Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Alvin Li

Individual provider Dermatology Physician · NPI 1225531007

Alvin Li practises Dermatology in San Mateo, California. Graduated from Yale University School of Medicine in 2018, 8 years ago. Practices with Csi Medical Group, a 104-clinician group, works from 5 locations and accepts Medicare assignment. Licensed in California and Illinois.

Years since qualifying
8
Trained at
Yale University School of Medicine
Licensed in
CA, IL
In the registry since
2018
Specialties on file
2
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Practice location Address checks out

136 N San Mateo Dr Fl 2
San Mateo, CA 94401-2778
Phone: (650) 348-1242
Fax: (650) 348-0788
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (4)

  • 525 South Dr Ste 115, Mountain View, CA 94040-4211 — (650) 969-5600
  • 2420 Samaritan Dr, San Jose, CA 95124-3907 — (408) 369-5600
  • 123 York St Apt 7g, New Haven, CT 06511-5624 — (408) 510-2791
  • 420 E Superior St, Chicago, IL 60611-4494 — (312) 503-7975

Specialties & licences

Dermatology Physician (primary) Taxonomy 207N00000X · Licence A176382 (CA)
Dermatology Physician Taxonomy 207N00000X · Licence 125.073474 (IL)

Record details

NPI number1225531007
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedMarch 17, 2018
Last updated in NPPESDecember 19, 2023
Certification dateDecember 19, 2023

Medicare enrollment

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

Medicare specialtyDERMATOLOGY
Medical schoolYALE UNIVERSITY SCHOOL OF MEDICINE
Graduated 2018 (8 years in practice)
Group practice Csi Medical Group — 104 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.

Melanoma (skin cancer) excision 231 times · 98th percentile
Removal of skin lesions 635 times · 89th percentile
Skin biopsy 222 times · 86th percentile
Removal or shaving of skin growth 55 times · 80th percentile
Removal of skin cancer 581 times · 66th percentile
Removal of tissue 1–10 times

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 patients621
Services billed 4,058 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $1,561 59 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Csi Medical Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 104 clinicians in the practice; 12 are shown here.

Other providers in San Mateo