Klaus D. Mergener, M.D.
NPI 1578537031ActiveIndividual· Internal Medicine, Gastroenterology· Edmonds, WA
Internal Medicine, Gastroenterology (M.D.) with Avera McKennan and 1 other group, practicing in Edmonds, Washington. Medicare paid $44,771 for services to 165 patients in 2024. Cook Medical LLC was the largest of 5 companies reporting payments in 2025, $305.99 in all, mostly food and beverage. Lists Avera Heart Hospital of South Dakota and 1 other hospital as hospital affiliations.
Overview
| NPI | 1578537031 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 13, 2006 |
| Last updated in NPPES | Oct 25, 2024 |
| Certified by provider | Oct 25, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | MD00039380 | WA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (SD); Practitioner - Gastroenterology (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 165 |
|---|---|
| Services billed | 427 across 38 procedure codes |
| Paid by Medicare | $44,771 |
Education and affiliations
| Graduation year | 1989 |
|---|---|
| Medicare specialty | Gastroenterology |
Medical groups
- Avera McKennanSioux Falls, SD · 959 clinicians
- Puget Sound Gastroenterology PLLCEdmonds, WA · 61 clinicians
Hospital affiliations
- Avera Heart Hospital of South DakotaSioux Falls, SD
- Avera McKennan Hospital & University Health CenterSioux Falls, SD
Industry payments (Open Payments)
- 2025$305.99 · 9 payments from 5 companies
- 2024$151.30 · 4 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Cook Medical LLC | $191.42 | 4 |
| Aimmune Therapeutics, Inc. | $41.86 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $31.12 | 1 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $23.55 | 1 |
| Phathom Pharmaceuticals, Inc. | $18.04 | 1 |
What the 2025 payments were for
- Food and Beverage$305.99 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 18 gastroenterologists in Edmonds · All gastroenterologists in Washington