Quick answers
- Which hospitals does Klaus D. Mergener work at?
- Medicare's official clinician data lists Klaus D. Mergener at 2 hospitals: Avera Heart Hospital of South Dakota and Avera McKennan Hospital & University Health Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Klaus D. Mergener see patients?
- Medicare's clinician data lists 6 practice locations, including Sioux Falls, SD, Everett, WA and Edmonds, WA. Call before your visit to confirm the address.
- What is Klaus D. Mergener's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Klaus D. Mergener accept Medicare assignment?
- Yes. Medicare's clinician data says Klaus D. Mergener 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 Klaus D. Mergener?
- (425) 977-4620, as listed in official Medicare / NPI Registry data.
- What is Klaus D. Mergener's NPI number?
- 1578537031. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Klaus D. Mergener works
Medicare's Facility Affiliation Data lists Klaus D. Mergener at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Avera Heart Hospital of South DakotaSioux Falls, SD · Acute Care Hospital · CCN 430095
- Avera McKennan Hospital & University Health CenterSioux Falls, SD · Acute Care Hospital · CCN 430016
Practice locations
Addresses where Klaus D. Mergener is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1000 E 23rd StSioux Falls, SD 57105
- 13020 Meridian Ave SEverett, WA 98208 (425) 977‑4620
- 1325 S Cliff AveSioux Falls, SD 57105
- 1325 S Cliff Ave, RadiologySioux Falls, SD 57105 (605) 322‑4878
- 21600 Hwy 99, Suite 260Edmonds, WA 98026 (425) 774‑2650
Group practices
Medicare enrollment lists Klaus D. Mergener as a member of these groups (CMS data updated 2026-10-02).
- Avera McKennan959 clinicians in the group
- Puget Sound Gastroenterology PLLC61 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Sioux Falls
Clinicians with the same Medicare primary specialty in Sioux Falls, SD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578537031 |
| 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