Quick answers
- Does Karl S. Tjerandsen accept Medicare assignment?
- Yes. Medicare's clinician data says Karl S. Tjerandsen 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 Karl S. Tjerandsen see?
- In 2024, CMS data shows 267 Original Medicare patients and 945 services for Karl S. Tjerandsen. This counts Original Medicare only and measures volume, not quality.
- What is Karl S. Tjerandsen's NPI number?
- 1487077566. 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 Karl S. Tjerandsen, 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 | 267 |
|---|---|
| Services billed to Medicare | 945 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)370 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)212 services
- Hospital discharge day management, more than 30 minutes (99239)171 services
- Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th (G0316)94 services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)31 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 cholesterol75%
- Arthritis60%
- Chronic kidney disease57%
- Heart failure54%
- Ischemic heart disease53%
Hospitals where Karl S. Tjerandsen works
Medicare's Facility Affiliation Data lists Karl S. Tjerandsen 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.
- Dayton General HospitalDayton, WA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 501302
- Providence St Mary Medical CenterWalla Walla, WA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 500002
- St Anthony HospitalPendleton, OR · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 381319
Practice locations
Addresses where Karl S. Tjerandsen is enrolled with Medicare (CMS data updated October 2, 2026).
- 401 W Poplar StWalla Walla, WA 99362 (509) 897‑3320
Group practices
Medicare enrollment lists Karl S. Tjerandsen as a member of this group (CMS data updated October 2, 2026).
- Providence Health and Services - Washington270 clinicians in the group
Specialties
- Hospitalistprimary
Other hospitalists in Walla Walla
Clinicians with the same Medicare primary specialty in Walla Walla, WA — not a recommendation.
Other clinicians in Providence Health and Services - Washington
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Oregon Health Sciences University School Of Medicine |
| Graduation year | 2017 (9 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1487077566 |
| 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