GREGGORY GAHN MD
NPI 1720541147
Ophthalmology - Retina Specialist in Tucson, AZ
About Greggory Gahn Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GREGGORY GAHN MD (NPI 1720541147) is an individual retina specialist in Tucson, Arizona, licensed in Arizona (80326) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS, is affiliated with Renown Regional Medical Center, and is a graduate of University Of Nevada School Of Medicine (2019).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Greggory Gahn Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Greggory Gahn reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tucson, AZ 85712
- Reassigned Medicare billing, Arizona enrollment
- 3 clinicians in this Medicare group
Reno, NV 89502
- Reassigned Medicare billing, Nevada enrollment
- 6 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Renown Regional Medical Center
Acute Care Hospitals · Reno, NVNorthern Nevada Medical Center
Acute Care Hospitals · Sparks, NVPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 85712 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 9
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
TUCSON, AZ 85712
TUCSON, AZ 85712
TUCSON, AZ 85712
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Greggory Gahn's NPI number?
The NPI number for Greggory Gahn is 1720541147. It was assigned to this individual provider in the NPPES registry on April 11, 2019.
Where is Greggory Gahn located?
Greggory Gahn practices at 3172 N Swan Rd, Tucson, AZ 85712. The listed phone number is (520) 881-1400.
What is Greggory Gahn's specialty?
The primary specialty registered for this NPI is Ophthalmology, specializing in Retina Specialist, with taxonomy code 207WX0107X.
Is Greggory Gahn enrolled in Medicare?
Yes. Greggory Gahn is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Greggory Gahn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Greggory Gahn reassigns Medicare benefits to 2 organizations: Retina Specialists Of Southern Arizona PLLC (Tucson, AZ) and Plecha Durant Stanko Johnson & Cohen A Professional Corporation (Reno, NV). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Greggory Gahn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Greggory Gahn accept?
Health plans from Blue Cross Blue Shield of Arizona and UnitedHealthcare list Greggory Gahn as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Greggory Gahn affiliated with any hospitals?
According to CMS data, Greggory Gahn is affiliated with Renown Regional Medical Center and Northern Nevada Medical Center.
When was this NPI record last updated?
The NPPES record for Greggory Gahn was last updated on September 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Greggory Gahn, MD · NPI 1720541147
Retina Specialist physician in Tucson, Arizona. Individual provider, active in the CMS NPPES registry since April 11, 2019.
## Identity
- **NPI:** 1720541147 (Entity type: Individual)
- **Enumerated:** April 11, 2019
- **Primary specialty:** Ophthalmology - Retina Specialist · taxonomy 207WX0107X
- **State license:** 80326 (Arizona)
- **Sole proprietor:** No
## Practice location
- **Address:** 3172 N SWAN RD, Tucson, AZ 85712-1227
- **Phone:** (520) 881-1400
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Retina Specialists Of Southern Arizona PLLC (NPI 1902037310, Tucson, AZ); Plecha Durant Stanko Johnson & Cohen A Professional Corporation (NPI 1316022551, Reno, NV) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Nevada School Of Medicine, class of 2019
## Record status
- **NPPES last updated:** September 9, 2026
- **Other identifiers:** Other CP8528 (NV)
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Source: [NPI Profile](https://npiprofile.com/npi/1720541147) · Data from the CMS NPPES public registry.