Frederick A. Matsen Iii, MD

Medicare activity in 2024

Official CMS public-use data for Frederick A. Matsen Iii, 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.

Most frequent services

1. Prosthetic repair of shoulder joint, total shoulder (23472)22 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 cholesterol66%
• High blood pressure62%
• Anxiety26%
• Osteoporosis24%
• Ischemic heart disease22%

Hospitals where Frederick A. Matsen Iii works

Medicare's Facility Affiliation Data lists Frederick A. Matsen Iii 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.

• University of Washington Medical CenterSeattle, WA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 500008

Practice locations

Addresses where Frederick A. Matsen Iii is enrolled with Medicare (CMS data updated October 2, 2026).

• 1701 Columbia RdSeattle, WA 98195 (206) 598‑3100
• 1959 NE Pacific StSeattle, WA 98195 (206) 598‑4333
• 4245 Roosevelt Way NESeattle, WA 98105 (206) 598‑7954

Group practices

Medicare enrollment lists Frederick A. Matsen Iii as a member of this group (CMS data updated October 2, 2026).

• The Association of University Physicians3,535 clinicians in the group

Specialties

• Orthopedic Surgeryprimary

Find other Orthopedic Surgery doctors in Washington →

Other orthopedic surgeons in Seattle

Clinicians with the same Medicare primary specialty in Seattle, WA — not a recommendation.

• Erika Roddy, MD
• Seth S. Leopold, MD
• Paul A. Manner, MD
• Andrea N. Rowland, MD
• Philip R. Downer, MD
• Conor P. Kleweno, MD
• Michael J. Gustin, MD
• Christian M. Peterson, DO

All orthopedic surgeons in Seattle →

Other clinicians in The Association of University Physicians

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Tanvi Aggarwal, NP
• Andrew R. Pistner, MD
• Ponchita Kollar, PA
• Angela D. Larsh, NP
• Stuart J. Shankland, MD
• Zachary L. Steinberg, MD

Clinician information

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

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians