Edward Siahaan, CTRS
Edward Siahaan, CTRS is a Recreation Therapist in Riverside, CA, registered under NPI 1205771086.
Getting there
The practice address on file is 3933 HARRISON ST, Riverside, CA 92503. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| CTRS32156 | CA | Recreation Therapist primary |
This provider holds licence CTRS32156 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 Recreation Therapist covers
A recreation therapist uses recreational activities for intervention in some physical, social or emotional behavior to bring about a desired change in that behavior and promote the growth and development of the patient. NUCC Health Care Provider Taxonomy, code 225800000X
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 | 1205771086 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 20, 2026 |
| Last updated | Apr 20, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | CTRS |
| Practice address |
3933 HARRISON ST Riverside, CA 92503 (833) 391-0505 |
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 | 2 | 0 | 5 | 7 | 7 | 1 | 0 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 0 | 5 | 5 | 7 | 2 | 0 | 7 |
Sum = 54 · next multiple of 10 = 60 · 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.