Quick answers
- Does Geoffrey J. Yoon accept Medicare assignment?
- Yes. Medicare's clinician data says Geoffrey J. Yoon 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 Geoffrey J. Yoon see?
- In 2024, CMS data shows 27 Original Medicare patients and 34 services for Geoffrey J. Yoon. This counts Original Medicare only and measures volume, not quality.
- What is Geoffrey J. Yoon's NPI number?
- 1023298353. 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 Geoffrey J. Yoon, 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 | 27 |
|---|---|
| Services billed to Medicare | 34 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
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 pressure74%
- High cholesterol74%
- Diabetes41%
Hospitals where Geoffrey J. Yoon works
Medicare's Facility Affiliation Data lists Geoffrey J. Yoon 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.
- Kaiser Foundation Hospital - Orange County - AnaheimAnaheim, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050609
Practice locations
Addresses where Geoffrey J. Yoon is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 3430 E La Palma AveAnaheim, CA 92806 (888) 988‑2800
- 3460 E La Palma AveAnaheim, CA 92806 (714) 644‑2010
- 5475 E La Palma AveAnaheim, CA 92807 (714) 279‑6088
- 6640 Alton PkwyIrvine, CA 92618 (949) 932‑5000
- 6650 Alton PkwyIrvine, CA 92618 (949) 932‑5000
Group practices
Medicare enrollment lists Geoffrey J. Yoon as a member of this group (CMS data updated October 2, 2026).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Advanced Heart Failure and Transplant Cardiologyprimary
- Cardiovascular Disease (Cardiology)also
- Critical Care (Intensivists)also
- Internal Medicinealso
Find other Advanced Heart Failure and Transplant Cardiology doctors in California →
Other heart failure and transplant cardiologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
- Jonathan Nattiv, MD
- Michael Yeh, MD
- Michael W. Fong, MD
- Tishangi K. Agrawal, MD
- Swaiman Singh, MD
- Dmitry Abramov, MD
- Ajay S. Vaidya, MD
- Munir S. Janmohamed, MD
All heart failure and transplant cardiologists in California →
Other clinicians in Southern California Permanente Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Johns Hopkins University School Of Medicine |
| Graduation year | 2007 (19 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023298353 |
| 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