Greggory Gahn, MD
Retina Specialist (Ophthalmology) Physician · Reno, NV
Greggory Gahn, MD is a retina specialist (ophthalmology) physician with a practice address in Reno, Nevada, and NPI 1720541147, issued on Apr 11, 2019. Check the license (Nevada 23736, as entered in NPPES) on the Nevada State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Greggory Gahn
- Credential
- MD
- Primary taxonomy
- Retina Specialist (Ophthalmology) Physician 207WX0107X
- License number
- 23736 NV
Self-reported in NPPES; status is on the state search - Practice location
- 950 Ryland St, Reno, NV 89502
- Phone
- (757) 329-0286
- Enumerated
- Apr 11, 2019
- Record last updated
- Oct 3, 2025
- Medicare enrollment
- Enrolled (PECOS I20230606002444); accepts Medicare assignment
- Medical or professional school
- University Of Nevada School Of Medicine, 2019
- Entity
- Type 1 · individual
8 nearest retina specialist (ophthalmology) physician records → All 13 in Nevada → Look up another NPI →
Also registered at 950 Ryland St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Geoffrey Cecchi, MDOphthalmology Physician1063481729
- William Durant, MDOphthalmology Physician1669441309
- Pauline Hong, MDOphthalmology Physician1780653063
- Leonard Johnson, MDOphthalmology Physician1417926742
- Arshad Khanani, M.D.Ophthalmology Physician1295929511
- Michael Stanko, MDOphthalmology Physician1497724728
Verify Greggory Gahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNevada State Board of Medical Examiners
Search for license 23736Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
30% fewer Medicare Part D claims than the average retina specialist (ophthalmology) physician in 2024
431 Medicare Part D claims for 179 beneficiaries, against an average of 620 among the 1,449 providers of this specialty who prescribed in Part D. Brand-name drugs were 57% of claims.
Most prescribed
- Prednisolone Acetate228 claims
- Dorzolamide-Timolol54 claims
- Erythromycin31 claims
- Brimonidine Tartrate19 claims
- Neomycin-Polymyxin-Dexameth17 claims
- Timolol Maleate17 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 72.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $855.61
27 payments; by number, the most common kind was food and beverage; the largest payer was Genentech USA, Inc. The 1,253 providers of this specialty with any payment received $7,667.49 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Plecha Durant Stanko Johnson And Cohen A Professional CorporationReno, NV
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Greggory Gahn among 13 retina specialist (ophthalmology) physician records in Nevada
Greggory Gahn, MD is one of 13 retina specialist (ophthalmology) physician records with a practice address in Nevada. 100% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 92% of them.
- NPI issued2019 · 92% of these records are older, 0% newer
- In a Medicare fileYes · 100% of these records are
- In the CMS Doctors and Clinicians fileYes · 100% of these records are
- Graduated2019 · median 2011 among the 13 with a school on file
- Record last updated2025 · 31% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207WX0107X and a Nevada practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Retina Specialist (Ophthalmology) Physician providers in Nevada
There are 13 retina specialist (ophthalmology) physician records in Nevada.
All 13 in Nevada → Every provider in Reno → Retina Specialist (Ophthalmology) Physician nationwide →
The 8 retina specialist (ophthalmology) physician records with the nearest ZIP codes
- Spencer Fuller, MD, MPHReno, NV 895111124513023
- William Stevenson, M.D.Reno, NV 895111386084119
- Alec Amram, M.D.Las Vegas, NV 891481275953846
- Charles Calvo, MDLas Vegas, NV 891441194087940
- George Par, M.D.Las Vegas, NV 891281922325448
- Tyson Ward, M.D.Las Vegas, NV 891281578791372
- Chris Wu, M.D.Las Vegas, NV 891281265829345
- Russell Jayne, MDLas Vegas, NV 891171689671687
Common questions
What is Greggory Gahn, MD's NPI number?
Greggory Gahn, MD's National Provider Identifier (NPI) is 1720541147, issued on Apr 11, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Greggory Gahn, MD located?
The NPPES record lists a practice address at 950 Ryland St, Reno, NV, 89502. Phone: (757) 329-0286. Providers update this record themselves, so call before visiting.
How can I verify Greggory Gahn, MD's license?
NPPES lists Nevada license number 23736, as entered by the provider. Search the Nevada State Board of Medical Examiners at https://medboard.nv.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Greggory Gahn, MD prescribe under Medicare Part D?
In 2024, Greggory Gahn, MD had 431 Medicare Part D claims for 179 beneficiaries; the average among retina specialist (ophthalmology) physician prescribers was 620. Part D covers Medicare prescriptions only.
What is Greggory Gahn, MD's MIPS final score?
The 2023 MIPS final score is 72.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.