Cassandra Haynesworth
Cassandra Haynesworth is an Intellectual & Developmental Disabilities Psychologist in Portsmouth, VA, registered under NPI 1134877707. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 521 MOUNT PLEASANT DR, Portsmouth, VA 23707. 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 |
|---|---|---|
| 3876 | VA | Nursing Care Agency |
This provider holds licence 3876 issued in VA. 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 Intellectual & Developmental Disabilities covers
Definition to come... NUCC Health Care Provider Taxonomy, code 103TM1800X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 103TM1800X | Intellectual & Developmental Disabilities Psychologist Intellectual & Developmental Disabilities | — | — | primary |
| 251J00000X | Nursing Care Agency | 3876 | VA |
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 | 1134877707 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 14, 2022 |
| Last updated | Feb 22, 2026 |
| Status | Active |
| Sole proprietor | No |
| Practice address |
521 MOUNT PLEASANT DR Portsmouth, VA 23707 (757) 535-7595 |
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 | 1 | 3 | 4 | 8 | 7 | 7 | 7 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 6 | 4 | 7 | 7 | 5 | 7 | 0 |
Sum = 63 · next multiple of 10 = 70 · 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.