Dr. Gary I. Markowitz, MD
- Medicare services, 2017
- 3,400
- Part D claims, 2019
- 63
- Industry payments
- $54
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 833 S Governors Ave, Dover, DE 19904-4158
- Practice phone
- Call (302) 674-1121
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Delaware Eye Institute
Eye care practice · Dover, Delaware
Find Dr. Markowitz'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.
Dr. Gary I. Markowitz is an ophthalmologist in Dover, Delaware
Dr. Markowitz practices at Delaware Eye Institute in Dover, Delaware.
Dr. Markowitz's NPI, 1316912983, was assigned on February 17, 2006. Dr. Markowitz holds Delaware license C10002292.
- NPI
- 1316912983NPI Registry (opens in a new tab)
- NPI enumeration date
- February 17, 2006
- NPI status
- Active
- Practice phone
- (302) 674-1121
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gary I. Markowitz practices at Delaware Eye Institute in Dover, Delaware
Dr. Markowitz's primary practice is Delaware Eye Institute, at 833 S Governors Ave, Dover, DE 19904-4158. The practice phone is (302) 674-1121.
- Delaware Eye Institute833 S Governors Ave, Dover, DE 19904-4158Phone(302) 674-1121
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gary I. Markowitz is affiliated with 1 site of care and 1 medical group
Dr. Markowitz's primary practice is Delaware Eye Institute in Dover, Delaware. Dmand AI also links Dr. Markowitz to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Gary I. Markowitz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Markowitz practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Delaware Eye Institute | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Gary I. Markowitz is one of 62 ophthalmologists in Delaware
Ophthalmology is Dr. Markowitz's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Markowitz is licensed in Delaware.
Specialties and state licenses
- Ophthalmology, DelawarePrimary
Ophthalmologists near Dr. Markowitz
Counts of ophthalmologists 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
Dr. Gary I. Markowitz billed Medicare for 3,400 services in 2017
CMS data shows 3,400 Medicare services from Dr. Markowitz across 14 procedure codes in 2017. Medicare paid $305,263 for them.
Dr. Markowitz's Medicare services by type, 2016 to 2017
- 2016
- 2017
- Tests and treatments
- 2016: 3,3682017: 1,55554%
- Office and hospital visits
- 2016: 5,0902017: 1,53570%
- Surgery
- 2016: 1,0692017: 22079%
- Drugs given in the office
- 2016: 8142017: 9089%
- Imaging
- 2016: 512017: 0100%
Where Dr. Markowitz's Medicare services took place, 2017
- In an office3,25696%
- In a facility1444%
Dr. Markowitz compared with the Delaware median for ophthalmologists, 2017
- Dr. Markowitz
- Delaware median
- Medicare services
- 3,400vs 2,89318% above
- Part D claims
- 63vs 53488% below
Medians across 61 ophthalmologists in Delaware with Dmand AI profiles that report each measure.
Dr. Markowitz's most billed Medicare procedure codes, 2017
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Markowitz?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Markowitz and other ophthalmologists in Delaware.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gary I. Markowitz's patients have a median age of 78
Across all payers, Dmand AI patient panel data puts Dr. Markowitz's median patient age at 78, with 80% women.
Dr. Markowitz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women80%
- Men20%
Source: Dmand AI Patient Panel Data
Dr. Gary I. Markowitz wrote 63 Medicare Part D claims in 2019
In 2019, Dr. Markowitz wrote 63 Medicare Part D claims. They cover 3 drugs, with $1,913 in total drug cost. In 2018, CMS named 536 claims across 14 drugs.
Dr. Markowitz's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 5362019: 6388%
Drugs named by CMS: 3 in 2019, 14 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gary I. Markowitz received $54 in industry payments in 2016
CMS Open Payments shows 2 general payments to Dr. Markowitz from 2 drug and device companies in 2016. Education make up the largest share, 70% of the total. Shire North American Group Inc paid the most, $38.
General payments to Dr. Markowitz by kind, 2016 to 2016
- Education$3870%
- Food and beverage$1630%
Companies that paid Dr. Markowitz the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Gary I. Markowitz'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 | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Dr. Gary I. Markowitz
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gary I. Markowitz's NPI number?
Dr. Gary I. Markowitz's NPI number is 1316912983. It was assigned on February 17, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gary I. Markowitz?
Dr. Gary I. Markowitz is an ophthalmologist in Dover, Delaware. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Gary I. Markowitz practice?
Dr. Markowitz practices at 833 S Governors Ave, Dover, DE 19904-4158. Dr. Markowitz's primary practice is Delaware Eye Institute in Dover, Delaware. Dmand AI also links Dr. Markowitz to 1 medical group, and a free account names each one.
What is Dr. Gary I. Markowitz's office phone number?
The practice phone on file for Dr. Markowitz is (302) 674-1121. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. Gary I. Markowitz's email address?
Dmand AI checks professional and personal email addresses for Dr. Markowitz through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. Gary I. Markowitz's medical license number?
Dr. Markowitz holds Delaware license C10002292.
What medical group is Dr. Gary I. Markowitz part of?
Dmand AI links Dr. Markowitz to 1 medical group. A free account names the group, with the clinicians and leaders there.
Who does Dr. Gary I. Markowitz practice with?
Dmand AI links 18 HCPs to Dr. Markowitz's primary medical group, 9 of them ophthalmologists. A free account lists them, with verified contacts.
Does Dr. Gary I. Markowitz accept Medicare?
Yes. CMS data shows Dr. Markowitz billed Medicare for 3,400 services in 2017.
What services does Dr. Gary I. Markowitz bill to Medicare?
In 2017, Dr. Markowitz's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and eye exam or test (92134).
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What drugs does Dr. Gary I. Markowitz prescribe most?
In 2019 Medicare Part D data, Dr. Markowitz's most prescribed drugs by claims were Dorzolamide-Timolol, Latanoprost and Timolol Maleate.
Has Dr. Gary I. Markowitz received payments from drug or device companies?
CMS Open Payments shows $54 in general payments to Dr. Markowitz from 2 companies from 2016 to 2016. The largest total came from Shire North American Group Inc.
How long has Dr. Gary I. Markowitz been practicing?
Dr. Markowitz's NPI was assigned in 2006.
What EHR does Dr. Gary I. Markowitz's practice use?
Dmand AI tracks the EHR system at Delaware Eye Institute and at 1 medical group. The vendor and product are available with a free Dmand AI account.
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