Wei-Fang Ko, MD

Medicare activity in 2024

Official CMS public-use data for Wei-Fang Ko, 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. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)231 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)121 services
3. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)113 services
4. New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more (99202)72 services
5. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)71 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 pressure75%
• High cholesterol75%
• Diabetes48%
• Arthritis36%
• Chronic kidney disease30%
• Ischemic heart disease26%

Hospitals where Wei-Fang Ko works

Medicare's Facility Affiliation Data lists Wei-Fang Ko 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.

• Eden Medical CenterCastro Valley, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050488

Practice locations

Addresses where Wei-Fang Ko is enrolled with Medicare (CMS data updated October 2, 2026).

• 19845 Lake Chabot Rd, Suite 104Castro Valley, CA 94546 (510) 537‑4415
• 2080 Century Park E, Suite 703Los Angeles, CA 90067 (424) 274‑3346
• 320 Santa Fe Dr, Suite 108Encinitas, CA 92024 (760) 436‑4558

Group practices

Medicare enrollment lists Wei-Fang Ko as a member of these groups (CMS data updated October 2, 2026).

• Genesis Healthcare Partners PC228 clinicians in the group
• Gastroenterology Specialists Medical Group Inc a Medical Corporation5 clinicians in the group

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in California →

Other gastroenterologists in Castro Valley

Clinicians with the same Medicare primary specialty in Castro Valley, CA — not a recommendation.

• Abhik Roy, MD
• Satya Allaparthi, MD
• Saurabh Gupta, MD
• Jeffrey D. Singerman, MD
• Ann C. Robinson, MD

All gastroenterologists in Castro Valley →

Other clinicians in Genesis Healthcare Partners PC

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

• Wei-Chung Chen, MD
• Carol E. Salem, MD
• Ernest H. Agatstein, MD
• Vincent Scheuher, CNA
• Brian M. Dicks, MD
• Hsuan-Ling Liao

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