Catherine Crosby, APRN
Catherine Crosby, APRN is a Psychiatric/Mental Health Nurse Practitioner in Summerville, SC, registered under NPI 1316308794. This provider registers 3 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 1801 OLD TROLLEY RD STE 200, Summerville, SC 29485. 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 |
|---|---|---|
| 20001 | SC | Psychiatric/Mental Health Nurse… primary |
| 20004 | SC | Family Nurse Practitioner |
| 20004 | SC | Obstetrics & Gynecology Nurse Practitioner |
This provider holds licence 20001 issued in SC. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Nurse Practitioner
- PAC ID
- 2466797139
- Enrollment ID
- I20181227002068
Medicare enrolment is recorded as approved under the provider type Practitioner - Nurse Practitioner. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Psychiatric/Mental Health covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LP0808X
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 | |
|---|---|---|---|---|
| 363LP0808X | Psychiatric/Mental Health Nurse Practitioner Psychiatric/Mental Health | 20001 | SC | primary |
| 363LF0000X | Family Nurse Practitioner Family | 20004 | SC | |
| 363LX0001X | Obstetrics & Gynecology Nurse Practitioner Obstetrics & Gynecology | 20004 | SC |
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 | 1316308794 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 14, 2016 |
| Last updated | Oct 21, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | APRN |
| Practice address |
1801 OLD TROLLEY RD STE 200 Summerville, SC 29485 (843) 781-0075 Fax (854) 222-9097 |
| Other identifiers |
NP4317
· Medicaid (SC) |
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 | 3 | 1 | 6 | 3 | 0 | 8 | 7 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 3 | 2 | 6 | 6 | 0 | 7 | 7 | 9 |
Sum = 66 · next multiple of 10 = 70 · check digit = 4 · actual last digit = 4
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.