Derek Lauritzen, M.D.
Derek Lauritzen, M.D. is a Retina Specialist (Ophthalmology) Physician in San Luis Obispo, CA, registered under NPI 1841348166. 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 941 CALIFORNIA BLVD, San Luis Obispo, CA 93401. 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 |
|---|---|---|
| G77319 | CA | Retina Specialist (Ophthalmology)… primary |
| G77319 | CA | Ophthalmology Physician |
This provider holds licence G77319 issued in CA. 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 - Ophthalmology
- PAC ID
- 1254328339
Medicare enrolment is recorded as approved under the provider type Practitioner - Ophthalmology. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Retina Specialist covers
An ophthalmologist who specializes in the diagnosis and treatment of vitreoretinal diseases. NUCC Health Care Provider Taxonomy, code 207WX0107X
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 | |
|---|---|---|---|---|
| 207WX0107X | Retina Specialist (Ophthalmology) Physician Retina Specialist | G77319 | CA | primary |
| 207W00000X | Ophthalmology Physician | G77319 | 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 | 1841348166 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 5, 2007 |
| Last updated | Mar 24, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
941 CALIFORNIA BLVD San Luis Obispo, CA 93401 (805) 434-2350 Fax (805) 434-9888 |
| Other identifiers |
7808216
· AETNA PIN (CA) 00G773190 (CA) G77319 · BLUE CROSS (CA) 00G773190 · BLUE SHIELD OF CALIFORNIA (CA) |
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 | 8 | 4 | 1 | 3 | 4 | 8 | 1 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 8 | 1 | 6 | 4 | 7 | 1 | 3 |
Sum = 64 · next multiple of 10 = 70 · check digit = 6 · actual last digit = 6
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.