Ah Yeon Chang, RN
Ah Yeon Chang, RN is a Case Management Registered Nurse in Los Angeles, CA, registered under NPI 1003423070.
Getting there
Here is what surrounds this office in Los Angeles, based on OpenStreetMap data collected Sep 22, 2026. Parking is available about 661 ft away. The nearest transit stop is 529 ft away, served by Cesar E Chavez & State. A pharmacy sits 0.48 mi from the entrance (Walgreens), which helps if you leave with a prescription.
Getting here and what is nearby
Transit Cesar E Chavez & Boyle 483 ft ~2 min
Transit Cesar E Chavez & State 506 ft ~2 min
Transit Cesar E Chavez & State 529 ft ~3 min
Parking 517 ft ~2 min
Parking 559 ft ~3 min
Restaurant Subway 559 ft ~3 min
1821 East Cesar Chavez Avenue, Los Angeles 90033
Mo-Sa 07:00-23:00; Su 09:00-21:00
Parking 661 ft ~3 min
Restaurant Santa Cecilia Restaurant 0.20 mi ~4 min
Restaurant El Pollo Loco 0.26 mi ~6 min
2000 Cesar E Chavez Avenue, Los Angeles 90033
Mo-Su 10:00-21:00
Convenience 7-Eleven 0.47 mi ~10 min
Gas station Shell 0.48 mi ~10 min
Pharmacy Walgreens 0.48 mi ~10 min
Gas station 76 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 |
|---|---|---|
| 793120 | CA | Case Management Registered Nurse primary |
This provider holds licence 793120 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 Case Management covers
Definition to come... NUCC Health Care Provider Taxonomy, code 163WC0400X
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 | 1003423070 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 24, 2020 |
| Last updated | Sep 24, 2020 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | RN |
| Practice address |
1720 E CESAR E CHAVEZ AVE Los Angeles, CA 90033 (323) 268-5000 |
| Mailing address |
216 W MERLOT DR Covina, CA 91723 |
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 | 3 | 0 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 2 | 6 | 0 | 5 |
Sum = 50 · next multiple of 10 = 50 · check digit = 0 · actual last digit = 0
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.