Quick answers
- Does Karen L. Johnson accept Medicare assignment?
- Yes. Medicare's clinician data says Karen L. Johnson 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 Karen L. Johnson see?
- In 2024, CMS data shows 216 Original Medicare patients and 352 services for Karen L. Johnson. This counts Original Medicare only and measures volume, not quality.
- What is Karen L. Johnson's NPI number?
- 1073841227. 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 Karen L. Johnson, 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 | 216 |
|---|---|
| Services billed to Medicare | 352 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Anesthesia for lens surgery (00142)307 services
- Anesthesia for other procedure on eye (00140)36 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 cholesterol62%
- Arthritis32%
- Diabetes27%
- Depression22%
- Anxiety18%
Practice locations
Addresses where Karen L. Johnson is enrolled with Medicare (CMS data updated October 2, 2026).
- 1321 W Dakota PkwyWilliston, ND 58801 (701) 572‑7711
Group practices
Medicare enrollment lists Karen L. Johnson as a member of this group (CMS data updated October 2, 2026).
- Trinity Health290 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), North Dakota →
Other nurse anesthetists in Williston
Clinicians with the same Medicare primary specialty in Williston, ND — not a recommendation.
Other clinicians in Trinity Health
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1073841227 |
| 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
- 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