Allen Chu, DDS
Allen Chu, DDS is a provider specialising in Oral and Maxillofacial Surgery (Dentist) in Downey, CA, registered under NPI 1003498346. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
Here is what surrounds this office in Downey, based on OpenStreetMap data collected Oct 1, 2026. Parking is available about 631 ft away. The nearest transit stop is 822 ft away, served by 7th & Western. If you arrive early, there is a coffee shop 0.42 mi away.
Getting here and what is nearby
Transit Metro 154 ft ~1 min
Parking 321 ft ~2 min
Parking 513 ft ~2 min
Parking 631 ft ~3 min
Transit Metro 762 ft ~3 min
Transit 7th & Western 822 ft ~4 min
Convenience Speedway 0.35 mi ~7 min
Gas station Speedway 0.36 mi ~8 min
Coffee 3rd Street Coffee 0.41 mi ~9 min
8221 #101 3rd Street, 90241
Mo-Fr 06:00-22:00; Sa 07:00-22:00; Su 07:00-22:30
Coffee Starbucks 0.42 mi ~9 min
Gas station Chevron 0.42 mi ~9 min
Paramount Boulevard, Downey 90241
Restaurant NORMS 0.42 mi ~9 min
Restaurant Tacos Gavilán 0.45 mi ~10 min
7947 Florence Avenue, Downey 90240
Su-Th 09:00-24:00; Fr-Sa 09:00-27:00
Restaurant The MarketPlace Grill Café 0.47 mi ~10 min
7877 Florence Avenue, Downey 90240
Mo-Su 08:00-20:00
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 |
|---|---|---|
| 109821 | CA | Oral and Maxillofacial Surgery (Dentist) primary |
This provider holds licence 109821 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Oral Surgery
- PAC ID
- 5991293201
- Enrollment ID
- I20260202002290
Medicare enrolment is recorded as approved under the provider type Practitioner - Oral Surgery. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Oral and Maxillofacial Surgery covers
The specialty of dentistry which includes the diagnosis, surgical and adjunctive treatment of diseases, injuries and defects involving both the functional and esthetic aspects of the hard and soft tissues of the oral and maxillofacial region. NUCC Health Care Provider Taxonomy, code 1223S0112X
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 | |
|---|---|---|---|---|
| 1223S0112X | Oral and Maxillofacial Surgery (Dentist) Oral and Maxillofacial Surgery | 109821 | CA | primary |
| 390200000X | Student in an Organized Health Care Education/Training Program | — | — |
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 | 1003498346 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 26, 2021 |
| Last updated | Jul 3, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | DDS |
| Practice address |
10601 PARAMOUNT BLVD Downey, CA 90241 (562) 923-7257 |
| Mailing address |
5918 SUNHAWK DR Santa Rosa, CA 95409 |
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 | 9 | 8 | 3 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 8 | 9 | 7 | 3 | 8 |
Sum = 64 · next multiple of 10 = 70 · check digit = 6 · actual last digit = 6
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.