Erin Chung
Erin Chung is an Occupational Therapist in Diamond Bar, CA, registered under NPI 1003765082. 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 Diamond Bar, based on OpenStreetMap data collected Oct 31, 2026. Parking is available about 811 ft away. There is EV charging 499 ft from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 0.24 mi away, served by Foothill Transit 482. If you arrive early, there is a coffee shop 854 ft away.
Getting here and what is nearby
Restaurant Seoul BBQ 285 ft ~2 min
Parking 298 ft ~2 min
Grocery Hannam Market World 435 ft ~2 min
21080 Golden Springs Drive, Diamond Bar 91789
Mo-Su 08:00-22:00
EV charging Tesla Supercharger 499 ft ~2 min
Parking 686 ft ~3 min
Gas station Mobil 738 ft ~3 min
1024 Brea Canyon Road, Diamond Bar 91765
Restaurant Pho Ha Plus 714 ft ~3 min
21090 Golden Springs Drive, Diamond Bar 91789
Mo-Th 11:00-21:00; Fr-Su 10:00-21:00
Restaurant IL Poom 721 ft ~3 min
Parking 811 ft ~4 min
Transit Foothill Transit 482 831 ft ~4 min
Coffee Starbucks 854 ft ~4 min
21060 Golden Springs Drive, Diamond Bar 91789
Mo-Fr 05:00-20:30; Sa-Su 05:30-20:30
Grocery Diamond Fresh Farmers Market 819 ft ~4 min
21168 Golden Springs Drive, Diamond Bar 91765
Transit Foothill Transit 482 903 ft ~4 min
Gas station Shell 962 ft ~4 min
21103 Golden Springs Drive, Diamond Bar 91789-3924
24/7
Gas station Chevron 967 ft ~4 min
21095 Golden Springs Drive, Diamond Bar 91765
Transit Foothill Transit 482 0.24 mi ~5 min
Convenience ampm 0.42 mi ~9 min
780 Brea Canyon Road, City of Industry 91789
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 |
|---|---|---|
| 28685 | CA | Occupational Therapist primary |
This provider holds licence 28685 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 Occupational Therapist covers
An occupational therapist is a person who has graduated from an entry-level occupational therapy program accredited by the Accreditation Council for Occupational Therapy Education (ACOTE) or predecessor organizations, or approved by the World Federation of Occupational Therapists (WFOT), or an equivalent international occupational therapy education program; has successfully completed a period of supervised fieldwork experience required by the occupational therapy program; has passed a nationally recognized entry-level examination for occupational therapists, and fulfills state requirements for licensure, certification, or registration. An occupational therapist provides interventions based on evaluation and which emphasize the therapeutic use of everyday life activities (i.e., occupations) with individuals or groups for the purpose of facilitating participation in roles and situations and in home, school, workplace, community and other settings. Occupational therapy services are provided for the purpose of promoting health and wellness and are provided to those who have or are at risk for developing an illness, injury, disease, disorder, condition, impairment, disability, activity limitation, or participation restriction. Occupational therapists address the physical, cognitive, psychosocial, sensory, and other aspects of occupational performance in a variety of contexts to support engagement in everyday life activities that affect health, well-being, and quality of life. NUCC Health Care Provider Taxonomy, code 225X00000X
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 | 1003765082 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 23, 2026 |
| Last updated | Jan 23, 2026 |
| Status | Active |
| Sole proprietor | Yes |
| Practice address |
3220 S BREA CANYON RD STE E Diamond Bar, CA 91765 (909) 258-9292 |
| Mailing address |
805 CHARLESTON WAY Brea, CA 92821 |
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 | 7 | 6 | 5 | 0 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 5 | 6 | 1 | 0 | 7 |
Sum = 48 · next multiple of 10 = 50 · check digit = 2 · actual last digit = 2
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.