Mark Sullivan, OD
Mark Sullivan, OD is a provider specialising in Occupational Vision Optometrist in Louisville, KY, registered under NPI 1093400269. 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 4414 SHELBYVILLE RD STE 204, Louisville, KY 40207. 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 |
|---|---|---|
| 2311DT | KY | Occupational Vision Optometrist primary |
| 2311DT | KY | Optometrist |
This provider holds licence 2311DT issued in KY. 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 - Optometry
- PAC ID
- 2668828674
- Enrollment ID
- I20231027000816
Medicare enrolment is recorded as approved under the provider type Practitioner - Optometry. 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 Occupational Vision covers
Optometrists who work in Occupational Vision, the branch of environmental optometry, consider all aspects of the relationship between work and vision, visual performances, eye safety, and health. NUCC Health Care Provider Taxonomy, code 152WX0102X
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 | |
|---|---|---|---|---|
| 152WX0102X | Occupational Vision Optometrist Occupational Vision | 2311DT | KY | primary |
| 152W00000X | Optometrist | 2311DT | KY |
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 | 1093400269 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 5, 2023 |
| Last updated | Apr 5, 2023 |
| Status | Active |
| Sole proprietor | No |
| Credential | OD |
| Practice address |
4414 SHELBYVILLE RD STE 204 Louisville, KY 40207 (504) 894-4434 |
| Mailing address |
1053 MERRICK DR APT 141 Lexington, KY 40502 |
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 | 4 | 0 | 0 | 2 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 9 | 3 | 8 | 0 | 0 | 2 | 3 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.