J Cataract Refract Surg
Anti-Bacterial AgentsDrug CombinationsEndophthalmitis
Dr. John M. Hahn, MD
NPI1548260961PAC ID6406806140
- Medicare services, 2024
- 4,146
- Medicare patients, 2024
- 1,517
- Part D claims, 2024
- 1,687
- Publications
- 2
- MIPS score, 2024
- 37
- Practice address
- 100 East Lefevre Road, Sterling, IL 61081
- Practice phone
- Call (815) 625-0400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hahn's professional email, personal email and mobile number
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Dr. John M. Hahn is an ophthalmologist in Sterling, Illinois
Dr. Hahn practices at CGH Medical Center in Sterling, Illinois, part of City of Sterling.
Dr. Hahn's NPI, 1548260961, was assigned on July 28, 2005. Dr. Hahn graduated from Northwestern University Feinberg Medical School in 1997. Dr. Hahn holds Illinois license 036-124630.
NPI and contact details
- NPI
- 1548260961NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6406806140
- NPI enumeration date
- July 28, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (815) 625-0400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 55
- Medical school graduation
- 1997
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John M. Hahn practices at CGH Medical Center in Sterling, Illinois
Dr. Hahn's primary practice is CGH Medical Center, at 100 East Lefevre Road, Sterling, IL 61081 in Whiteside County. The practice phone is (815) 625-0400.
- CGH Medical Center100 East Lefevre Road, Sterling, IL 61081 · Whiteside CountyPhone(815) 625-0400
Source: Dmand AI Affiliation Data
Dr. John M. Hahn is affiliated with 3 sites of care and 1 medical group
Dr. Hahn's primary practice is CGH Medical Center in Sterling, Illinois, part of City of Sterling. Dr. Hahn is also affiliated with Morrison Community Hospital. The medical group on file is CGH Medical Center. Dmand AI also links Dr. Hahn to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John M. Hahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hahn practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| CGH Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across City of Sterling and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John M. Hahn is one of 692 ophthalmologists in Illinois
Ophthalmology is Dr. Hahn's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Hahn is licensed in Illinois.
Specialties and state licenses
- Ophthalmology, IllinoisPrimary
Ophthalmologists near Dr. Hahn
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 M. Hahn billed Medicare for 4,146 services in 2024
CMS data shows 4,146 Medicare services from Dr. Hahn across 13 procedure codes in 2024, for 1,517 Medicare patients. Medicare paid $297,384 for them.
Medicare services, 20244,146
Medicare patients1,517
Paid by Medicare$297,384
Procedure codes13
Dr. Hahn's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2,0582024: 1,9625%
- Surgery
- 2023: 8712024: 1,11828%
- Tests and treatments
- 2023: 1,1462024: 1,0667%
Where Dr. Hahn's Medicare services took place, 2024
- In an office3,12075%
- In a facility1,02625%
Dr. Hahn compared with the Illinois median for ophthalmologists, 2024
- Dr. Hahn
- Illinois median
- Medicare services
- 4,146vs 1,5442.7 times
- Medicare patients
- 1,517vs 5772.6 times
- Part D claims
- 1,553vs 5822.7 times
Medians across 710 ophthalmologists in Illinois with Dmand AI profiles that report each measure.
Dr. Hahn'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. Hahn and other ophthalmologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John M. Hahn treated 1,517 Medicare patients in 2024, average age 78
CMS counts 1,517 Medicare patients who saw Dr. Hahn in 2024. The largest group is 75 to 84, with 669 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 7% are also on Medicaid. Their average risk score is 0.98, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Hahn's median patient age at 78, with 63% women.
Medicare patients, 20241,517
Average age78
Average risk score0.98
Also on Medicaid7%
Dr. Hahn's Medicare patients by age, 2024
Dr. Hahn's Medicare patients by sex, 2024
- Women94262%
- Men57538%
Chronic conditions among Dr. Hahn's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis39%
- Diabetes31%
- Ischemic heart disease30%
- Chronic kidney disease20%
- Anxiety19%
- Atrial fibrillation17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hahn'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
- Women63%
- Men37%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John M. Hahn wrote 1,687 Medicare Part D claims in 2024
In 2024, Dr. Hahn wrote 1,687 Medicare Part D claims for 416 patients. 69% of them were for generic drugs. CMS names the drug for 1,553 of them, across 19 drugs with 11 or more claims each, at $100,241 in total drug cost. In 2023, CMS named 1,468 claims across 23 drugs.
Part D claims, 20241,687
Drugs named by CMS19
Total drug cost$100,241
Part D patients416
Dr. Hahn's Part D claims by kind of drug, 2024
- Generic1,165 claims69%
- Brand-name522 claims31%
Dr. Hahn'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. Hahn's Part D claims, 2024
- Antibiotics3%50 of 1,687 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: 1,4682024: 1,5536%
Drugs named by CMS: 19 in 2024, 23 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. John M. Hahn scored 37 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 37 out of 100 for Dr. Hahn for performance year 2024, reported individually. Dr. Hahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 510 procedures of cataract surgery by Dr. Hahn, more than 95% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Hahn's MIPS scores, performance year 2024
- 37of 100Final score
- 0of 100Quality
- 40of 100Improvement Activities
- 73of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Hahn ranks in Medicare procedure volume
- Cataract surgery
- 95th percentile510 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. John M. Hahn has 2 publications on record
Dmand AI links 2 papers to Dr. Hahn, published from 2011 to 2018. The most frequent topics are Phacoemulsification. Dr. Hahn has published most often in J Cataract Refract Surg. Dr. Hahn's most frequent co-authors are Jeffrey Alan Brown, MD, Kamal Kishore, MD and Sheridan Lam, MD.
Papers2
Years published2011 to 2018
Topics Dr. Hahn writes about most
- Phacoemulsification
Dr. Hahn's most frequent co-authors
Recent publications by Dr. Hahn
J Cataract Refract Surg
BiometryCorneaLens Implantation, Intraocular
See who Dr. Hahn researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hahn works with, so you can find a warm path to the right ophthalmologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John M. Hahn received $370 in industry payments from 2017 to 2025
CMS Open Payments shows 19 general payments to Dr. Hahn from 10 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $83.
General payments to Dr. Hahn by program year, 2017 to 2025
Companies that paid Dr. Hahn the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John M. Hahn graduated from Northwestern University Feinberg Medical School
Dr. Hahn graduated from Northwestern University Feinberg Medical School in 1997.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John M. Hahn'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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. John M. Hahn
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 M. Hahn's NPI number?
Dr. John M. Hahn's NPI number is 1548260961. It was assigned on July 28, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John M. Hahn?
Dr. John M. Hahn is an ophthalmologist in Sterling, Illinois. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. John M. Hahn practice?
Dr. Hahn practices at 100 East Lefevre Road, Sterling, IL 61081. Dr. Hahn's primary practice is CGH Medical Center in Sterling, Illinois, part of City of Sterling. Dmand AI also links Dr. Hahn to 1 group practice or clinic.
What is Dr. John M. Hahn's office phone number?
The practice phone on file for Dr. Hahn is (815) 625-0400.
What is Dr. John M. Hahn's medical license number?
Dr. Hahn holds Illinois license 036-124630.
Which hospitals is Dr. John M. Hahn affiliated with?
Dr. Hahn practices at CGH Medical Center in Sterling, Illinois. Dr. Hahn is also affiliated with Morrison Community Hospital.
What medical group is Dr. John M. Hahn part of?
Dr. Hahn is linked to CGH Medical Center.
Does Dr. John M. Hahn accept Medicare?
Yes. CMS data shows Dr. Hahn billed Medicare for 4,146 services in 2024, and Dr. Hahn accepts Medicare assignment.
What is Dr. John M. Hahn's MIPS score?
Dr. Hahn's MIPS final score for performance year 2024 is 37 out of 100, reported individually.
How many Medicare patients does Dr. John M. Hahn see?
CMS counts 1,517 Medicare patients who saw Dr. Hahn in 2024, with an average age of 78.
Show 7 more questionsShow fewer questions
What services does Dr. John M. Hahn bill to Medicare?
In 2024, Dr. Hahn's most billed Medicare services were office visit, established patient (99213), surgery: eye (66984) and eye exam or test (92136).
Where did Dr. John M. Hahn go to medical school?
Dr. Hahn graduated from Northwestern University Feinberg Medical School in 1997.
What drugs does Dr. John M. Hahn prescribe most?
In 2024 Medicare Part D data, Dr. Hahn's most prescribed drugs by claims were Latanoprost, Timolol Maleate and Dorzolamide-Timolol.
Has Dr. John M. Hahn received payments from drug or device companies?
CMS Open Payments shows $370 in general payments to Dr. Hahn from 10 companies from 2017 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Dr. John M. Hahn been practicing?
Dr. Hahn graduated from medical school in 1997, 29 years ago.
Does Dr. John M. Hahn do research?
Dmand AI links 2 publications to Dr. Hahn, published from 2011 to 2018.
Who does Dr. John M. Hahn publish with?
Dr. Hahn's most frequent co-authors are Jeffrey Alan Brown, MD (1 shared paper), Kamal Kishore, MD (1 shared paper) and Sheridan Lam, MD (1 shared paper).
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