Randyn Mcmillan, CO, LDO
Randyn Mcmillan, CO, LDO is a provider specialising in Orthoptist in Crestview, FL, registered under NPI 1124775168. 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 4100 S FERDON BLVD, Crestview, FL 32536. 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 |
|---|---|---|
| LDO7360 | FL | Optician |
| LDO002944 | GA | Optician |
| DPO3507 | TN | Optician |
Licences are recorded in 3 states: FL, GA, TN. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
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.
Licensed in 3 states
This provider holds licences in 3 states: Florida, Georgia and Tennessee. The practice address on file is in Crestview, FL, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Orthoptist covers
An orthoptist is an allied health professional skilled in evaluation and treatment of children and adults with eye movement difficulties. Their specialty is strabismus, amblyopia, and double vision. NUCC Health Care Provider Taxonomy, code 156FX1900X
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 | |
|---|---|---|---|---|
| 156FX1900X | Orthoptist Orthoptist | — | — | primary |
| 156FX1800X | Optician Optician | LDO7360 | FL | |
| 156FX1800X | Optician Optician | LDO002944 | GA | |
| 156FX1800X | Optician Optician | DPO3507 | TN |
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 | 1124775168 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 9, 2022 |
| Last updated | Mar 10, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | CO, LDO |
| Practice address |
4100 S FERDON BLVD Crestview, FL 32536 (850) 204-4762 |
| Mailing address |
4100 S FERDON BLVD STE C2 Crestview, FL 32536 |
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 | 2 | 4 | 7 | 7 | 5 | 1 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 4 | 4 | 5 | 7 | 1 | 1 | 3 |
Sum = 52 · next multiple of 10 = 60 · check digit = 8 · actual last digit = 8
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.