Kresta Grabau, RN
Kresta Grabau, RN is an Oncology Registered Nurse in Fountain Valley, CA, registered under NPI 1093521346. This provider registers 4 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 18111 BROOKHURST ST STE 4300, Fountain Valley, CA 92708. 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 |
|---|---|---|
| 719888 | CA | Oncology Registered Nurse primary |
| 719888 | CA | Case Management Registered Nurse |
| 719888 | CA | General Practice Registered Nurse |
| 719888 | CA | Ambulatory Care Registered Nurse |
This provider holds licence 719888 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 Oncology covers
Definition to come... NUCC Health Care Provider Taxonomy, code 163WX0200X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 163WX0200X | Oncology Registered Nurse Oncology | 719888 | CA | primary |
| 163WC0400X | Case Management Registered Nurse Case Management | 719888 | CA | |
| 163WG0000X | General Practice Registered Nurse General Practice | 719888 | CA | |
| 163WP2201X | Ambulatory Care Registered Nurse Ambulatory Care | 719888 | CA |
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 | 1093521346 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Dec 10, 2024 |
| Last updated | Jan 8, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | RN |
| Practice address |
18111 BROOKHURST ST STE 4300 Fountain Valley, CA 92708 (714) 378-7650 |
| Mailing address |
386 N EARLHAM ST Orange, CA 92869 |
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 | 9 | 3 | 5 | 2 | 1 | 3 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 9 | 3 | 1 | 2 | 2 | 3 | 8 |
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.