Crystal Tsai, MS, RD
Crystal Tsai, MS, RD is a Registered Dietitian in Palo Alto, CA, registered under NPI 1003448838. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Palo Alto, based on OpenStreetMap data collected Sep 1, 2026. Parking is available about 0.43 mi away at Palo Alto Unified School District Corporation Yard. There is EV charging 0.45 mi from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 871 ft away, served by El Camino Real & Embarcadero Road. A pharmacy sits 0.45 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 902 ft away.
Getting here and what is nearby
Transit Palo Alto Medical Foundation 496 ft ~2 min
Transit Palo Alto Medical Foundation 512 ft ~2 min
Hotel The Clement 508 ft ~2 min
711 El Camino Real
Hotel Westin Palo Alto 546 ft ~3 min
Restaurant Poké House 599 ft ~3 min
Restaurant Asian Box 607 ft ~3 min
Town and Country Village, Palo Alto 94301
Mo-Sa 10:30-21:00; Su 10:30-20:00
Restaurant Saint Michael’s Alley 637 ft ~3 min
Coffee Douce France 762 ft ~3 min
Coffee Boba Guys 815 ft ~4 min
855 El Camino Real, Palo Alto 94301
Mo-Sa 10:00-21:00; Su 11:00-19:00
Transit El Camino Real & Embarcadero Road 871 ft ~4 min
Coffee Peet's Coffee 902 ft ~4 min
Mo-Fr 05:00-19:00; Sa-Su 06:00-19:00
Pharmacy CVS Pharmacy 909 ft ~4 min
Mo-Fr 08:00-12:30,13:00-19:00; Sa 10:00-12:30,13:00-18:00; Su 11:00-12:30,13:00-17:00
Grocery Whole Foods Market 946 ft ~4 min
774 Emerson Street, Palo Alto 94301
Mo-Su 08:00-22:00
Grocery Trader Joe's 0.22 mi ~5 min
855 El Camino Real, Palo Alto 94301
Mo-Su 08:00-21:00
EV charging ChargePoint 0.23 mi ~5 min
Hotel Epiphany Hotel 0.25 mi ~5 min
180 Hamilton Avenue
Parking High/Alma South Garage (Lot R) 0.25 mi ~6 min
528 High Street
Grocery SOS Fine Foods 0.25 mi ~5 min
Parking High/Alma North Garage (Lot Q) 0.34 mi ~7 min
432-436 High Street
EV charging ChargePoint 0.40 mi ~8 min
Parking Palo Alto Unified School District Corporation Yard 0.43 mi ~9 min
85 Churchill Avenue, Palo Alto 94306
Gas station Palo Alto Unified School District Corporation Yard 0.44 mi ~9 min
Pharmacy Hoover Pharmacy 0.44 mi ~9 min
EV charging Tesla Supercharger 0.45 mi ~9 min
Pharmacy CVS Pharmacy 0.45 mi ~10 min
352 University Avenue, Palo Alto 94301
Mo-Sa 07:00-22:00; Su 08:00-22:00
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
- Status
- Approved
- Provider type
- Practitioner - Registered Dietitian Or Nutrition Professional
- PAC ID
- 9931511623
- Enrollment ID
- I20201222002596
Medicare enrolment is recorded as approved under the provider type Practitioner - Registered Dietitian Or Nutrition Professional. 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 Dietitian, Registered covers
A Registered Dietitian (RD)/Registered Dietitian Nutritionist (RDN) is an individual uniquely trained in the science of nutrition and practice of dietetics to design and provide medical nutrition therapy (MNT) and other evidence-based applications of the Nutrition Care Process (NCP) that exemplify the profession's systematic approach to providing high quality nutrition care. Registered dietitians provide MNT for the purpose of disease prevention or management, or to treat or rehabilitate an illness, injury, or condition, with the use of specific, indicated physical and cognitive nutrition care services comprised of one or more of the following aspects of the NCP: nutrition assessment/reassessment, nutrition diagnosis, nutrition intervention (e.g., nutrition counseling, therapeutic diet ordering, and nutrition education) and nutrition monitoring and evaluation. NUCC Health Care Provider Taxonomy, code 133V00000X
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 | |
|---|---|---|---|---|
| 133V00000X | Registered Dietitian | — | — | primary |
| 133VN1004X | Pediatric Nutrition Registered Dietitian Nutrition, Pediatric | — | — |
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 | 1003448838 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 10, 2020 |
| Last updated | Dec 18, 2020 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | MS, RD |
| Practice address |
795 EL CAMINO REAL Palo Alto, CA 94301 (650) 853-2961 |
| Mailing address |
325 DISTEL CIR Los Altos, CA 94022 |
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 | 4 | 4 | 8 | 8 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 4 | 7 | 8 | 6 |
Sum = 62 · next multiple of 10 = 70 · check digit = 8 · actual last digit = 8
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.