Joseph Harrington, RADT
Joseph Harrington, RADT is an Addiction (Substance Use Disorder) Counselor in San Pedro, CA, registered under NPI 1003619735.
Getting there
Here is what surrounds this office in San Pedro, based on OpenStreetMap data collected Oct 10, 2026. Parking is available about 0.33 mi away at Harbor Beacon Park and Ride. The nearest transit stop is 829 ft away. If you arrive early, there is a coffee shop 0.40 mi away.
Getting here and what is nearby
Transit Beacon Street & 1st Street 382 ft ~2 min
Transit Beacon Street & 1st Street 436 ft ~2 min
Parking 539 ft ~3 min
Parking 654 ft ~3 min
Coffee Colossus 745 ft ~3 min
511 South Harbor Boulevard, San Pedro 90731
Mo-Fr 07:00-20:00; Sa,Su 08:00-20:00
Transit 829 ft ~4 min
Coffee Hojas Tea House 0.27 mi ~6 min
222 West 6th Street, San Pedro 90731
Mo-Sa 06:00-22:00
Restaurant Think Cafe 0.28 mi ~6 min
Restaurant Buono's Pizzeria 0.29 mi ~6 min
Hotel Crowne Plaza Los Angeles Harbor Hotel 0.30 mi ~6 min
601 South Palos Verdes Street, San Pedro 90731
Restaurant La Bocca Felice 0.32 mi ~7 min
301 West 6th Street, San Pedro 90731
Tu-Th 16:00-21:30, Fr-Su 11:30-21:00
Parking Harbor Beacon Park and Ride 0.33 mi ~7 min
515 N Beacon @ N Harbor Blvd, San Pedro 90731
Grocery 7 Days Food Store 0.36 mi ~8 min
Coffee Distrito Coffee 0.40 mi ~9 min
345 West 7th Street, San Pedro 90731
Mo-Fr 07:00-15:00; Sa,Su 07:00-16:00
Grocery Superior Grocers 0.46 mi ~10 min
Hotel All Star Inn 0.47 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 |
|---|---|---|
| R1588891224 | CA | Addiction (Substance Use Disorder)… primary |
This provider holds licence R1588891224 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 Addiction (Substance Use Disorder) covers
Definition to come... NUCC Health Care Provider Taxonomy, code 101YA0400X
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 | 1003619735 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 28, 2025 |
| Last updated | Mar 28, 2025 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | RADT |
| Practice address |
1003 S BEACON ST San Pedro, CA 90731 (310) 514-4940 |
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 | 6 | 1 | 9 | 7 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 3 | 1 | 9 | 7 | 6 |
Sum = 55 · next multiple of 10 = 60 · check digit = 5 · actual last digit = 5
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.