Quick answers
- Which hospitals does William S. Trask Iv work at?
- Medicare's official clinician data lists William S. Trask Iv at 1 hospital: Boulder Community Health. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William S. Trask Iv see patients?
- Medicare's clinician data lists 1 practice location in Boulder, CO. Call before your visit to confirm the address.
- What is William S. Trask Iv's specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does William S. Trask Iv accept Medicare assignment?
- Yes. Medicare's clinician data says William S. Trask Iv accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William S. Trask Iv?
- (303) 415-7000, as listed in official Medicare / NPI Registry data.
- What is William S. Trask Iv's NPI number?
- 1184706608. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William S. Trask Iv works
Medicare's Facility Affiliation Data lists William S. Trask Iv at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Boulder Community HealthBoulder, CO · Acute Care Hospital · CCN 060027
Practice locations
Addresses where William S. Trask Iv is enrolled with Medicare (CMS data updated 2026-10-02).
- 4747 Arapahoe AveBoulder, CO 80303 (303) 415‑7000
Group practices
Medicare enrollment lists William S. Trask Iv as a member of this group (CMS data updated 2026-10-02).
- Boulder Valley Anesthesiology, PLLC61 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Boulder
Clinicians with the same Medicare primary specialty in Boulder, CO — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | At Still University Of Health Sciences, College Of Osteo Med, Kirksville |
| Graduation year | 2006 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1184706608 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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