Leah Daffner, ASW
Leah Daffner, ASW is a provider specialising in Clinical Social Worker in Oakland, CA, registered under NPI 1003535949.
Getting there
Here is what surrounds this office in Oakland, based on OpenStreetMap data collected Oct 4, 2026. Parking is available about 773 ft away. The nearest transit stop is 687 ft away, served by 106th Avenue & MacArthur Boulevard.
Getting here and what is nearby
Restaurant Carl's Jr. 92 ft ~1 min
Restaurant Happy Donuts 106 ft ~1 min
Transit MacArthur Boulevard & 109th Avenue 174 ft ~1 min
Restaurant Aqua Fresh Fish and Chips 135 ft ~1 min
Transit MacArthur Boulevard & 108th Avenue 245 ft ~1 min
Parking 323 ft ~2 min
Parking 550 ft ~3 min
Convenience ampm 610 ft ~3 min
Gas station Arco 620 ft ~3 min
Transit 106th Avenue & MacArthur Boulevard 687 ft ~3 min
Grocery Foods Co 738 ft ~3 min
Parking 773 ft ~3 min
Hotel Harris Motel 1,029 ft ~4 min
Hotel Commodore Motel 0.34 mi ~7 min
Hotel Premier Inn & Suites 0.42 mi ~9 min
Convenience Lucky Stop Market 0.44 mi ~9 min
Grocery Safeway 0.52 mi ~11 min
555 Bancroft Avenue, San Leandro 94577
06:00-24:00
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 |
|---|---|---|
| ASW109842 | CA | Clinical Social Worker primary |
This provider holds licence ASW109842 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 Clinical covers
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances. NUCC Health Care Provider Taxonomy, code 1041C0700X
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 | 1003535949 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 24, 2022 |
| Last updated | Aug 25, 2023 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | ASW |
| Practice address |
10700 MACARTHUR BLVD Oakland, CA 94605 (510) 853-3668 |
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 | 5 | 3 | 5 | 9 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 3 | 1 | 9 | 8 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.