Derrick Montgomery, M.D.
Derrick Montgomery, M.D. is a Cornea and External Diseases Specialist Physician in Andrews Afb, MD, registered under NPI 1225133499. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 316TH MDG 1060 W. PERIMETER RD SUITE 3K43, Andrews Afb, MD 20762. 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 |
|---|---|---|
| 35.125039 | OH | Cornea and External Diseases Specialist… primary |
| A96117 | CA | Ophthalmology Physician |
| 35.125039 | OH | Retina Specialist (Ophthalmology)… |
Licences are recorded in 2 states: OH, CA. 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 2 states
This provider holds licences in 2 states: California and Ohio. Multi-state licensure often means the provider works near a state border, covers more than one office, or delivers care 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
- 35.125039
- Specialty
- Cornea and External Diseases Specialist…
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 Cornea and External Diseases Specialist covers
An ophthalmologist who specializes in diseases of the cornea, sclera, eyelids, conjunctiva, and anterior segment of the eye. NUCC Health Care Provider Taxonomy, code 207WX0120X
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 | |
|---|---|---|---|---|
| 207WX0120X | Cornea and External Diseases Specialist Physician Cornea and External Diseases Specialist | 35.125039 | OH | primary |
| 207W00000X | Ophthalmology Physician | A96117 | CA | |
| 207WX0107X | Retina Specialist (Ophthalmology) Physician Retina Specialist | 35.125039 | OH |
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 | 1225133499 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 13, 2006 |
| Last updated | Jun 6, 2022 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
316TH MDG 1060 W. PERIMETER RD SUITE 3K43 Andrews Afb, MD 20762 (240) 612-1730 |
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 | 2 | 2 | 5 | 1 | 3 | 3 | 4 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 2 | 4 | 5 | 2 | 3 | 6 | 4 | 9 |
Sum = 61 · next multiple of 10 = 70 · 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.