Dr. Gregory M. Haffner, MD
- Medicare services, 2024
- 13,421
- Medicare patients, 2024
- 685
- Part D claims, 2024
- 242
- Industry payments
- $1,996
- Affiliated sites
- 2
- Practice address
- 2200 Whitney Avenue, Suite 380, Hamden, CT 06518
- Practice phone
- Call (203) 281-3636
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Endoscopy Center of Connecticut
Surgery Center - Medicare-Certified · Hamden, Connecticut
Find Dr. Haffner's professional email, personal email and mobile number
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Dr. Gregory M. Haffner is an ophthalmologist in Hamden, Connecticut
Dr. Haffner practices at Endoscopy Center of Connecticut in Hamden, Connecticut.
Dr. Haffner's NPI, 1407886450, was assigned on July 4, 2006. Dr. Haffner holds Connecticut license 043419.
- NPI
- 1407886450NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1254368327
- NPI enumeration date
- July 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (203) 281-3636
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory M. Haffner practices at Endoscopy Center of Connecticut in Hamden, Connecticut
Dr. Haffner's primary practice is Endoscopy Center of Connecticut, at 2200 Whitney Avenue, Suite 380, Hamden, CT 06518. The practice phone is (203) 281-3636.
- Endoscopy Center of Connecticut2200 Whitney Avenue, Suite 380, Hamden, CT 06518Phone(203) 281-3636
Source: Dmand AI Affiliation Data
Dr. Gregory M. Haffner is affiliated with 2 sites of care and 1 medical group
Dr. Haffner's primary practice is Endoscopy Center of Connecticut in Hamden, Connecticut. Dmand AI also links Dr. Haffner to 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory M. Haffner's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Haffner practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Endoscopy Center of Connecticut | 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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Dr. Gregory M. Haffner is one of 259 ophthalmologists in Connecticut
Ophthalmology is Dr. Haffner's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Haffner is licensed in Connecticut.
Specialties and state licenses
- Ophthalmology, ConnecticutPrimary
Ophthalmologists near Dr. Haffner
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. Gregory M. Haffner billed Medicare for 13,421 services in 2024
CMS data shows 13,421 Medicare services from Dr. Haffner across 16 procedure codes in 2024, for 685 Medicare patients. Medicare paid $1,135,067 for them. Every service was in an office.
Dr. Haffner's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 6,7432024: 9,33538%
- Tests and treatments
- 2023: 2,8132024: 2,47912%
- Surgery
- 2023: 1,3942024: 1,18915%
- Office and hospital visits
- 2023: 3602024: 3949%
- Imaging
- 2023: 252024: 244%
Dr. Haffner compared with the Connecticut median for ophthalmologists, 2024
- Dr. Haffner
- Connecticut median
- Medicare services
- 13,421vs 1,15011.7 times
- Medicare patients
- 685vs 47245% above
- Part D claims
- 183vs 66472% below
Medians across 287 ophthalmologists in Connecticut with Dmand AI profiles that report each measure.
Dr. Haffner's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Haffner and other ophthalmologists in Connecticut.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory M. Haffner treated 685 Medicare patients in 2024, average age 80
CMS counts 685 Medicare patients who saw Dr. Haffner in 2024. The largest group is 85 and over, with 240 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 18% are also on Medicaid. Their average risk score is 1.61, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Haffner's median patient age at 74, with 56% women.
Dr. Haffner's Medicare patients by age, 2024
Dr. Haffner's Medicare patients by sex, 2024
- Women39658%
- Men28942%
Chronic conditions among Dr. Haffner's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis47%
- Ischemic heart disease32%
- Diabetes31%
- Chronic kidney disease26%
- Anxiety23%
- Atrial fibrillation22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Haffner's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women56%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory M. Haffner wrote 242 Medicare Part D claims in 2024
In 2024, Dr. Haffner wrote 242 Medicare Part D claims for 88 patients. 57% of them were for generic drugs. CMS names the drug for 183 of them, across 5 drugs with 11 or more claims each, at $6,502 in total drug cost. In 2023, CMS named 223 claims across 6 drugs.
Dr. Haffner's Part D claims by kind of drug, 2024
- Generic139 claims57%
- Brand-name103 claims43%
Dr. Haffner's most prescribed drugs by claims, 2024
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, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2232024: 18318%
Drugs named by CMS: 5 in 2024, 6 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Gregory M. Haffner takes part in Medicare
Dr. Haffner accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Gregory M. Haffner received $1,996 in industry payments from 2016 to 2025
CMS Open Payments shows 89 general payments to Dr. Haffner from 14 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Regeneron Pharmaceuticals, Inc. paid the most, $566.
General payments to Dr. Haffner by program year, 2016 to 2025
Companies that paid Dr. Haffner the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Gregory M. Haffner'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 Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)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) |
| 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. Gregory M. Haffner
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. Gregory M. Haffner's NPI number?
Dr. Gregory M. Haffner's NPI number is 1407886450. It was assigned on July 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory M. Haffner?
Dr. Gregory M. Haffner is an ophthalmologist in Hamden, Connecticut. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Gregory M. Haffner practice?
Dr. Haffner practices at 2200 Whitney Avenue, Suite 380, Hamden, CT 06518. Dr. Haffner's primary practice is Endoscopy Center of Connecticut in Hamden, Connecticut. Dmand AI also links Dr. Haffner to 1 group practice or clinic and 1 medical group.
What is Dr. Gregory M. Haffner's office phone number?
The practice phone on file for Dr. Haffner is (203) 281-3636.
What is Dr. Gregory M. Haffner's medical license number?
Dr. Haffner holds Connecticut license 043419.
Does Dr. Gregory M. Haffner accept Medicare?
Yes. CMS data shows Dr. Haffner billed Medicare for 13,421 services in 2024, and Dr. Haffner accepts Medicare assignment.
How many Medicare patients does Dr. Gregory M. Haffner see?
CMS counts 685 Medicare patients who saw Dr. Haffner in 2024, with an average age of 80.
What services does Dr. Gregory M. Haffner bill to Medicare?
In 2024, Dr. Haffner's most billed Medicare services were injected or infused drug (J2777), eye exam or test (92134) and surgery: eye (67028).
What drugs does Dr. Gregory M. Haffner prescribe most?
In 2024 Medicare Part D data, Dr. Haffner's most prescribed drugs by claims were Prednisolone Acetate, Moxifloxacin and Atropine Sulfate.
Has Dr. Gregory M. Haffner received payments from drug or device companies?
CMS Open Payments shows $1,996 in general payments to Dr. Haffner from 14 companies from 2016 to 2025. The largest total came from Regeneron Pharmaceuticals, Inc.
How long has Dr. Gregory M. Haffner been practicing?
Dr. Haffner graduated from medical school in 2001, 25 years ago.
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