Quick answers
- Does Charles W. Anderegg Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says Charles W. Anderegg Jr. 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 Charles W. Anderegg Jr. see?
- In 2024, CMS data shows 86 Original Medicare patients and 1,305 services for Charles W. Anderegg Jr.. This counts Original Medicare only and measures volume, not quality.
- What is Charles W. Anderegg Jr.'s NPI number?
- 1124056437. 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 Charles W. Anderegg Jr., 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 | 86 |
|---|---|
| Services billed to Medicare | 1,305 |
| Different services or procedures | 34 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, methylprednisolone acetate, 1 mg (J1010)1,121 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)32 services
- Aspiration and/or injection of fluid from large joint (20610)18 services
- X-ray of knee, 4 or more views (73564)17 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)16 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).
- Arthritis75%
- High cholesterol73%
- High blood pressure65%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)24%
- Diabetes22%
- Ischemic heart disease21%
Hospitals where Charles W. Anderegg Jr. works
Medicare's Facility Affiliation Data lists Charles W. Anderegg Jr. 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.
- Capital Medical CenterOlympia, WA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 500139
- Mason General Hospital & Family of ClinicsShelton, WA · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 501336
Practice locations
Addresses where Charles W. Anderegg Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 615 Lilly Rd NEOlympia, WA 98506 (360) 491‑4211
- 901 Mountain View DrShelton, WA 98584 (360) 426‑1611
Group practices
Medicare enrollment lists Charles W. Anderegg Jr. as a member of these groups (CMS data updated October 2, 2026).
- Olympia Orthopaedic Associates PLLC87 clinicians in the group
- Public Hospital District No 1 of Mason County57 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Olympia
Clinicians with the same Medicare primary specialty in Olympia, WA — not a recommendation.
Other clinicians in Olympia Orthopaedic Associates PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1996 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1124056437 |
| 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