Gregory S. Koenig, OD
- Medicare patients, 2024
- 321
- Part D claims, 2024
- 105
- Industry payments
- $86
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 65 N Taylor St, Fallon, NV 89406
- Practice phone
- Call (775) 423-8024
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Dr Carl D Robertson and Dr Gregory S Koenig Optometrists
Fallon, Nevada
Find Gregory Koenig's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Gregory S. Koenig is an optometrist in Fallon, Nevada
Gregory Koenig practices at Dr Carl D Robertson and Dr Gregory S Koenig Optometrists in Fallon, Nevada.
Gregory Koenig's NPI, 1255301388, was assigned on January 23, 2006. Gregory Koenig graduated from Pacific University - College of Optometry in 1996. Gregory Koenig holds Nevada license 321.
- NPI
- 1255301388NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9335137652
- NPI enumeration date
- January 23, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (775) 423-8024
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Gregory S. Koenig practices at Dr Carl D Robertson and Dr Gregory S Koenig Optometrists in Fallon, Nevada
Gregory Koenig's primary practice is Dr Carl D Robertson and Dr Gregory S Koenig Optometrists, at 65 N Taylor St, Fallon, NV 89406 in Churchill County. The practice phone is (775) 423-8024.
- Dr Carl D Robertson and Dr Gregory S Koenig Optometrists65 N Taylor St, Fallon, NV 89406 · Churchill CountyPhone(775) 423-8024
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Gregory S. Koenig is affiliated with 2 sites of care and 1 medical group
Gregory Koenig's primary practice is Dr Carl D Robertson and Dr Gregory S Koenig Optometrists in Fallon, Nevada. Dmand AI also links Gregory Koenig to 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Gregory S. Koenig's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Gregory Koenig practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr Carl D Robertson and Dr Gregory S Koenig Optometrists | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Gregory S. Koenig is one of 387 optometrists in Nevada
Optometrist is Gregory Koenig's primary specialty in the NPI Registry, under taxonomy code 152W00000X. Gregory Koenig is licensed in Nevada.
Specialties and state licenses
- Optometrist, NevadaPrimary
Optometrists near Gregory Koenig
Counts of optometrists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Gregory S. Koenig treated 321 Medicare patients in 2024, average age 75
CMS counts 321 Medicare patients who saw Gregory Koenig in 2024. The largest group is 65 to 74, with 130 patients. 69% of them have high cholesterol, and 66% have high blood pressure. 17% are also on Medicaid. Their average risk score is 0.95, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Gregory Koenig's median patient age at 69, with 57% women.
Gregory Koenig's Medicare patients by age, 2024
Gregory Koenig's Medicare patients by sex, 2024
- Women19260%
- Men12940%
Chronic conditions among Gregory Koenig's Medicare patients, 2024
- High cholesterol69%
- High blood pressure66%
- Arthritis36%
- Diabetes26%
- Chronic kidney disease23%
- COPD21%
- Mood disorders17%
- Anxiety16%
Share of Medicare patients with each condition. A patient can have several.
Gregory Koenig's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Gregory S. Koenig wrote 105 Medicare Part D claims in 2024
In 2024, Gregory Koenig wrote 105 Medicare Part D claims for 39 patients. 63% of them were for generic drugs.
Gregory Koenig's Part D claims by kind of drug, 2024
- Generic66 claims63%
- Brand-name39 claims37%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Gregory S. Koenig ranks in the 61st percentile for cataract surgery in Medicare
Gregory Koenig accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 45 procedures of cataract surgery by Gregory Koenig, more than 61% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Gregory Koenig ranks in Medicare procedure volume
- Cataract surgery
- 61st percentile45 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Gregory S. Koenig received $86 in industry payments in 2025
CMS Open Payments shows 1 general payment to Gregory Koenig from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. CooperVision Inc. paid the most, $86.
Companies that paid Gregory Koenig the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Gregory S. Koenig graduated from Pacific University - College of Optometry
Gregory Koenig graduated from Pacific University - College of Optometry in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Gregory S. Koenig's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Gregory S. Koenig
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Gregory S. Koenig's NPI number?
Gregory S. Koenig's NPI number is 1255301388. It was assigned on January 23, 2006, and it is active in the NPI Registry.
What does Gregory S. Koenig specialize in?
Gregory S. Koenig is an optometrist in Fallon, Nevada. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does Gregory S. Koenig practice?
Gregory Koenig practices at 65 N Taylor St, Fallon, NV 89406. Gregory Koenig's primary practice is Dr Carl D Robertson and Dr Gregory S Koenig Optometrists in Fallon, Nevada. Dmand AI also links Gregory Koenig to 1 group practice or clinic and 1 medical group.
What is Gregory S. Koenig's office phone number?
The practice phone on file for Gregory Koenig is (775) 423-8024.
What is Gregory S. Koenig's medical license number?
Gregory Koenig holds Nevada license 321.
Does Gregory S. Koenig accept Medicare?
Yes. CMS lists Gregory Koenig as accepting Medicare assignment.
How many Medicare patients does Gregory S. Koenig see?
CMS counts 321 Medicare patients who saw Gregory Koenig in 2024, with an average age of 75.
Where did Gregory S. Koenig go to medical school?
Gregory Koenig graduated from Pacific University - College of Optometry in 1996.
Has Gregory S. Koenig received payments from drug or device companies?
CMS Open Payments shows $86 in general payments to Gregory Koenig from 1 company from 2025 to 2025. The largest total came from CooperVision Inc.
How long has Gregory S. Koenig been practicing?
Gregory Koenig graduated from medical school in 1996, 30 years ago.
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