Chelsea Ma, MD
NPI 1871936575ActiveIndividual· Dermatology· Stanford, CA
Dermatology (MD) with Stanford Health Care, practicing in Stanford, California. Their prescriptions cost Medicare Part D more than their services did: $1,004,300 for 1,274 claims, against $166,244 paid for services in 2024. Organon LLC was the largest of 4 companies reporting payments in 2025, $547.75 in all, mostly food and beverage. Lists Stanford Health Care as a hospital affiliation.
Overview
| NPI | 1871936575 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 11, 2013 |
| Last updated in NPPES | Apr 16, 2024 |
| Certified by provider | Apr 16, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | A145259 | CA |
| Internal Medicine | 207R00000X | 264303 | MA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Dermatology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 836 |
|---|---|
| Services billed | 5,214 across 51 procedure codes |
| Paid by Medicare | $166,244 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,274 · 1,535 30-day fills |
|---|---|
| Patients | 394 |
| Total drug cost | $1,004,300 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 2015 |
|---|---|
| Medicare specialty | Dermatology |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$547.75 · 4 payments from 4 companies
- 2024$667.79 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Organon LLC | $167.86 | 1 |
| E.R. Squibb & Sons, L.L.C. | $150.00 | 1 |
| Abbvie Inc. | $127.99 | 1 |
| Amgen Inc. | $101.90 | 1 |
What the 2025 payments were for
- Food and Beverage$547.75 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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