Quick answers
- Does Darren P. Oneill accept Medicare assignment?
- Yes. Medicare's clinician data says Darren P. Oneill accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Darren P. Oneill see?
- In 2024, CMS data shows 2,003 Original Medicare patients and 196,738 services for Darren P. Oneill. This counts Original Medicare only and measures volume, not quality.
- What is Darren P. Oneill's NPI number?
- 1982781373. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Darren P. Oneill, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 2,003 |
|---|---|
| Services billed to Medicare | 196,738 |
| Different services or procedures | 53 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (Q9967)185,642 services
- Low osmolar contrast material, 200-299 mg/ml iodine concentration, per ml (Q9966)9,019 services
- Ct scan head or brain without contrast (70450)477 services
- Infusion, normal saline solution , 1000 cc (J7030)330 services
- Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)283 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol74%
- Arthritis47%
- Ischemic heart disease31%
- Chronic kidney disease30%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)30%
Hospitals where Darren P. Oneill works
Medicare's Facility Affiliation Data lists Darren P. Oneill at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Community Memorial HospitalMenomonee Falls, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520103
- Froedtert Community HospitalNew Berlin, WI · Acute Care Hospital · Emergency services: listed by Medicare · CCN 520213
- Froedtert Memorial Lutheran HospitalMilwaukee, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520177
- St Josephs Community Hospital West BendWest Bend, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520063
Practice locations
Addresses where Darren P. Oneill is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 11; the Medicare profile lists all.
- 1155 N Mayfair Rd, Fl 2Milwaukee, WI 53226 (414) 955‑4263
- 2315 E Moreland BlvdWaukesha, WI 53186 (262) 532‑5700
- 2315 E Moreland Blvd, Suite 100Waukesha, WI 53186 (262) 532‑5700
- 3200 Pleasant Valley RdWest Bend, WI 53095 (262) 836‑7300
- 3212 Pleasant Valley RdWest Bend, WI 53095 (262) 334‑6165
Group practices
Medicare enrollment lists Darren P. Oneill as a member of these groups (CMS data updated October 2, 2026).
- The Medical College of Wisconsin Inc2,115 clinicians in the group
- Froedtert Andthe Medical College of Wisconsin Community Physicians Inc1,285 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Milwaukee
Clinicians with the same Medicare primary specialty in Milwaukee, WI — not a recommendation.
Other clinicians in The Medical College of Wisconsin Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1982781373 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians