Chelsea Ma, MD
Dermatology · Stanford, CANPI 1871936575
Payments from drug & device makers
Across 37 payments — averaging $259.10 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- E.r. Squibb & Sons, L.L.C.$8K
- Amgen$581
- AbbVie$514
- Organon$168
- Galderma Laboratories, L.p.$112
- Janssen Scientific Affairs, LLC$101
- plus $139 from 3 others
What the payments were for
- Consulting fees$5,61059%
- Travel & lodging$1,18312%
- Food & beverage$2,76329%
- Education$310%
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| E.r. Squibb & Sons, L.L.C. | 19 | $7,971 |
| Amgen | 5 | $581 |
| AbbVie | 5 | $514 |
| Organon | 1 | $168 |
| Galderma Laboratories, L.p. | 1 | $112 |
| Janssen Scientific Affairs, LLC | 1 | $101 |
| Sanofi | 2 | $79 |
| Pfizer | 2 | $31 |
| Ortho Dermatologics, A Division Of Bausch Health US, LLC | 1 | $30 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
How this compares
$9,587 in reported general payments places this provider in the 75th percentile of 1,875 dermatology providers in California.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Skyrizi PenRisankizumab-Rzaa | 18 | $362,009 |
| Dupixent PenDupilumab | 71 | $263,099 |
| TremfyaGuselkumab | 14 | $192,259 |
| Dupixent SyringeDupilumab | 25 | $94,225 |
| Clobetasol Propionate | 109 | $5,770 |
| Tretinoin | 50 | $5,590 |
| Tacrolimus | 27 | $3,947 |
| Fluorouracil | 46 | $3,779 |
| Fluocinonide | 78 | $3,070 |
| Ketoconazole | 178 | $2,590 |
| Doxycycline Hyclate | 69 | $1,246 |
| Azelaic Acid | 15 | $1,222 |
| Ciclopirox | 32 | $1,206 |
| Desonide | 23 | $951 |
| Triamcinolone Acetonide | 93 | $914 |
Paid to pharmacies, not to this prescriber.
Other dermatology in Stanford
- Anne ChangStanford$2.1M
- Youn Hee KimStanford$1.5M
- Golara HonariStanford$1.5M
- Justin KoStanford$1M
- Albert ChiouStanford$900K
- Vivian LaquerIrvine$20.9M
- Howard SofenLos Angeles$16.1M
- Raja SivamaniSacramento$11.8M
- Jennifer SoungSanta Ana$10.3M
- Stacy SmithEncinitas$7.9M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.