Xiying M. Fan, MD

Medicare activity in 2024

Official CMS public-use data for Xiying M. Fan, 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. Destruction of precancer skin growth, 2-14 growths (17003)181 services
2. Destruction of precancer skin growth, 1 growth (17000)43 services
3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)43 services
4. Destruction of skin growth, 1-14 growths (17110)29 services
5. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)28 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%
• Arthritis52%
• Diabetes27%
• Ischemic heart disease27%
• Anxiety24%

Hospitals where Xiying M. Fan works

Medicare's Facility Affiliation Data lists Xiying M. Fan 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.

• UCI Health-OrangeOrange, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050348

Practice locations

Addresses where Xiying M. Fan is enrolled with Medicare (CMS data updated October 2, 2026).

• 101 the City Dr SOrange, CA 92868 (714) 456‑7004

Group practices

Medicare enrollment lists Xiying M. Fan as a member of this group (CMS data updated October 2, 2026).

• UCI Department of Dermatology39 clinicians in the group

Specialties

• Dermatologyprimary

Find other Dermatology doctors in California →

Other dermatologists in Orange

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

• Melissa L. Shive, MD
• Kristen M. Kelly, MD
• Michael B. Mortazie, DO
• Jessica W. Hsu, MD
• Hui Kyung T. Kim, MD
• Katerina L. Yale, MD
• Heidi N. Goodarzi, MD
• Kenneth G. Linden

All dermatologists in Orange →

Other clinicians in UCI Department of Dermatology

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

• Melissa L. Shive, MD
• Kristen M. Kelly, MD
• Allene Fonseca, MD
• Michelle Aszterbaum, MD
• Natasha Mesinkovska, MD
• Aditi A. Sharma, 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