Alexandra Mendez, PSY.D.
Alexandra Mendez, PSY.D. is a Clinical Psychologist in Fontana, CA, registered under NPI 1003584418. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. 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 Fontana, based on OpenStreetMap data collected Oct 8, 2026. Parking is available about 1,018 ft away. The nearest transit stop is 0.47 mi away, served by Sierra Lakes Parkway @ Augusta Eastbound. A pharmacy sits 49 ft from the entrance (Sierra San Antonio Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.44 mi away.
Getting here and what is nearby
Parking 35 ft ~1 min
Pharmacy Sierra San Antonio Pharmacy 49 ft ~1 min
16465 Sierra Lakes Parkway, Fontana
Parking 823 ft ~4 min
Parking 1,018 ft ~4 min
Restaurant Carl's Jr. 0.20 mi ~5 min
Transit Sierra Lakes Parkway @ Tiburon Eastbound 0.22 mi ~5 min
Coffee Starbucks 0.24 mi ~5 min
Restaurant Chipotle 0.24 mi ~5 min
Gas station Costco Gasoline 0.25 mi ~6 min
Grocery Ralphs 0.29 mi ~6 min
16225 Sierra Lakes Parkway, Fontana 92336
Mo-Su 05:00-01:00
Coffee Starbucks 0.30 mi ~7 min
Grocery Amazon Fresh 0.35 mi ~8 min
Restaurant Popeyes 0.36 mi ~8 min
16205 Sierra Lakes Parkway, Fontana 92336
10:00-22:00
Transit Sierra Lakes Parkway @ Citrus Eastbound 0.44 mi ~9 min
Coffee Starbucks 0.44 mi ~9 min
Transit Sierra Lakes Parkway @ Augusta Eastbound 0.47 mi ~10 min
Gas station Arco 0.48 mi ~10 min
Convenience ampm 0.49 mi ~10 min
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 |
|---|---|---|
| PSY35338 | CA | Clinical Psychologist primary |
| PSY35338 | CA | Psychologist |
This provider holds licence PSY35338 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 psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems. NUCC Health Care Provider Taxonomy, code 103TC0700X
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 | |
|---|---|---|---|---|
| 103TC0700X | Clinical Psychologist Clinical | PSY35338 | CA | primary |
| 103T00000X | Psychologist | PSY35338 | CA |
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 | 1003584418 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 31, 2021 |
| Last updated | Oct 2, 2024 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | PSY.D. |
| Practice address |
16465 SIERRA LAKES PKWY STE 140 Fontana, CA 92336 (909) 244-9593 |
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 | 8 | 4 | 4 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 8 | 8 | 4 | 2 |
Sum = 52 · next multiple of 10 = 60 · 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.