Der-yi Li, LPCC, LMHC
Der-yi Li, LPCC, LMHC is a Counselor in Sunnyvale, CA, registered under NPI 1003363094. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Sunnyvale, based on OpenStreetMap data collected Sep 21, 2026. Parking is available about 0.33 mi away. The nearest transit stop is 762 ft away, served by South Mary Avenue & Cascade Drive. A pharmacy sits 513 ft from the entrance (Walgreens), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 876 ft away.
Getting here and what is nearby
Restaurant Saravanaa Bhavan 250 ft ~1 min
1305 South Mary Avenue
Mo-Fr 11:00-14:00,05:30-22:00; Sa,Su 11:00-15:00,05:30-22:00
Parking 419 ft ~2 min
Grocery Zanotto's Market Sunnyvale 444 ft ~2 min
1356 South Mary Avenue, Sunnyvale 94087
08:00-20:00
Restaurant The Gurkha Kitchen 498 ft ~2 min
1342 South Mary Avenue, Sunnyvale 94087
Mo-Su 11:00-00:00
Transit South Mary Avenue & West Fremont Avenue 530 ft ~3 min
Pharmacy Walgreens 513 ft ~2 min
Grocery New India Bazaar 511 ft ~2 min
Transit South Mary Avenue & Cascade Drive 706 ft ~3 min
Restaurant Country Gourmet 668 ft ~3 min
Transit South Mary Avenue & Cascade Drive 762 ft ~3 min
Gas station Westmoor Chevron 802 ft ~4 min
Convenience ampm 839 ft ~4 min
Convenience ExtraMile 862 ft ~4 min
Gas station Arco 869 ft ~4 min
860 West Fremont Avenue, Sunnyvale 94087
Coffee Starbucks 876 ft ~4 min
1291 South Mary Avenue, Sunnyvale 94087
Mo-Sa 05:00-20:00, Su 06:00-19:30
Parking 0.22 mi ~5 min
Grocery Smart & Final Extra! 0.22 mi ~5 min
1265 South Mary Avenue, Sunnyvale 94087
Mo-Su 07:00-21:00
Parking 0.33 mi ~7 min
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.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Counselor covers
A provider who is trained and educated in the performance of behavior health services through interpersonal communications and analysis. Training and education at the specialty level usually requires a master's degree and clinical experience and supervision for licensure or certification. NUCC Health Care Provider Taxonomy, code 101Y00000X
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 | 1003363094 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 7, 2016 |
| Last updated | Oct 20, 2023 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | LPCC, LMHC |
| Practice address |
1307 S MARY AVE STE 250 Sunnyvale, CA 94087 (650) 618-6434 |
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 | 6 | 3 | 0 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 6 | 6 | 0 | 9 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.