NPIMap

Individual provider Active NPI

Greggory Gahn, MD

  • Retina Specialist (Ophthalmology) Physician
  • Tucson, AZ
National Provider Identifier
1720541147
Registry record updated Sep 9, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Retina Specialist (Ophthalmology) PhysicianTaxonomy code 207WX0107X
License
80326 Issued in AZ
Practice address
3172 N Swan Rd
Tucson, AZ 85712-1227
Phone
(520) 881-1400
NPI assigned
Apr 11, 2019
Last updated
Sep 9, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Sep 9, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Retina Specialist (Ophthalmology) Physician 207WX0107X 80326 AZ Primary

Addresses

Primary practice location

3172 N Swan Rd
Tucson, AZ 85712-1227

Mailing address

3172 N Swan Rd
Tucson, AZ 85712-1227
Phone (520) 881-1400

Other identifiers 1

IdentifierTypeStateIssuer
CP8528OtherNVCP8528

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in NV, AZ2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20230606002444 NV Practitioner - Ophthalmology 5698000933 Reassigns benefits to 1 organization
I20260616002165 AZ Practitioner - Ophthalmology 5698000933 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Ophthalmology
Education
University of Nevada School of Medicine, 2019
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices

Practice addresses (Care Compare)

950 Ryland St
Reno, NV 89502-1605
Phone (775) 329-0286

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
76.65 of 100Reported as group
Quality
69.05
Improvement activities
40
Cost
63.45

Procedures performed for Medicare patients

ProcedureNumber of procedures
Cataract surgery1-10

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
23736NVMDRetina Specialist (Ophthalmology) Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Plecha Durant Stanko Johnson & Cohen a Professional Corporation Ophthalmology CurrentSince Jul 1, 2023 Accepting new patients
Plecha Durant Stanko Johnson & Cohen a Professional Corporation Ophthalmology CurrentSince Jul 1, 2023 Accepting new patients

Locations

950 Ryland St
Reno, NV 89502
Phone (702) 329-0286

Interoperability endpoints

  • Direct secure messaging: ggahn@sea.intellechartdirect.net

Organizations & group practices 3

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

Hospital & facility affiliations 8

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1554940800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1788912000000",
    "number": "1720541147",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3172 N SWAN RD",
            "city": "TUCSON",
            "state": "AZ",
            "postal_code": "857121227",
            "telephone_number": "520-881-1400"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3172 N SWAN RD",
            "city": "TUCSON",
            "state": "AZ",
            "postal_code": "857121227",
            "telephone_number": "520-881-1400"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GAHN",
        "first_name": "GREGGORY",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-04-11",
        "last_updated": "2026-09-09",
        "certification_date": "2026-09-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207WX0107X",
            "taxonomy_group": "",
            "desc": "Ophthalmology, Retina Specialist",
            "state": "AZ",
            "license": "80326",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "CP8528",
            "identifier": "CP8528",
            "state": "NV"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Tucson, AZ

Sources for this page

Verify at the official NPI Registry.