Seth Derrick
Seth Derrick is a Mental Health Counselor in Grass Valley, CA, registered under NPI 1003231473.
Getting there
Here is what surrounds this office in Grass Valley, based on OpenStreetMap data collected Sep 13, 2026. Parking is available about 853 ft away. There is EV charging 0.41 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 966 ft away. If you arrive early, there is a coffee shop 0.34 mi away.
Getting here and what is nearby
Gas station Shell 91 ft ~1 min
Parking 227 ft ~1 min
Parking 408 ft ~2 min
Gas station Quik Stop 640 ft ~3 min
Parking 853 ft ~4 min
Transit 966 ft ~4 min
Grocery Natural Selection 0.26 mi ~6 min
589 East Main Street, Grass Valley 95945
Mo-Su 08:00-20:00
Hotel Holiday Lodge 0.30 mi ~6 min
Coffee Durga's Divine Café 0.34 mi ~7 min
Restaurant Pine Street Burgers 0.35 mi ~7 min
1249 East Main Street, Grass Valley 95945
Mo-Su 11:00-20:00
Gas station Chevron 0.38 mi ~8 min
EV charging 0.41 mi ~9 min
Grocery BriarPatch Food Co-Op 0.49 mi ~10 min
290 Sierra College Drive, Grass Valley 95945
07:00-22:00
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.
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 Mental Health covers
Definition to come... NUCC Health Care Provider Taxonomy, code 101YM0800X
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 | 1003231473 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 21, 2014 |
| Last updated | Jun 7, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Practice address |
900 E MAIN ST STE 201 Grass Valley, CA 95945 (530) 802-6993 |
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 | 3 | 1 | 4 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 3 | 2 | 4 | 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.