Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Joan Chia-Chiu Wu, MD

Individual provider Dermatology Physician · NPI 1144345372

Joan Chia-Chiu Wu, MD practises Dermatology in Los Angeles, California. Graduated from University of California, San Diego School of Medicine in 1995, 31 years ago. Practices with On Site Dermatology of California, PC, a 2-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
31
Trained at
University of California, San Diego School of Medicine
Licensed in
CA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

100 UCLA Medical Plz Ste 730
Los Angeles, CA 90024-6970 Not confirmed with CMS for 19 years — call before visiting
Phone: (310) 209-1440
Fax: (310) 209-0070
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Dermatology Physician (primary) Taxonomy 207N00000X · Licence A75942 (CA)

Record details

NPI number1144345372
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 20, 2007
Last updated in NPPESJuly 8, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyDERMATOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, SAN DIEGO SCHOOL OF MEDICINE
Graduated 1995 (31 years in practice)
Group practice On Site Dermatology Of California, Pc — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 391 times · 84th percentile
Skin biopsy 28 times · 65th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients172
Services billed 963 a service is one billed item, such as a visit, a test or a procedure
Average patient age88

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at On Site Dermatology of California, PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Los Angeles