Greg Olson, RRW
Greg Olson, RRW is an Addiction (Substance Use Disorder) Counselor in Fresno, CA, registered under NPI 1003248584.
Getting there
Here is what surrounds this office in Fresno, based on OpenStreetMap data collected Sep 13, 2026. Parking is available about 0.32 mi away. If you arrive early, there is a coffee shop 0.25 mi away.
Getting here and what is nearby
Restaurant Honey Baked Ham 299 ft ~2 min
Restaurant The Lime Lite 363 ft ~2 min
Restaurant Subway 586 ft ~3 min
1008 West Shaw Avenue, Fresno 93711
Mo-Fr 08:00-21:30; Sa-Su 09:00-21:00
Parking 0.23 mi ~5 min
Coffee Starbucks 0.24 mi ~5 min
704 West Shaw Avenue, Fresno 93704
Mo-Su 05:30-19:30
Coffee Patio Cafe 0.25 mi ~5 min
5138 North Palm Avenue, Fresno 93704
Mo-Su 07:00-15:00
Parking 0.26 mi ~6 min
Hotel San Joaquin Hotel 0.27 mi ~6 min
Grocery Whole Foods Market 0.30 mi ~7 min
650 West Shaw Avenue, Fresno 93740
Mo-Su 08:00-21:00
Parking 0.32 mi ~7 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 | 1003248584 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 6, 2013 |
| Last updated | Aug 6, 2013 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | RRW |
| Practice address |
1100 W SHAW AVE STE 122 Fresno, CA 93711 (559) 681-1947 Fax (559) 412-2126 |
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 | 2 | 4 | 8 | 5 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 4 | 7 | 5 | 7 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.