Dr. John C. Flanagan, MD
- Medicare services, 2024
- 572
- Medicare patients, 2024
- 324
- Part D claims, 2024
- 287
- Hospital affiliations
- 3
- Industry payments
- $20
- Practice address
- 3201 Kings Hwy, Brooklyn, NY 11234
- Practice phone
- Call (646) 605-6009
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mount Sinai - Brooklyn
Brooklyn, New York
Find Dr. Flanagan'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. John C. Flanagan is an ophthalmologist in Brooklyn, New York
Dr. Flanagan practices at Mount Sinai - Brooklyn in Brooklyn, New York.
Dr. Flanagan's NPI, 1992735773, was assigned on July 4, 2006. Dr. Flanagan graduated from Icahn School Of Medicine At Mount Sinai in 1978. Dr. Flanagan holds New York license 138470.
- NPI
- 1992735773NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1951388511
- NPI enumeration date
- July 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (646) 605-6009
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 74
- Medical school graduation
- 1978
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John C. Flanagan practices at Mount Sinai - Brooklyn in Brooklyn, New York
Dr. Flanagan's primary practice is Mount Sinai - Brooklyn, at 3201 Kings Hwy, Brooklyn, NY 11234 in Kings County. The practice phone is (646) 605-6009.
- Mount Sinai - Brooklyn3201 Kings Hwy, Brooklyn, NY 11234 · Kings CountyPhone(646) 605-6009
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John C. Flanagan is affiliated with 5 sites of care and 1 medical group
Dr. Flanagan's primary practice is Mount Sinai - Brooklyn in Brooklyn, New York. Dr. Flanagan is also affiliated with The Mount Sinai Hospital. The medical group on file is Mount Sinai Institute for Liver Medicine. Dmand AI also links Dr. Flanagan to 2 more hospitals and 1 physician office, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John C. Flanagan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Flanagan practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mount Sinai - Brooklyn | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John C. Flanagan is one of 1,467 ophthalmologists in New York
Ophthalmology is Dr. Flanagan's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Flanagan is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Flanagan's licenses on file in 3 states: New York, New Jersey and Connecticut.
Specialties and state licenses
- Ophthalmology, New YorkPrimary
- New Jersey license
- Connecticut license
Clinical focus
Dmand AI lists age-related macular degeneration, cataract, cataract surgery with lens implant, dry eye, eyelid inflammation, glaucoma, glaucoma surgery and secondary membranaous cataract surgery among the conditions Dr. Flanagan treats.
Ophthalmologists near Dr. Flanagan
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. John C. Flanagan billed Medicare for 572 services in 2024
CMS data shows 572 Medicare services from Dr. Flanagan across 9 procedure codes in 2024, for 324 Medicare patients. Medicare paid $36,089 for them.
Dr. Flanagan's Medicare services by type, 2024
- Tests and treatments407
- Office and hospital visits130
- Surgery23
- Imaging12
Where Dr. Flanagan's Medicare services took place, 2024
- In an office26446%
- In a facility30854%
Dr. Flanagan compared with the New York median for ophthalmologists, 2024
- Dr. Flanagan
- New York median
- Medicare services
- 572vs 1,25855% below
- Medicare patients
- 324vs 43626% below
- Part D claims
- 219vs 64766% below
Medians across 1,557 ophthalmologists in New York with Dmand AI profiles that report each measure.
Dr. Flanagan'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.
Need commercial claims for Dr. Flanagan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Flanagan and other ophthalmologists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John C. Flanagan treated 324 Medicare patients in 2024, average age 74
CMS counts 324 Medicare patients who saw Dr. Flanagan in 2024. The largest group is 65 to 74, with 129 patients. 73% of them have high cholesterol, and 72% have high blood pressure. 38% are also on Medicaid. Their average risk score is 1.36, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Flanagan's median patient age at 59, with 56% women.
Dr. Flanagan's Medicare patients by age, 2024
Dr. Flanagan's Medicare patients by sex, 2024
- Women18758%
- Men13742%
Chronic conditions among Dr. Flanagan's Medicare patients, 2024
- High cholesterol73%
- High blood pressure72%
- Arthritis40%
- Diabetes39%
- Ischemic heart disease29%
- Chronic kidney disease22%
- Anxiety19%
- Mood disorders18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Flanagan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women56%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John C. Flanagan wrote 287 Medicare Part D claims in 2024
In 2024, Dr. Flanagan wrote 287 Medicare Part D claims for 41 patients. 74% of them were for generic drugs. CMS names the drug for 219 of them, across 7 drugs with 11 or more claims each, at $33,566 in total drug cost.
Dr. Flanagan's Part D claims by kind of drug, 2024
- Generic212 claims74%
- Brand-name75 claims26%
Dr. Flanagan'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.
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. John C. Flanagan takes part in Medicare
Dr. Flanagan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Cataract surgery: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. John C. Flanagan received $20 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Flanagan from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $20.
Companies that paid Dr. Flanagan the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John C. Flanagan has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Flanagan.
Awards and honors for Dr. Flanagan
- Undated
- AAO Fellow
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. John C. Flanagan graduated from Icahn School Of Medicine At Mount Sinai
Dr. Flanagan graduated from Icahn School Of Medicine At Mount Sinai in 1978. Dr. Flanagan is a member of AAO and ACS.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. John C. Flanagan accepts plans from 19 insurance carriers
Dr. Flanagan is in network with 19 carriers, including Elevance, Aetna and Excellus BlueCross BlueShield. Medicare plans come from the most carriers, 12. Check the plan with the practice before a visit.
- Elevance
- Aetna
- Excellus BlueCross BlueShield
- United Healthcare
- Blue Cross Blue Shield of Michigan
- HCSC
- Humana
- Aspirus Health Plan
- +11 more carriersWith a free account
Plan types Dr. Flanagan accepts, by number of carriers
- Medicare12
- PPO12
- HMO10
- EPO6
- POS6
- Medicaid2
Source: Dmand AI Insurance Network Data
Sources for Dr. John C. Flanagan'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 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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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 Dr. John C. Flanagan
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. John C. Flanagan's NPI number?
Dr. John C. Flanagan's NPI number is 1992735773. It was assigned on July 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John C. Flanagan?
Dr. John C. Flanagan is an ophthalmologist in Brooklyn, New York. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. John C. Flanagan practice?
Dr. Flanagan practices at 3201 Kings Hwy, Brooklyn, NY 11234. Dr. Flanagan's primary practice is Mount Sinai - Brooklyn in Brooklyn, New York. Dmand AI also links Dr. Flanagan to 2 hospitals and 1 physician office.
What is Dr. John C. Flanagan's office phone number?
The practice phone on file for Dr. Flanagan is (646) 605-6009.
What is Dr. John C. Flanagan's medical license number?
Dr. Flanagan holds New York license 138470, one of the licenses on file in 3 states.
Which states has Dr. John C. Flanagan been licensed in?
Dmand AI has state licenses on file for Dr. Flanagan in New York (1979 to 2027), New Jersey (1979 to 2027) and Connecticut (1983 to 2018).
Which hospitals is Dr. John C. Flanagan affiliated with?
Dr. Flanagan is affiliated with The Mount Sinai Hospital. Dmand AI links Dr. Flanagan to 2 more hospitals.
What medical group is Dr. John C. Flanagan part of?
Dr. Flanagan is linked to Mount Sinai Institute for Liver Medicine.
Does Dr. John C. Flanagan accept Medicare?
Yes. CMS data shows Dr. Flanagan billed Medicare for 572 services in 2024, and Dr. Flanagan accepts Medicare assignment.
How many Medicare patients does Dr. John C. Flanagan see?
CMS counts 324 Medicare patients who saw Dr. Flanagan in 2024, with an average age of 74.
Show 7 more questionsShow fewer questions
Is Dr. John C. Flanagan board certified?
Yes. Dr. Flanagan is board certified in ophthalmology by the American Board of Ophthalmology.
What services does Dr. John C. Flanagan bill to Medicare?
In 2024, Dr. Flanagan's most billed Medicare services were eye exam or test (92012), eye exam or test (92202) and office visit, established patient (99214).
Where did Dr. John C. Flanagan go to medical school?
Dr. Flanagan graduated from Icahn School Of Medicine At Mount Sinai in 1978.
What drugs does Dr. John C. Flanagan prescribe most?
In 2024 Medicare Part D data, Dr. Flanagan's most prescribed drugs by claims were Latanoprost, Brimonidine Tartrate and Timolol Maleate.
Has Dr. John C. Flanagan received payments from drug or device companies?
CMS Open Payments shows $20 in general payments to Dr. Flanagan from 1 company from 2025 to 2025. The largest total came from Amgen Inc.
How long has Dr. John C. Flanagan been practicing?
Dr. Flanagan graduated from medical school in 1978, 48 years ago.
What insurance does Dr. John C. Flanagan accept?
Dr. Flanagan is in network with 19 carriers, including Elevance, Aetna and Excellus BlueCross BlueShield. Medicare plans come from the most carriers, 12. Check the plan with the practice before a visit.
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