Maren Trotter, ASW
Maren Trotter, ASW is a Mental Health Counselor in San Leandro, CA, registered under NPI 1003421041.
Getting there
Here is what surrounds this office in San Leandro, based on OpenStreetMap data collected Sep 25, 2026. Parking is available about 0.37 mi away. The nearest transit stop is 536 ft away, served by Estudillo Avenue & Santa Maria Street. A pharmacy sits 0.30 mi from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.29 mi away.
Getting here and what is nearby
Transit Estudillo Avenue & Santa Rosa Street 65 ft ~1 min
Transit Estudillo Avenue & Santa Rosa Street 150 ft ~1 min
Transit Estudillo Avenue & Santa Maria Street 536 ft ~3 min
Pharmacy CVS Pharmacy 1,029 ft ~4 min
Coffee Peet's Coffee 0.21 mi ~5 min
1500 East 14th Street, San Leandro 94577
Gas station Shell 0.21 mi ~5 min
Restaurant The Habit Burger Grill 0.22 mi ~5 min
1540 East 14th Street, San Leandro 94577
Mo-Su 10:00-22:30
Restaurant Chipotle 0.22 mi ~5 min
Restaurant Le Soleil Vietnamese Noodles & Grill 0.23 mi ~5 min
1515 East 14th Street, San Leandro 94577
Mo-Fr 11:00-20:30 Sa 11:00-21:00
Grocery Sprouts Farmers Market 0.26 mi ~6 min
Coffee iTea 0.27 mi ~6 min
177 Pelton Center Way
Mo-Th 11:30-22:00; Fr-Su 11:30-23:00
Convenience Blaze N' Max 0.28 mi ~6 min
169 Pelton Center Way, San Leandro 94577
Mo-Sa 08:30-20:30 Su 09:00-20:00
Coffee 85°C 0.29 mi ~6 min
Parking 0.29 mi ~6 min
1598 Washington Avenue, San Leandro 94577
Pharmacy CVS Pharmacy 0.30 mi ~6 min
Grocery Safeway 0.31 mi ~7 min
1499 Washington Avenue, San Leandro 94577
06:00-24:00
Parking 0.35 mi ~7 min
1692 Washington Avenue, San Leandro 94577
Convenience Downtown Auto Repair 0.36 mi ~8 min
1495 Hays Street
Parking 0.37 mi ~8 min
277 Parrott Street, San Leandro 94577
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 |
|---|---|---|
| ASW97431 | CA | Mental Health Counselor primary |
This provider holds licence ASW97431 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
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 | 1003421041 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 15, 2020 |
| Last updated | Mar 8, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | ASW |
| Practice address |
400 ESTUDILLO AVE STE 100 San Leandro, CA 94577 (510) 352-9200 |
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 | 2 | 1 | 0 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 2 | 2 | 0 | 8 |
Sum = 49 · next multiple of 10 = 50 · check digit = 1 · actual last digit = 1
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.