Stefan Lowenstein, MD
Dermatology · Mill Valley
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 28
- 6 carriers
- Offices
- 2
- Since medical school
- 8 years
- University of California, San Francisco School of Medicine, 2018
Offices
2 locations · Aesthetic Dermatology and Cosmetic Surgery Medical Associates Inc · Union Square Dermatology A Professional Corporation
Looking this up.
Plans that list them
28 plans · 6 carriers
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Lowenstein’s office to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
28 of 28 plans
| Alignment Health BreathEasy (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Clarity (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Harmony (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes CalPlus (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes Care (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Heart & Diabetes Choice (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Honor+ Plan (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health My Choice CalCare (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Silicon (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health smartHMO (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health the ONE (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Astiva Health C-SNP WOW - NorCal (HMO C-SNP) | Astiva Health | Listed | Oct 29, 2026 |
| Astiva Health Premier Plan - NorCal (HMO) | Astiva Health | Listed | Oct 29, 2026 |
| Astiva Health Savings Plan - NorCal (HMO) | Astiva Health | Listed | Oct 29, 2026 |
| Blue Shield Inspire (HMO) | Blue Shield of California | Listed | Aug 26, 2026 |
| Central Health Classic Care Plan III (HMO) | Central Health Medicare Plan | Listed | Aug 15, 2026 |
| Central Health Dual Access Plan (HMO D-SNP) | Central Health Medicare Plan | Listed | Aug 15, 2026 |
| Central Health Embrace Care Plan (HMO C-SNP) | Central Health Medicare Plan | Listed, may be out of date | Sep 15, 2025 |
| Central Health Embrace Choice Plan (HMO C-SNP) | Central Health Medicare Plan | Listed | Aug 15, 2026 |
| Central Health Valor Care Plan (HMO) | Central Health Medicare Plan | Listed | Aug 15, 2026 |
| Imperial Courage Plan (HMO) | Imperial Health Plan of California, Inc. | Listed | Sep 1, 2026 |
| Imperial Dynamic Plan (HMO) | Imperial Health Plan of California, Inc. | Listed | Sep 1, 2026 |
| Imperial Senior Value (HMO C-SNP) | Imperial Health Plan of California, Inc. | Listed | Sep 1, 2026 |
| SCAN Balance (HMO C-SNP) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN Classic (HMO) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN MyChoice (HMO) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN Strive (HMO C-SNP) | SCAN Health Plan | Listed | Oct 3, 2026 |
California Medical Board record
Licence A165056 · Current
Licensed to practise in California · since 2019 · expires 2027-09-30 · University of California San Francisco School of Medicine.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
School, training and certification
What this clinician told their state board, medical school and everything before it. Only some states publish this, so nothing here means the state does not say, not that there was no training or certification.
Specialty certification
- American Board of Dermatology - Dermatology
Original Medicare doctor bills
$243,596
Medicare paid this office $243,596 for 672 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Short return visit (20+ min) | 375 | $39,435 | $78 |
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks | 40 | $26,070 | $567 |
| Biopsy of related skin growth, first growth | 230 | $24,156 | $90 |
| Destruction of precancer skin growth, 1 growth | 310 | $23,232 | $54 |
| Return visit (30+ min) | 114 | $14,972 | $107 |
See all 20 services
| Short return visit (20+ min) | 375 | $39,435 | $78 |
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks | 40 | $26,070 | $567 |
| Biopsy of related skin growth, first growth | 230 | $24,156 | $90 |
| Destruction of precancer skin growth, 1 growth | 310 | $23,232 | $54 |
| Return visit (30+ min) | 114 | $14,972 | $107 |
| Complicated repair of wound of scalp, arms, or legs, 2.6-7.5 cm | 30 | $12,546 | $405 |
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks | 18 | $10,532 | $421 |
| Destruction of skin growth, 1-14 growths | 69 | $8,773 | $111 |
| Complicated repair of wound of forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet, 2.6-7.5 cm | 27 | $7,708 | $275 |
| Destruction of precancer skin growth, 2-14 growths | 237 | $7,083 | $7 |
| Short return visit | 114 | $6,776 | $53 |
| New patient visit (30+ min) | 69 | $6,157 | $89 |
| Removal of cancer skin growth of body, arms, or legs, 2.1-3.0 cm | 23 | $3,330 | $139 |
| Biopsy of related skin growth, each additional growth | 46 | $2,842 | $49 |
| New patient visit (45+ min) | 20 | $2,732 | $137 |
| Punch biopsy, first skin growth | 16 | $1,878 | $110 |
| New patient visit (15+ min) | 26 | $1,633 | $63 |
| Removal of cancer skin growth of body, arms, or legs, 1.1-2.0 cm | 12 | $1,600 | $133 |
| Injection into skin growth, 1-7 growths | 18 | $954 | $45 |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | 18 | $20 | None |
Procedures Medicare counted
| Melanoma (skin cancer) excision | 118 | More than 94% of doctors who do this |
| Removal of skin cancer | 273 | More than 41% of doctors who do this |
| Removal of skin lesions | 1640 | More than 97% of doctors who do this |
| Removal or shaving of skin growth | 1-10 | None |
| Skin biopsy | 633 | More than 97% of doctors who do this |
Procedures year by year
| Procedure | 2022 | 2023 | 2024 |
|---|---|---|---|
| Destruction of precancer skin growth, 2-14 growths | 336 | 1,197 | 1,029 |
| Destruction of precancer skin growth, 1 growth | 96 | 403 | 434 |
| Biopsy of related skin growth, first growth | 62 | 295 | 269 |
| Destruction of skin growth, 1-14 growths | 38 | 78 | 79 |
| Biopsy of related skin growth, each additional growth | – | 77 | 58 |
| Injection into skin growth, 1-7 growths | 17 | 54 | 21 |
Times billed to Original Medicare each year. A blank year means fewer than 11 people had it, or none: Medicare does not publish smaller counts. Medicare Advantage patients are not included.
Who their Medicare patients are
672 Original Medicare patients in 2024. Average age 77 · Under 65 3% · 85 and older 18% · Women 55% · Also on Medicaid 7% · Health risk score 0.93. At or below the middle of the specialty; the typical dermatology clinician is at 1.01.
Conditions among them: High blood pressure 55% · Coronary heart disease 21% · Chronic kidney disease 16% · Cancer 15% · Depression 15% · Diabetes 13% · Atrial fibrillation 13% · COPD 9% · Heart failure 8% · Stroke 7% · Dementia 3%.
The office billed $593,003, Medicare allowed $322,605 and paid $243,596; for 3,174 services of 71 kinds; $2,192 of it was for drugs given in the office and $241,404 for care.
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 | 672 | 3,174 | 77 | 0.93 | $593,003 | $243,596 |
| 2023 | 567 | 3,412 | 78 | 0.92 | $545,747 | $230,801 |
| 2022 | 238 | 932 | 77 | 0.92 | $125,497 | $57,034 |
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: 19 services
| Short return visit (20+ min) | 378 | $43,593 | $73 |
| Biopsy of related skin growth, first growth | 225 | $27,074 | $92 |
| Destruction of precancer skin growth, 1 growth | 281 | $19,487 | $48 |
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks | 32 | $17,910 | $543 |
| Complicated repair of wound of scalp, arms, or legs, 2.6-7.5 cm | 35 | $14,913 | $382 |
| Return visit (30+ min) | 91 | $11,156 | $102 |
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks | 18 | $10,668 | $395 |
| Destruction of skin growth, 1-14 growths | 68 | $8,068 | $103 |
| Destruction of precancer skin growth, 2-14 growths | 211 | $7,912 | $7 |
| Complicated repair of wound of forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet, 2.6-7.5 cm | 22 | $6,271 | $273 |
| New patient visit (30+ min) | 73 | $6,161 | $84 |
| Biopsy of related skin growth, each additional growth | 52 | $3,944 | $51 |
| Destruction of cancer skin growth of trunk, arms, or legs, 1.1-2.0 cm | 14 | $3,130 | $157 |
| Removal of cancer skin growth of body, arms, or legs, 2.1-3.0 cm | 21 | $2,918 | $133 |
| Injection into skin growth, 1-7 growths | 37 | $2,393 | $44 |
| Destruction of precancer skin growth, 15 or more growths | 12 | $2,390 | $171 |
| Short return visit | 47 | $2,366 | $48 |
| Removal of cancer skin growth of body, arms, or legs, 1.1-2.0 cm | 17 | $2,302 | $121 |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | 36 | $104 | None |
2022: 10 services
| Short return visit (20+ min) | 130 | $13,777 | $82 |
| Biopsy of related skin growth, first growth | 58 | $5,703 | $92 |
| Destruction of precancer skin growth, 1 growth | 85 | $5,074 | $53 |
| Destruction of skin growth, 1-14 growths | 36 | $4,151 | $109 |
| New patient visit (30+ min) | 36 | $3,254 | $90 |
| Return visit (30+ min) | 21 | $2,529 | $115 |
| Destruction of precancer skin growth, 2-14 growths | 62 | $2,183 | $6 |
| Short return visit | 30 | $1,653 | $52 |
| Injection into skin growth, 1-7 growths | 15 | $699 | $41 |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | 15 | $16 | None |
Drugs they prescribed that Part D paid
$59,929
Pharmacies billed $59,929 in 2024.
This is pharmacy cost, not the office bill, and not what patients paid.
532 generic and 18 brand-name prescriptions · $59,929 in drug cost · 65 antibiotic prescriptions to 49 people.
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.
| Fluorouracil | 30 | $1,888 | $63 |
| Ketoconazole | 74 | $1,588 | $21 |
| Tretinoin | 21 | $1,328 | $63 |
| Clobetasol Propionate | 28 | $1,232 | $44 |
| Metronidazole | 18 | $1,183 | $66 |
See all 14 drugs
| Fluorouracil | 30 | $1,888 | $63 |
| Ketoconazole | 74 | $1,588 | $21 |
| Tretinoin | 21 | $1,328 | $63 |
| Clobetasol Propionate | 28 | $1,232 | $44 |
| Metronidazole | 18 | $1,183 | $66 |
| Doxycycline Hyclate | 56 | $783 | $14 |
| Triamcinolone Acetonide | 70 | $624 | $9 |
| Fluocinonide | 15 | $464 | $31 |
| Hydrocortisone | 55 | $437 | $8 |
| Minoxidil | 35 | $368 | $11 |
| Clindamycin Phosphate | 14 | $332 | $24 |
| Valacyclovir | 11 | $281 | $26 |
| Permethrin | 12 | $255 | $21 |
| Prednisone | 11 | $67 | $6 |
Year by year
| 2024 | 550 | 273 | None | 3% | $59,929 |
| 2023 | 379 | 182 | None | 8% | $92,005 |
| 2022 | 223 | 96 | 0% (0) | 11% | $264,002 |
| 2021 | 149 | 57 | 0% (0) | None | $86,513 |
| 2020 | 11 | None | 0% (0) | None | $703 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 12 drugs
| Otezla | 11 | $49,105 | $4,464 |
| Fluorouracil | 25 | $2,850 | $114 |
| Tretinoin | 14 | $1,558 | $111 |
| Clobetasol Propionate | 24 | $1,240 | $52 |
| Clindamycin Phosphate | 16 | $1,141 | $71 |
| Ketoconazole | 34 | $902 | $27 |
| Triamcinolone Acetonide | 50 | $569 | $11 |
| Doxycycline Hyclate | 27 | $500 | $19 |
| Minoxidil | 31 | $461 | $15 |
| Hydrocortisone | 37 | $364 | $10 |
| Valacyclovir | 12 | $308 | $26 |
| Gabapentin | 11 | $120 | $11 |
2022: 6 drugs
| Clobetasol Propionate | 14 | $947 | $68 |
| Ketoconazole | 15 | $587 | $39 |
| Methotrexate | 14 | $566 | $40 |
| Triamcinolone Acetonide | 33 | $352 | $11 |
| Prednisone | 23 | $315 | $14 |
| Hydrocortisone | 24 | $107 | $4 |
2021: 4 drugs
| Fluocinonide | 15 | $1,272 | $85 |
| Methotrexate | 17 | $655 | $39 |
| Triamcinolone Acetonide | 12 | $618 | $51 |
| Prednisone | 23 | $480 | $21 |
Money from drug and device companies
$1,535 in 2025
| 2025 | 16 | 65 | None | $1,535 |
| 2024 | 15 | 87 | None | $2,027 |
| 2023 | 11 | 89 | None | $1,733 |
| 2022 | 8 | 21 | None | $426 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| LEO Pharma | Adbry | $443 | 24 payments
|
| Galderma Laboratories L.P. | Nemluvio | $225 | 5 payments
|
| Ucb | Bimzelx | $211 | 5 payments
|
| Pfizer | Cibinqo | $115 | 5 payments
|
| Abbvie | Skyrizi | $95 | 5 payments
|
| Janssen Biotech | Tremfya | $84 | 4 payments
|
See all 65 published payments
| LEO Pharma | Meals · 2025-12-23 | Adbry | $10 |
| LEO Pharma | Meals · 2025-12-03 | Adbry | $22 |
| LEO Pharma | Meals · 2025-12-03 | Adbry | $22 |
| Botanix SB | Meals · 2025-11-25 | Sofdra | $20 |
| LEO Pharma | Meals · 2025-11-06 | Adbry | $20 |
| Ucb | Meals · 2025-11-03 | Bimzelx | $28 |
| LEO Pharma | Meals · 2025-10-23 | Adbry | $20 |
| Biofrontera | Meals · 2025-10-22 | None | $17 |
| Incyte | Meals · 2025-10-21 | Opzelura | $24 |
| Arcutis Biotherapeutics | Meals · 2025-10-06 | Zoryve | $25 |
| Pfizer | Meals · 2025-09-30 | Cibinqo | $17 |
| Galderma Laboratories L.P. | Meals · 2025-09-26 | Nemluvio | $13 |
| LEO Pharma | Meals · 2025-09-09 | Adbry | $19 |
| LEO Pharma | Meals · 2025-08-27 | Adbry | $6 |
| LEO Pharma | Meals · 2025-08-15 | Adbry | $15 |
| Galderma Laboratories L.P. | Meals · 2025-08-07 | Nemluvio | $81 |
| LEO Pharma | Meals · 2025-08-05 | Adbry | $19 |
| Merz North America | Meals · 2025-08-04 | Xeomin | $24 |
| Regeneron Healthcare Solutions | Meals · 2025-08-01 | Libtayo | $28 |
| Ucb | Meals · 2025-07-25 | Bimzelx | $21 |
| LEO Pharma | Meals · 2025-07-22 | Adbry | $20 |
| LEO Pharma | Meals · 2025-07-15 | Adbry | $22 |
| Pfizer | Meals · 2025-07-14 | Cibinqo | $22 |
| Abbvie | Meals · 2025-07-11 | Skyrizi | $17 |
| Abbvie | Meals · 2025-07-01 | Skyrizi | $24 |
| LEO Pharma | Meals · 2025-07-01 | Adbry | $19 |
| LEO Pharma | Meals · 2025-06-24 | Adbry | $21 |
| Pfizer | Meals · 2025-06-23 | Cibinqo | $23 |
| LEO Pharma | Meals · 2025-06-12 | Adbry | $13 |
| Ucb | Meals · 2025-06-04 | Bimzelx | $125 |
| Ucb | Meals · 2025-06-03 | Bimzelx | $9 |
| LEO Pharma | Meals · 2025-06-03 | Adbry | $12 |
| LEO Pharma | Meals · 2025-05-30 | Adbry | $23 |
| Verrica Pharmaceuticals | Meals · 2025-05-28 | Ycanth | $24 |
| LEO Pharma | Meals · 2025-05-21 | Adbry | $12 |
| Regeneron Healthcare Solutions | Meals · 2025-05-19 | Libtayo | $17 |
| Novartis Pharmaceuticals | Meals · 2025-05-15 | Cosentyx | $29 |
| Pfizer | Meals · 2025-05-12 | Cibinqo | $25 |
| Abbvie | Meals · 2025-05-07 | Botox | $21 |
| Ucb | Meals · 2025-04-28 | Bimzelx | $30 |
| Regeneron Healthcare Solutions | Meals · 2025-04-15 | Dupixent | $14 |
| Incyte | Meals · 2025-04-12 | Opzelura | $14 |
| Galderma Laboratories L.P. | Meals · 2025-04-08 | Nemluvio | $76 |
| Galderma Laboratories L.P. | Meals · 2025-04-04 | Nemluvio | $30 |
| LEO Pharma | Meals · 2025-03-27 | Adbry | $15 |
| Galderma Laboratories L.P. | Meals · 2025-03-22 | Nemluvio | $24 |
| Lilly USA | Meals · 2025-03-20 | Taltz | $24 |
| Biofrontera | Meals · 2025-03-13 | None | $24 |
| Organon | Meals · 2025-03-12 | Vtama | $15 |
| LEO Pharma | Meals · 2025-02-28 | Adbry | $23 |
| LEO Pharma | Meals · 2025-02-21 | Adbry | $20 |
| Abbvie | Meals · 2025-02-20 | Skyrizi | $19 |
| Janssen Biotech | Meals · 2025-02-13 | Tremfya | $20 |
| Janssen Biotech | Meals · 2025-02-07 | Tremfya | $29 |
| Lilly USA | Meals · 2025-02-05 | Taltz | $28 |
| Incyte | Meals · 2025-01-31 | Opzelura | $17 |
| LEO Pharma | Meals · 2025-01-30 | Adbry | $25 |
| Lilly USA | Meals · 2025-01-28 | Taltz | $18 |
| LEO Pharma | Meals · 2025-01-24 | Adbry | $17 |
| Janssen Biotech | Meals · 2025-01-23 | Tremfya | $16 |
| Pfizer | Meals · 2025-01-23 | Cibinqo | $28 |
| Janssen Biotech | Meals · 2025-01-17 | Tremfya | $19 |
| LEO Pharma | Meals · 2025-01-17 | Adbry | $21 |
| Abbvie | Meals · 2025-01-09 | Skyrizi | $15 |
| LEO Pharma | Meals · 2025-01-09 | Adbry | $27 |
See earlier years (2024, 2023, 2022)
2024: $2,027
| Abbvie | Skyrizi | $672 | 30 payments
|
| LEO Pharma | Adbry | $580 | 28 payments
|
| Pfizer | Cibinqo | $305 | 13 payments
|
| Boehringer Ingelheim Pharmaceuticals | Spevigo | $78 | 1 payment
|
| Sun Pharmaceutical Industries | Ilumya | $70 | 2 payments
|
| Regeneron Healthcare Solutions | Dupixent | $60 | 2 payments
|
| E.R. Squibb & Sons L.L.C. | Sotyktu | $44 | 2 payments
|
| Organogenesis | None | $44 | 2 payments
|
| Janssen Biotech | Tremfya | $37 | 1 payment
|
| Biofrontera | Ameluz | $28 | 1 payment
|
| Genzyme | Dupixent | $26 | 1 payment
|
| Merz North America | Xeomin | $24 | 1 payment
|
| Ucb | Bimzelx | $23 | 1 payment
|
| Arcutis Biotherapeutics | Zoryve | $17 | 1 payment
|
| Amgen | Otezla | $17 | 1 payment
|
2023: $1,733
| LEO Pharma | Adbry | $619 | 35 payments
|
| Abbvie | Skyrizi | $429 | 21 payments
|
| Pfizer | Cibinqo | $250 | 14 payments
|
| Amgen | Otezla | $152 | 5 payments
|
| Lilly USA | Taltz | $86 | 4 payments
|
| Novartis Pharmaceuticals | Xolair | $57 | 3 payments
|
| Regeneron Healthcare Solutions | Dupixent | $51 | 3 payments
|
| Boehringer Ingelheim Pharmaceuticals | Cyltezo | $34 | 1 payment
|
| Janssen Biotech | Remicade | $27 | 1 payment
|
| Galderma Laboratories L.P. | Dysport | $14 | 1 payment
|
| Sun Pharmaceutical Industries | Winlevi | $14 | 1 payment
|
2022: $426
| LEO Pharma | Adbry | $188 | 11 payments
|
| Janssen Biotech | Remicade | $50 | 2 payments
|
| Genzyme | Dupixent | $49 | 2 payments
|
| Abbvie | Skyrizi | $48 | 2 payments
|
| Janssen Scientific Affairs | Tremfya | $34 | 1 payment
|
| Incyte | Opzelura | $27 | 1 payment
|
| Galderma Laboratories L.P. | None | $17 | 1 payment
|
| Merz North America | None | $14 | 1 payment
|
Professional record
- NPI
- 1245728807
- Licence
- CA A165056California A165056: Current · expires 2027-09-30
- Trained
- University of California, San Francisco School of Medicine, 2018 · 8 years ago
- Group
- Aesthetic Dermatology and Cosmetic Surgery Medical Associates Inc · Union Square Dermatology A Professional Corporation
- Gender
- Male
More record details
- Sole proprietor
- Yes
- Taxonomy
- Federal specialty code 207N00000X (207N00000X); Federal specialty code 207ND0101X (207ND0101X); Federal specialty code 207ZD0900X (207ZD0900X); Student in a training program (390200000X)
- Mailing address
- 535 Miller Ave, Mill Valley, CA, 94941
- NPI first listed
- 2018-04-28
- NPI last updated
- 2026-04-23
- NPI record certified
- 2026-04-23
This is when the NPI record was last certified, not a medical board exam.