Doctor profile · Federal record
Dr. Greggory Gahn, MD
Retina Specialist (Ophthalmology) Physician (CMS: Ophthalmology) · Reno, NV
- NPI 1720541147
- Accepts Medicare
- MIPS 72.7 / 100 · 2023
- 7 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
950 Ryland St
Reno, NV 895021605
(757) 329-0286 - Mailing address
-
655 N Alvernon Way Ste 204
Tucson, AZ 857111825
Credentials & registration
- NPI registered
- April 2019 — 7 yrs on file
- Profile last updated
- October 3, 2025
- Year of graduation
- 2019 — 7 yrs since
- Specialty taxonomy
- 207WX0107X — NUCC code
- State license (1)
- Nevada #23736
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1720541147. Last verified May 11, 2026.Open Payments
Industry payments received
All-time total
$856
Transactions
27
Manufacturers
8
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Genentech USA, INC. | 11 | $316.93 | |
| Astellas Pharma US INC | 9 | $274.85 | |
| Ocular Therapeutix, INC. | 2 | $151.01 | |
| Harrow Eye, LLC | 1 | $32.53 | |
| Astellas Pharma Global Development | 1 | $23.29 | |
| Bausch & Lomb Americas INC. | 1 | $20.94 | |
| Alimera Sciences, INC. | 1 | $19.38 | |
| Ani Pharmaceuticals, INC. | 1 | $16.68 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
65
Patients
49
Total drug cost
$3,591
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisolone Acetate | Generic | 65 | 49 | $3,591 |
Hospital affiliations
Frequently asked questions
What is Dr. Greggory Gahn's medical specialty?
Dr. Greggory Gahn practices Retina Specialist (Ophthalmology) Physician in Reno, NV.
Where does Dr. Greggory Gahn practice?
Dr. Greggory Gahn practices at 950 Ryland St, Reno, NV 895021605. Office phone: 7573290286.
What is Dr. Greggory Gahn's NPI?
Dr. Greggory Gahn's National Provider Identifier (NPI) is 1720541147, issued by NPPES.
Does Dr. Greggory Gahn accept Medicare assignment?
Yes. Dr. Greggory Gahn accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.