Tiffany Chen, MD
Tiffany Chen, MD is a Pediatric Ophthalmology and Strabismus Specialist Physician in San Francisco, CA, registered under NPI 1003310673.
Getting there
Here is what surrounds this office in San Francisco, based on OpenStreetMap data collected Sep 17, 2026. Parking is available about 0.30 mi away at 1670 Owens Garage. The nearest transit stop is 595 ft away, served by 3rd Street & Mariposa Street. A pharmacy sits 0.36 mi from the entrance (Kaiser Mission Bay Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.23 mi away.
Getting here and what is nearby
Transit 16th Street & 4th Street 445 ft ~2 min
Transit 3rd Street & Mariposa Street 490 ft ~2 min
Transit 3rd Street & Mariposa Street 595 ft ~3 min
Coffee Philz Coffee 655 ft ~3 min
Mo-Fr 05:30-17:30; Sa,Su 07:00-17:30
Pharmacy Walgreens 631 ft ~3 min
Mo-Fr 09:00-18:00; Sa-Su 09:00-15:00
Restaurant SF Kebab 614 ft ~3 min
550 16th Street, San Francisco
Mo-Sa 11:00-22:00; Su 11:00-21:00; PH closed
Restaurant Dumpling Time Thrive City 771 ft ~3 min
Restaurant Mission Rock Resort 920 ft ~4 min
817 Terry A. Francois Boulevard, San Francisco 94158
11:30 - 23:00
Parking Third Street Garage 971 ft ~4 min
1650 3rd Street, San Francisco 94158
Coffee Noe Cafe - Dogpatch 1,025 ft ~4 min
Coffee The Pub 0.23 mi ~5 min
1675 Owens Street, San Francisco 94143
Parking 450 South Street Garage 0.27 mi ~6 min
150 Warriors Way
Parking 1670 Owens Garage 0.30 mi ~6 min
1670 Owens Street, San Francisco
Convenience Jim's Smoke Shop & Deli 0.36 mi ~8 min
Pharmacy Kaiser Mission Bay Pharmacy 0.36 mi ~8 min
Convenience New Potrero Market 0.39 mi ~8 min
1301 18th Street, San Francisco 94107
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 |
|---|---|---|
| 291481 | MA | Pediatric Ophthalmology and Strabismus… primary |
This provider holds licence 291481 issued in MA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Ophthalmology
- PAC ID
- 3678986478
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Massachusetts | I20220520002273 | Practitioner - Ophthalmology |
| California | I20231026002543 | Practitioner - Ophthalmology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Ophthalmology. There are 2 separate enrolment records across 2 states (MA, 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.
What Pediatric Ophthalmology and Strabismus Specialist covers
An ophthalmologist who specializes in pediatric ophthalmology and strabismus management. The subspecialty includes the medical and surgical management of eye disorders found in children. Some of the more common disorders include amblyopia, strabismus, refractive error, cataract and glaucoma. These disorders may be related to neurological and endocrinological diseases, trauma, or aging changes in the extraocular muscles requiring medical, optical and surgical management. NUCC Health Care Provider Taxonomy, code 207WX0110X
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 | 1003310673 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 20, 2018 |
| Last updated | Nov 2, 2023 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | MD |
| Practice address |
1825 4TH ST FL 5 San Francisco, CA 94143 (415) 353-2800 |
| Mailing address |
490 ILLINOIS ST FL 5 San Francisco, CA 94143 |
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 | 3 | 1 | 0 | 6 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 1 | 0 | 6 | 5 |
Sum = 47 · next multiple of 10 = 50 · check digit = 3 · actual last digit = 3
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.