Dr. Gregory S. Doren, MD
- Medicare services, 2024
- 2,857
- Medicare patients, 2024
- 577
- Part D claims, 2024
- 2,069
- Hospital affiliations
- 2
- Industry payments
- $198
- Practice address
- 3000 N Halsted St, Chicago, IL 60657
- Practice phone
- Call (312) 236-3642
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
ENT Surgery Care Center LLC
Chicago, Illinois
Find Dr. Doren's professional email, personal email and mobile number
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Dr. Gregory S. Doren is an ophthalmologist in Chicago, Illinois
Dr. Doren practices at ENT Surgery Care Center LLC in Chicago, Illinois.
Dr. Doren's NPI, 1851411847, was assigned on March 31, 2007. Dr. Doren graduated from University of Michigan Medical School in 1985. Dr. Doren holds Illinois license 036079629.
- NPI
- 1851411847NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8921022187
- NPI enumeration date
- March 31, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (312) 236-3642
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory S. Doren practices at ENT Surgery Care Center LLC in Chicago, Illinois
Dr. Doren's primary practice is ENT Surgery Care Center LLC, at 3000 N Halsted St, Chicago, IL 60657 in Cook County. The practice phone is (312) 236-3642.
- ENT Surgery Care Center LLC3000 N Halsted St, Chicago, IL 60657 · Cook CountyPhone(312) 236-3642
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory S. Doren is affiliated with 4 sites of care
Dr. Doren's primary practice is ENT Surgery Care Center LLC in Chicago, Illinois. Dr. Doren is also affiliated with Advocate Illinois Masonic Medical Center. Dmand AI also links Dr. Doren to 1 more hospital 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. Gregory S. Doren's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Doren practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| ENT Surgery Care Center LLC | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory S. Doren is one of 692 ophthalmologists in Illinois
Ophthalmology is Dr. Doren's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Doren is licensed in Illinois.
Specialties and state licenses
- Ophthalmology, IllinoisPrimary
Ophthalmologists near Dr. Doren
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 S. Doren billed Medicare for 2,857 services in 2024
CMS data shows 2,857 Medicare services from Dr. Doren across 18 procedure codes in 2024, for 577 Medicare patients. Medicare paid $203,422 for them.
Dr. Doren's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 2,2952024: 2,54911%
- Surgery
- 2023: 1212024: 17847%
- Imaging
- 2023: 1432024: 11718%
- Office and hospital visits
- 2023: 02024: 13
Where Dr. Doren's Medicare services took place, 2024
- In an office2,76897%
- In a facility893%
Dr. Doren compared with the Illinois median for ophthalmologists, 2024
- Dr. Doren
- Illinois median
- Medicare services
- 2,857vs 1,54485% above
- Medicare patients
- 577vs 577Close to median
- Part D claims
- 1,979vs 5823.4 times
Medians across 710 ophthalmologists in Illinois with Dmand AI profiles that report each measure.
Dr. Doren'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. Doren and other ophthalmologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory S. Doren treated 577 Medicare patients in 2024, average age 76
CMS counts 577 Medicare patients who saw Dr. Doren in 2024. The largest group is 65 to 74, with 240 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 18% are also on Medicaid. Their average risk score is 1.13, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Doren's median patient age at 62, with 54% women.
Dr. Doren's Medicare patients by age, 2024
Dr. Doren's Medicare patients by sex, 2024
- Women35862%
- Men21938%
Chronic conditions among Dr. Doren's Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- Arthritis37%
- Diabetes32%
- Ischemic heart disease27%
- Chronic kidney disease21%
- Mood disorders20%
- Osteoporosis19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Doren's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory S. Doren wrote 2,069 Medicare Part D claims in 2024
In 2024, Dr. Doren wrote 2,069 Medicare Part D claims for 448 patients. 57% of them were for generic drugs. CMS names the drug for 1,979 of them, across 15 drugs with 11 or more claims each, at $90,373 in total drug cost. In 2023, CMS named 2,019 claims across 14 drugs.
Dr. Doren's Part D claims by kind of drug, 2024
- Generic1,185 claims57%
- Brand-name884 claims43%
Dr. Doren'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.
Drug classes CMS tracks in Dr. Doren's Part D claims, 2024
- Antibiotics1%19 of 2,069 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,0192024: 1,9792%
Drugs named by CMS: 15 in 2024, 14 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
Dr. Gregory S. Doren ranks in the 72nd percentile for cataract surgery in Medicare
Dr. Doren accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 85 procedures of cataract surgery by Dr. Doren, more than 72% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Doren ranks in Medicare procedure volume
- Cataract surgery
- 72nd percentile85 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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Dr. Gregory S. Doren received $198 in industry payments from 2016 to 2020
CMS Open Payments shows 5 general payments to Dr. Doren from 4 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 71% of the total. Alcon Laboratories Inc paid the most, $119.
General payments to Dr. Doren by program year, 2016 to 2020
General payments to Dr. Doren by kind, 2016 to 2020
- Food and beverage$14071%
- Education$3819%
- Gifts$1910%
Companies that paid Dr. Doren the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory S. Doren graduated from University of Michigan Medical School
Dr. Doren graduated from University of Michigan Medical School in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory S. Doren'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) |
| 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 Dr. Gregory S. Doren
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 S. Doren's NPI number?
Dr. Gregory S. Doren's NPI number is 1851411847. It was assigned on March 31, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory S. Doren?
Dr. Gregory S. Doren is an ophthalmologist in Chicago, Illinois. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Gregory S. Doren practice?
Dr. Doren practices at 3000 N Halsted St, Chicago, IL 60657. Dr. Doren's primary practice is ENT Surgery Care Center LLC in Chicago, Illinois. Dmand AI also links Dr. Doren to 1 hospital and 1 physician office.
What is Dr. Gregory S. Doren's office phone number?
The practice phone on file for Dr. Doren is (312) 236-3642.
What is Dr. Gregory S. Doren's medical license number?
Dr. Doren holds Illinois license 036079629.
Which hospitals is Dr. Gregory S. Doren affiliated with?
Dr. Doren is affiliated with Advocate Illinois Masonic Medical Center. Dmand AI links Dr. Doren to 1 more hospital.
Does Dr. Gregory S. Doren accept Medicare?
Yes. CMS data shows Dr. Doren billed Medicare for 2,857 services in 2024, and Dr. Doren accepts Medicare assignment.
How many Medicare patients does Dr. Gregory S. Doren see?
CMS counts 577 Medicare patients who saw Dr. Doren in 2024, with an average age of 76.
What services does Dr. Gregory S. Doren bill to Medicare?
In 2024, Dr. Doren's most billed Medicare services were eye exam or test (92014), eye exam or test (92134) and eye exam or test (92083).
Where did Dr. Gregory S. Doren go to medical school?
Dr. Doren graduated from University of Michigan Medical School in 1985.
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What drugs does Dr. Gregory S. Doren prescribe most?
In 2024 Medicare Part D data, Dr. Doren's most prescribed drugs by claims were Latanoprost, Prednisolone Acetate and Dorzolamide HCl.
Has Dr. Gregory S. Doren received payments from drug or device companies?
CMS Open Payments shows $198 in general payments to Dr. Doren from 4 companies from 2016 to 2020. The largest total came from Alcon Laboratories Inc.
How long has Dr. Gregory S. Doren been practicing?
Dr. Doren graduated from medical school in 1985, 41 years ago.
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