Examination | 194 | 97th | $25 – $40 |
| 99203 | New Patient Musculoskeletal Injury & Surgical Triage | 113 | 98th | $57 – $78 |
| 27447 | Total Knee Arthroplasty Joint Reconstruction | 72 | 99.5th | $366 – $502 |
| 96372 | Therapeutic Subcutaneous/Intramuscular Injection Administration (56 HCPCS billing breadth) | 4,428 | 99th | $45 – $65 |
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Dr. Mark Northfield, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. Northfield National Provider Identifier | NPI #1861406316 (MD) | CMS NPPES Registry (94954) |
| Dr. Northfield Petaluma CMS Volume Rank | 99.00th Pct (5,451 CMS svcs; Z +0.023σ) | CMS Medicare Part B (CA Orthopedic Surgery) |
| Fair Cash-Pay New-Patient Benchmark | $239.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Petaluma, CA) |
| Waiting-Room Wait Time & Cash Friendliness | $239.00 avg paid • 17 min lobby wait | 11 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.77/5 Listening • 4.81/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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