Karen Y Chen, PA
Physician Assistant · San Francisco
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- Not verified
- Not the same as out of network.
- Offices
- 3
Offices
3 locations · Csi Medical Group · 104 clinicians in this group
Looking this up.
Plan participation
Not verified
We could not verify current plan participation for this doctor. This does not mean they are out of network. Call Karen Y Chen’s office to ask if they take your plan before you enroll.
California Medical Board record
Licence A60110 · Current
Licensed to practise in California · since 1996 · expires 2028-01-31 · Johns Hopkins University School of Medicine.
Matched on the licence number without its letter prefix; check the name before relying on it.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
Original Medicare doctor bills
$22,359
Medicare paid this office $22,359 for 115 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Short return visit (20+ min) | 50 | $4,433 | $67 |
| New patient visit (30+ min) | 42 | $3,140 | $75 |
| Return visit (30+ min) | 16 | $2,313 | $101 |
| Destruction of skin growth, 1-14 growths | 25 | $2,226 | $86 |
| Biopsy of related skin growth, first growth | 20 | $1,549 | $77 |
See all 9 services
| Short return visit (20+ min) | 50 | $4,433 | $67 |
| New patient visit (30+ min) | 42 | $3,140 | $75 |
| Return visit (30+ min) | 16 | $2,313 | $101 |
| Destruction of skin growth, 1-14 growths | 25 | $2,226 | $86 |
| Biopsy of related skin growth, first growth | 20 | $1,549 | $77 |
| Destruction of precancer skin growth, 1 growth | 24 | $1,024 | $37 |
| Short return visit | 16 | $799 | $44 |
| Destruction of precancer skin growth, 2-14 growths | 19 | $604 | $6 |
| New patient visit (15+ min) | 11 | $477 | $43 |
Procedures Medicare counted
| Melanoma (skin cancer) excision | 1-10 | None |
| Removal of skin lesions | 57 | More than 73% of doctors who do this |
| Removal or shaving of skin growth | 1-10 | None |
| Skin biopsy | 17 | More than 62% of doctors who do this |
Who their Medicare patients are
115 Original Medicare patients in 2024. Average age 76 · Women 47% · Also on Medicaid 15% · Health risk score 1.07. At or below the middle of the specialty; the typical physician assistant clinician is at 1.31.
Conditions among them: High blood pressure 70% · Diabetes 31% · Coronary heart disease 21% · Atrial fibrillation 20% · Chronic kidney disease 18% · Cancer 18% · Depression 14% · Heart failure 13% · COPD 10%.
The office billed $58,219, Medicare allowed $30,727 and paid $22,359; for 386 services of 31 kinds.
Original Medicare patients only. A risk score of 1.0 is the average Medicare patient; higher means sicker. Any count under 11 is hidden.
Year by year
| 2024 | 115 | 386 | 76 | 1.07 | $58,219 | $22,359 |
| 2023 | 100 | 347 | 74 | 0.94 | $54,594 | $18,570 |
Original Medicare only. A service billed for fewer than 11 people in a year is hidden, so the lines can add up to less than the year's total.
See the services billed each year
2023: 7 services
| New patient visit (30+ min) | 44 | $2,939 | $67 |
| New patient visit (45+ min) | 29 | $2,757 | $95 |
| Destruction of skin growth, 1-14 growths | 30 | $2,576 | $81 |
| Short return visit (20+ min) | 19 | $1,865 | $67 |
| Biopsy of related skin growth, first growth | 28 | $1,849 | $64 |
| Destruction of precancer skin growth, 1 growth | 25 | $946 | $32 |
| Destruction of precancer skin growth, 2-14 growths | 18 | $480 | $5 |
Drugs they prescribed that Part D paid
$31,233
Pharmacies billed $31,233 in 2024.
This is pharmacy cost, not the office bill, and not what patients paid.
Opioids were 0% of their Part D prescriptions (0 of 210) in 2024. At or below the middle of the specialty; the typical physician assistant clinician is at 1%.
197 generic and 13 brand-name prescriptions · $31,233 in drug cost.
Part D prescriptions only. The opioid rate is opioid prescriptions as a share of all this clinician's Part D prescriptions; surgeons and pain specialists run higher than others, so it is shown against the same specialty.
| Clobetasol Propionate | 14 | $1,774 | $71 |
| Ketoconazole | 24 | $523 | $15 |
| Triamcinolone Acetonide | 29 | $278 | $8 |
| Mupirocin | 12 | $157 | $9 |
Year by year
| 2024 | 210 | 106 | 0% (0) | 6% | $31,233 |
| 2023 | 216 | 114 | 0% (0) | None | $14,425 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 4 drugs
| Ketoconazole | 61 | $1,667 | $27 |
| Clobetasol Propionate | 14 | $1,017 | $73 |
| Clindamycin Phosphate | 14 | $779 | $56 |
| Triamcinolone Acetonide | 53 | $429 | $8 |
Money from drug and device companies
$3,101 in 2025
| 2025 | 15 | 81 | None | $3,101 |
| 2024 | 16 | 117 | None | $5,092 |
| 2023 | 14 | 77 | None | $2,888 |
| 2022 | 8 | 14 | None | $406 |
| 2021 | 1 | 4 | None | $188 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Organon | Vtama | $422 | 5 payments
|
| Incyte | Opzelura | $413 | 10 payments
|
| LEO Pharma | Adbry | $413 | 14 payments
|
| Galderma Laboratories L.P. | Nemluvio | $373 | 8 payments
|
| Abbvie | Rinvoq | $296 | 8 payments
|
| Arcutis Biotherapeutics | Zoryve | $199 | 11 payments
|
See all 81 published payments
| LEO Pharma | Meals · 2025-12-18 | Adbry | $191 |
| Arcutis Biotherapeutics | Meals · 2025-11-06 | Zoryve | $16 |
| Organon | Meals · 2025-10-14 | Vtama | $9 |
| Sun Pharmaceutical Industries | Meals · 2025-10-08 | Winlevi | $138 |
| Incyte | Meals · 2025-09-25 | Opzelura | $140 |
| Abbvie | Meals · 2025-09-16 | Skyrizi | $18 |
| Arcutis Biotherapeutics | Meals · 2025-09-09 | Zoryve | $32 |
| LEO Pharma | Meals · 2025-09-05 | Adbry | $15 |
| Galderma Laboratories L.P. | Meals · 2025-08-26 | Nemluvio | $31 |
| Arcutis Biotherapeutics | Meals · 2025-08-22 | Zoryve | $11 |
| LEO Pharma | Meals · 2025-08-19 | Adbry | $22 |
| Incyte | Meals · 2025-08-05 | Opzelura | $29 |
| Galderma Laboratories L.P. | Meals · 2025-08-05 | Nemluvio | $21 |
| LEO Pharma | Meals · 2025-08-01 | Adbry | $13 |
| Arcutis Biotherapeutics | Meals · 2025-07-31 | Zoryve | $8 |
| Abbvie | Meals · 2025-07-30 | Skyrizi | $32 |
| Lilly USA | Meals · 2025-07-28 | Taltz | $29 |
| Organon | Meals · 2025-07-28 | None | $20 |
| Organon | Meals · 2025-07-24 | Vtama | $188 |
| Ucb | Meals · 2025-07-22 | Bimzelx | $30 |
| LEO Pharma | Meals · 2025-07-22 | Adbry | $19 |
| Regeneron Healthcare Solutions | Meals · 2025-07-21 | Libtayo | $14 |
| Organon | Meals · 2025-07-21 | None | $6 |
| Arcutis Biotherapeutics | Meals · 2025-07-21 | Zoryve | $5 |
| Incyte | Meals · 2025-07-15 | Opzelura | $2 |
| Incyte | Meals · 2025-07-14 | Opzelura | $20 |
| LEO Pharma | Meals · 2025-07-14 | Adbry | $24 |
| Abbvie | Meals · 2025-06-30 | Skyrizi | $11 |
| Arcutis Biotherapeutics | Meals · 2025-06-30 | Zoryve | $21 |
| Regeneron Healthcare Solutions | Meals · 2025-06-25 | Libtayo | $25 |
| Arcutis Biotherapeutics | Meals · 2025-06-23 | Zoryve | $9 |
| Lilly USA | Meals · 2025-06-16 | Taltz | $29 |
| Novartis Pharmaceuticals | Meals · 2025-06-16 | Cosentyx | $15 |
| Ucb | Meals · 2025-06-10 | Bimzelx | $16 |
| LEO Pharma | Meals · 2025-06-10 | Adbry | $20 |
| Incyte | Meals · 2025-06-05 | Opzelura | $13 |
| LEO Pharma | Meals · 2025-06-02 | Adbry | $12 |
| Abbvie | Meals · 2025-05-28 | Skyrizi | $28 |
| Arcutis Biotherapeutics | Meals · 2025-05-21 | Zoryve | $20 |
| Regeneron Healthcare Solutions | Meals · 2025-05-15 | Dupixent | $15 |
| LEO Pharma | Meals · 2025-05-09 | Adbry | $28 |
| Genzyme | Meals · 2025-05-07 | Dupixent | $77 |
| Incyte | Meals · 2025-05-06 | Opzelura | $27 |
| Pfizer | Meals · 2025-05-05 | Litfulo | $16 |
| Incyte | Meals · 2025-05-01 | Opzelura | $123 |
| Incyte | Meals · 2025-05-01 | Opzelura | $16 |
| Incyte | Meals · 2025-04-29 | Opzelura | $14 |
| Ucb | Meals · 2025-04-22 | Bimzelx | $33 |
| Pfizer | Meals · 2025-04-22 | Litfulo | $119 |
| LEO Pharma | Meals · 2025-04-18 | Adbry | $17 |
| Incyte | Meals · 2025-04-15 | Opzelura | $28 |
| Galderma Laboratories L.P. | Meals · 2025-04-15 | Nemluvio | $18 |
| Janssen Biotech | Meals · 2025-04-10 | Tremfya | $123 |
| Galderma Laboratories L.P. | Meals · 2025-04-10 | Nemluvio | $34 |
| Abbvie | Education · 2025-04-09 | Skyrizi | $10 |
| Abbvie | Meals · 2025-04-09 | Skyrizi | $18 |
| Lilly USA | Meals · 2025-04-07 | Taltz | $31 |
| Ucb | Meals · 2025-04-01 | Bimzelx | $36 |
| Lilly USA | Meals · 2025-03-31 | Taltz | $27 |
| LEO Pharma | Meals · 2025-03-27 | Adbry | $7 |
| Arcutis Biotherapeutics | Meals · 2025-03-10 | Zoryve | $28 |
| LEO Pharma | Meals · 2025-03-05 | Adbry | $10 |
| Arcutis Biotherapeutics | Meals · 2025-03-04 | Zoryve | $27 |
| Lilly USA | Meals · 2025-03-03 | Taltz | $25 |
| Pfizer | Meals · 2025-03-03 | Litfulo | $25 |
| Regeneron Healthcare Solutions | Meals · 2025-02-27 | Dupixent | $27 |
| Galderma Laboratories L.P. | Meals · 2025-02-26 | None | $21 |
| LEO Pharma | Meals · 2025-02-24 | Adbry | $20 |
| Organon | Meals · 2025-02-20 | Vtama | $199 |
| Galderma Laboratories L.P. | Meals · 2025-02-12 | None | $14 |
| Galderma Laboratories L.P. | Meals · 2025-02-11 | Nemluvio | $125 |
| Arcutis Biotherapeutics | Meals · 2025-02-10 | Zoryve | $22 |
| Galderma Laboratories L.P. | Meals · 2025-02-05 | Nemluvio | $109 |
| Novartis Pharmaceuticals | Meals · 2025-01-28 | None | $20 |
| Genzyme | Meals · 2025-01-23 | Dupixent | $45 |
| Genentech USA | Meals · 2025-01-16 | Xolair | $29 |
| Abbvie | Meals · 2025-01-13 | Skyrizi | $29 |
| LEO Pharma | Meals · 2025-01-10 | Adbry | $14 |
| Abbvie | Meals · 2025-01-09 | Rinvoq | $150 |
| Genzyme | Meals · 2025-01-09 | Dupixent | $14 |
| Janssen Biotech | Meals · 2025-01-06 | Tremfya | $29 |
See earlier years (2024, 2023, 2022, 2021)
2024: $5,092
| Abbvie | Skyrizi | $915 | 26 payments
|
| LEO Pharma | Adbry | $602 | 23 payments
|
| Janssen Biotech | Tremfya | $573 | 6 payments
|
| Genzyme | Dupixent | $558 | 13 payments
|
| Lilly USA | Olumiant | $484 | 8 payments
|
| Amgen | Otezla | $299 | 3 payments
|
| Regeneron Healthcare Solutions | Dupixent | $257 | 5 payments
|
| Dermavant Sciences | Vtama | $256 | 3 payments
|
| E.R. Squibb & Sons L.L.C. | Sotyktu | $252 | 6 payments
|
| Pfizer | Cibinqo | $245 | 3 payments
|
| Incyte | Opzelura | $200 | 4 payments
|
| Sun Pharmaceutical Industries | Ilumya | $186 | 6 payments
|
| Arcutis Biotherapeutics | Zoryve | $103 | 4 payments
|
| Ucb | Bimzelx | $94 | 4 payments
|
| Galderma Laboratories L.P. | None | $49 | 2 payments
|
| Organogenesis | None | $22 | 1 payment
|
2023: $2,888
| Abbvie | Skyrizi | $913 | 22 payments
|
| Janssen Biotech | Tremfya | $290 | 6 payments
|
| Dermavant Sciences | Vtama | $284 | 5 payments
|
| Amgen | Otezla | $262 | 7 payments
|
| Lilly USA | Taltz | $233 | 6 payments
|
| LEO Pharma | Adbry | $220 | 10 payments
|
| Sun Pharmaceutical Industries | Ilumya | $191 | 6 payments
|
| Incyte | Opzelura | $168 | 6 payments
|
| Arcutis Biotherapeutics | None | $134 | 2 payments
|
| E.R. Squibb & Sons L.L.C. | Sotyktu | $100 | 3 payments
|
| Genzyme | Fabrazyme | $35 | 1 payment
|
| Pfizer | Cibinqo | $21 | 1 payment
|
| Ortho Dermatologics a division of Bausch Health US | Jublia | $20 | 1 payment
|
| Novartis Pharmaceuticals | Xolair | $19 | 1 payment
|
2022: $406
| Abbvie | Skyrizi | $206 | 6 payments
|
| Janssen Biotech | Tremfya | $44 | 1 payment
|
| Novartis Pharmaceuticals | Xolair | $40 | 2 payments
|
| Genzyme | Dupixent | $29 | 1 payment
|
| LEO Pharma | Adbry | $26 | 1 payment
|
| Incyte | Opzelura | $23 | 1 payment
|
| E.R. Squibb & Sons L.L.C. | Sotyktu | $22 | 1 payment
|
| EPI Health | Cloderm | $16 | 1 payment
|
2021: $188
| AbbVie | Skyrizi | $188 | 4 payments
|
Professional record
- NPI
- 1891374963
- Licence
- CA 60110California A60110: Current · expires 2028-01-31
- Group
- Csi Medical Group
- Gender
- Female
More record details
- Sole proprietor
- No
- Taxonomy
- Physician assistant (363A00000X)
- Mailing address
- 525 South Dr Ste 115, Mountain View, CA, 94040
- NPI first listed
- 2021-04-06
- NPI last updated
- 2023-01-19
- NPI record certified
- 2023-01-19
This is when the NPI record was last certified, not a medical board exam.
Extra NPI addresses: 525 South Dr Ste 115, Mountain View, CA, 94040 · 3060 Broadway, Redwood City, CA, 94062 · 2420 Samaritan Dr, San Jose, CA, 95124 · 603 S Knickerbocker Dr, Sunnyvale, CA, 94087