Carol Armstrong, PH.D., ABPN
Carol Armstrong, PH.D., ABPN is a provider specialising in Clinical Neuropsychologist in Philadelphia, PA, registered under NPI 1407879430. This provider registers 4 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 100 N 20TH ST, Philadelphia, PA 19103. 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 |
|---|---|---|
| PS004399L | PA | Clinical Neuropsychologist primary |
| PS004399L | PA | Pediatrics Physician |
| PS004399L | PA | Pediatric Hematology & Oncology Physician |
| PS004399L | PA | Neurodevelopmental Disabilities Physician |
This provider holds licence PS004399L issued in PA. 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 Clinical Neuropsychologist covers
A clinical psychologist who applies principles of assessment and intervention based upon the scientific study of human behavior as it relates to normal and abnormal functioning of the central nervous system. The specialty is dedicated to enhancing the understanding of brain-behavior relationships and the application of such knowledge to human problems. NUCC Health Care Provider Taxonomy, code 103G00000X
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 | |
|---|---|---|---|---|
| 103G00000X | Clinical Neuropsychologist | PS004399L | PA | primary |
| 208000000X | Pediatrics Physician | PS004399L | PA | |
| 2080P0207X | Pediatric Hematology & Oncology Physician Pediatric Hematology-Oncology | PS004399L | PA | |
| 2084P0005X | Neurodevelopmental Disabilities Physician Neurodevelopmental Disabilities | PS004399L | PA |
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 | 1407879430 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 25, 2006 |
| Last updated | Dec 5, 2008 |
| Status | Active |
| Sole proprietor | No |
| Credential | PH.D., ABPN |
| Practice address |
100 N 20TH ST Philadelphia, PA 19103 (215) 556-7242 |
| Other identifiers |
001709644
(PA) |
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 | 4 | 0 | 7 | 8 | 7 | 9 | 4 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 0 | 7 | 7 | 7 | 9 | 4 | 6 |
Sum = 70 · next multiple of 10 = 70 · check digit = 0 · actual last digit = 0
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.