Chelsea Thomsen, M.D., M.S.P.H
Chelsea Thomsen, M.D., M.S.P.H is an Internal Medicine Physician in San Francisco, CA, registered under NPI 1003227927.
Getting there
Here is what surrounds this office in San Francisco, based on OpenStreetMap data collected Sep 12, 2026. Parking is available about 459 ft away. The nearest transit stop is 132 ft away, served by West Portal Avenue & Ulloa Street. A pharmacy sits 954 ft from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.31 mi away.
Getting here and what is nearby
Transit Ulloa Street & West Portal Avenue 38 ft ~1 min
Restaurant Proposition Chicken 50 ft ~1 min
16 West Portal Avenue, San Francisco 94127
11:00-21:05; Jul 04 11:00-17:00
Transit Ulloa Street & Lenox Way 123 ft ~1 min
Transit West Portal Avenue & Ulloa Street 132 ft ~1 min
Restaurant Franco's Latin Table 94 ft ~1 min
24 West Portal Avenue, San Francisco 94127
Convenience West Portal Daily 162 ft ~1 min
36 West Portal Avenue, San Francisco 94127
Convenience Eezy Freezy 167 ft ~1 min
Coffee Peet's Coffee 236 ft ~1 min
54 West Portal Avenue, San Francisco 94127
Restaurant Spiazzo 186 ft ~1 min
33 West Portal Avenue, San Francisco 94127
Gas station Beacon 289 ft ~2 min
Parking 281 ft ~2 min
Gas station Valero 424 ft ~2 min
Parking 426 ft ~2 min
Parking 459 ft ~2 min
Coffee Starbucks 535 ft ~3 min
Pharmacy Walgreens 954 ft ~4 min
200 West Portal Avenue, San Francisco 94127
Mo-Sa 07:00-22:00; Su 08:00-22:00
Coffee Greenhouse 0.31 mi ~7 min
329 West Portal Avenue, San Francisco 94127
Mo-Fr 07:00-19:00; Sa,Su 08:00-19:00
Grocery Parkside Farmers Market 0.36 mi ~8 min
555 Taraval Street, San Francisco 94116
Mo-Sa 07:00-19:00; Su 07:00-18:00
Grocery Safeway 0.47 mi ~10 min
730 Taraval Street, San Francisco 94116
06:00-24:00
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 50576 | AZ | Internal Medicine Physician |
| A170520 | CA | Internal Medicine Physician primary |
Licences are recorded in 2 states: AZ, CA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Internal Medicine
- PAC ID
- 7810116662
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Arizona | I20171024000250 | Practitioner - Internal Medicine |
| California | I20211213001196 | Practitioner - Internal Medicine |
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. There are 2 separate enrolment records across 2 states (AZ, CA). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: Arizona and California. The practice address on file is in San Francisco, CA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- A170520
- Specialty
- Internal Medicine Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Internal Medicine covers
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs. NUCC Health Care Provider Taxonomy, code 207R00000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | 50576 | AZ | |
| 207R00000X | Internal Medicine Physician | A170520 | CA | primary |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003227927 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 13, 2014 |
| Last updated | Mar 14, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | M.D., M.S.P.H |
| Practice address |
2 W PORTAL AVE San Francisco, CA 94127 (415) 291-0480 Fax (415) 252-7176 |
| Mailing address |
1 EMBARCADERO CTR STE 1900 San Francisco, CA 94111 |
| Other names |
Chelsea Mcgarvey Former Legal Business Name |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 2 | 2 | 7 | 9 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 2 | 5 | 9 | 4 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.