Quick answers
- Which hospitals does Donald L. Slack work at?
- Medicare's official clinician data lists Donald L. Slack at 3 hospitals: Cascade Valley Hospital, Island Hospital and Skagit Valley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Donald L. Slack see patients?
- Medicare's clinician data lists 2 practice locations, including Mount Vernon, WA and Tacoma, WA. Call before your visit to confirm the address.
- What is Donald L. Slack's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Donald L. Slack accept Medicare assignment?
- Yes. Medicare's clinician data says Donald L. Slack 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 Donald L. Slack?
- (360) 424-4111, as listed in official Medicare / NPI Registry data.
- What is Donald L. Slack's NPI number?
- 1700816345. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Donald L. Slack works
Medicare's Facility Affiliation Data lists Donald L. Slack at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Cascade Valley HospitalArlington, WA · Acute Care Hospital · CCN 500060
- Island HospitalAnacortes, WA · Acute Care Hospital · CCN 500007
- Skagit Valley HospitalMount Vernon, WA · Acute Care Hospital · CCN 500003
Practice locations
Addresses where Donald L. Slack is enrolled with Medicare (CMS data updated 2026-10-02).
- 1415 E Kincaid StMount Vernon, WA 98274 (360) 424‑4111
- 1717 S J StTacoma, WA 98405 (253) 627‑4101
Group practices
Medicare enrollment lists Donald L. Slack as a member of this group (CMS data updated 2026-10-02).
- Northwest Emergency Physicians LLC271 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Mount Vernon
Clinicians with the same Medicare primary specialty in Mount Vernon, WA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Washington School Of Medicine |
| Graduation year | 1991 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1700816345 |
| 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