John Niffenegger, MD
John Niffenegger, MD is a Retina Specialist (Ophthalmology) Physician in Sarasota, FL, registered under NPI 1518910280. 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 3920 BEE RIDGE RD BLDG D, Sarasota, FL 34233. 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 |
|---|---|---|
| ME88190 | FL | Ophthalmology Physician |
| ME88190 | FL | Retina Specialist (Ophthalmology)… primary |
This provider holds licence ME88190 issued in FL. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
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.
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 | |
|---|---|---|---|---|
| 207W00000X | Ophthalmology Physician | ME88190 | FL | |
| 207WX0107X | Retina Specialist (Ophthalmology) Physician Retina Specialist | ME88190 | FL | primary |
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 | 1518910280 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 17, 2006 |
| Last updated | Jul 14, 2021 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | MD |
| Practice address |
3920 BEE RIDGE RD BLDG D Sarasota, FL 34233 (941) 924-0303 |
| Other identifiers |
268219200
· Medicaid (FL) |
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 | 5 | 1 | 8 | 9 | 1 | 0 | 2 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 2 | 8 | 9 | 1 | 0 | 2 | 7 |
Sum = 60 · next multiple of 10 = 60 · check digit = 0 · actual last digit = 0
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.