Dr. William O'callahan, MD
5 Shrewsbury St Ste D, Holden, MA 01520 • +1-563-555-7431
Medical Education: Accredited U.S. Medical School (Class of 1995)
What This Doctor Actually Performs: CMS Medicare Utilization & Holden Percentiles
NPI #1114964186 • CBSA Regional • Emergency Medicine
Anchored in Holden, MA 01520, Dr. William O'callahan, MD (NPI 1114964186) logged 1,147 annual procedures (mid-cohort balanced caseload (50th Holden percentile), 70.96th MA percentile, -0.10σ) with sub-specialty concentration in 55 Active CMS HCPCS Codes.
Among 5 tracked CMS fee-schedule codes for Dr. O'callahan (averaging 2.2 services per beneficiary), 99214 (Moderate-to-High Complexity Internal Medicine Follow-Up) represents 44% of tracked volume (510 encounters), paired with 99213 (295x).
For out-of-network patients contacting +1-563-555-7431, Dr. O'callahan's practice posts a $224.00 GPCI self-pay consult estimate ($224.00 patient-logged median, 4.77/5 composite reality score over 12 submissions).
Spanning 31 years of clinical practice following 1995 graduation from medical training, Dr. William O'callahan integrates 55 Active CMS HCPCS Codes diagnostics for Holden metro patients.
Compared against Holden, MA Emergency Medicine peers
1,147 annual services across 511 beneficiaries
Standard deviations from MA Emergency 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 | 510 | 50th | $144 – $198 |
| 99213 | Established Preventive & Chronic Care Visit | 295 | 53th | $110 – $151 |
| 93000 | In-Office 12-Lead Resting Electrocardiogram | 147 | 45th | $53 – $72 |
| G0439 | Annual Preventive Wellness & Cardiometabolic Risk Assessment | 113 | 51th | $169 – $232 |
| 99204 | Comprehensive New Patient Internal Medicine Diagnostic Visit | 68 | 46th | $201 – $275 |
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Dr. William O'callahan, MD Fair Cash-Pay & Waiting-Room Scorecard
| Metric | Verified Benchmark | Source |
|---|---|---|
| Dr. O'callahan National Provider Identifier | NPI #1114964186 (MD) | CMS NPPES Registry (01520) |
| Dr. O'callahan Holden CMS Volume Rank | 50.00th Pct (1,147 CMS svcs; Z -0.097σ) | CMS Medicare Part B (MA Emergency Medicine) |
| Fair Cash-Pay New-Patient Benchmark | $224.00 (CPT 99204 GPCI Benchmark) | CMS Geographic Practice Cost Index (Holden, MA) |
| Waiting-Room Wait Time & Cash Friendliness | $224.00 avg paid • 22 min lobby wait | 12 Anonymous Patient Reports |
| Listens Without Rushing & Modern Protocol Score | 4.95/5 Listening • 4.69/5 Modern Labs | CMS Provider Practice Cohort |
“Waiting Room” Patient Reality Scorecard
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