Yoon Hee A. Chang, MD

Medicare activity in 2024

Official CMS public-use data for Yoon Hee A. Chang, 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. Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)209 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)149 services
3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)74 services
4. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)54 services
5. Sleep study including heart rate, breathing, airflow, and effort (95806)51 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 cholesterol75%
• High blood pressure71%
• Arthritis53%
• Ischemic heart disease31%
• Depression28%
• Anxiety27%

Hospitals where Yoon Hee A. Chang works

Medicare's Facility Affiliation Data lists Yoon Hee A. Chang 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.

• Evergreenhealth Medical CenterKirkland, WA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 500124

Practice locations

Addresses where Yoon Hee A. Chang is enrolled with Medicare (CMS data updated October 2, 2026).

• 11521 NE 128th St, Suite 130Kirkland, WA 98034 (425) 899‑4280

Group practices

Medicare enrollment lists Yoon Hee A. Chang as a member of this group (CMS data updated October 2, 2026).

• King County Public Hospital District No 2608 clinicians in the group

Specialties

• Sleep Medicineprimary
• Internal Medicinealso

Find other Sleep Medicine doctors in Washington →

Other sleep medicine doctors in Washington

Clinicians with the same Medicare primary specialty in Washington — not a recommendation.

• Supriya K. Mystkowski, MD
• Chris A. Chou, MD
• Christopher K. Cheng, MD
• Jessica Roberts, DO
• Sussan Kokinda, DO
• Martha E. Billings, MD
• Akhil Raghuram, MD
• Jordan T. Standlee, MD

All sleep medicine doctors in Washington →

Other clinicians in King County Public Hospital District No 2

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

• David D. Siew, MD
• Cindy C. Beavon, NP
• Matthew S. Hauswald, PA
• Trisanna M. Gruel, NP
• Briana M. Desmet, PA
• Peter Schoonmaker, 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