Quick answers
- Does Chelsea Posenjak accept Medicare assignment?
- Yes. Medicare's clinician data says Chelsea Posenjak 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 Chelsea Posenjak see?
- In 2024, CMS data shows 134 Original Medicare patients and 156 services for Chelsea Posenjak. This counts Original Medicare only and measures volume, not quality.
- What is Chelsea Posenjak's NPI number?
- 1003293127. 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 Chelsea Posenjak, 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 | 134 |
|---|---|
| Services billed to Medicare | 156 |
| Different services or procedures | 39 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Anesthesia for open or endoscopic total shoulder joint replacement (01638)19 services
- Continuous infusion of anesthetic agent and/or steroid into arm nerve bundle through catheter (64416)16 services
- Anesthesia for lens surgery (00142)15 services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)11 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 pressure69%
- High cholesterol65%
- Arthritis57%
- Diabetes23%
- Ischemic heart disease21%
- Anxiety21%
Hospitals where Chelsea Posenjak works
Medicare's Facility Affiliation Data lists Chelsea Posenjak 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.
- St Michael Medical CenterSilverdale, WA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 500039
Practice locations
Addresses where Chelsea Posenjak is enrolled with Medicare (CMS data updated October 2, 2026).
- 1800 NW Myhre Rd, Michael Medical CtrSilverdale, WA 98383 (360) 744‑6770
- 2200 NW Myhre Rd, Charles L Salmon MD Medical CenterSilverdale, WA 98383 (360) 830‑1101
Group practices
Medicare enrollment lists Chelsea Posenjak as a member of this group (CMS data updated October 2, 2026).
- Olympic Anesthesia Services, Inc35 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), Washington →
Other nurse anesthetists in Silverdale
Clinicians with the same Medicare primary specialty in Silverdale, WA — not a recommendation.
Other clinicians in Olympic Anesthesia Services, Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1003293127 |
| 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