Haley Issichopoulos, MSM, PA-C
Haley Issichopoulos, MSM, PA-C is a Medical Physician Assistant in Portola Valley, CA, registered under NPI 1699288027. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 844 PORTOLA RD, Portola Valley, CA 94028. 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 |
|---|---|---|
| 54940 | CA | Medical Physician Assistant primary |
| 54940 | CA | Otology & Neurotology Physician |
| 54950 | CA | Surgical Physician Assistant |
This provider holds licence 54940 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 Medical covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363AM0700X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 363AM0700X | Medical Physician Assistant Medical | 54940 | CA | primary |
| 207YX0901X | Otology & Neurotology Physician Otology & Neurotology | 54940 | CA | |
| 363AS0400X | Surgical Physician Assistant Surgical | 54950 | 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 | 1699288027 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 7, 2017 |
| Last updated | May 10, 2021 |
| Status | Active |
| Sole proprietor | No |
| Credential | MSM, PA-C |
| Practice address |
844 PORTOLA RD Portola Valley, CA 94028 (650) 494-1000 |
| Mailing address |
620 MOUNTAIN HOME RD Woodside, CA 94062 |
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 | 6 | 9 | 9 | 2 | 8 | 8 | 0 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 9 | 9 | 4 | 8 | 7 | 0 | 4 |
Sum = 73 · next multiple of 10 = 80 · check digit = 7 · actual last digit = 7
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.