Dr. Joseph Ahn, MD
- Medicare services, 2024
- 76
- Medicare patients, 2024
- 128
- Part D claims, 2024
- 752
- MIPS score, 2024
- 99
- Hospital affiliations
- 1
- Practice address
- 1000 Central, Evanston, IL 60201
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Northshore University Healthsystem - Evanston Hospital - HOPD
Acute Care Hospital outpatient department · Evanston, Illinois
Find Dr. Ahn'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. Joseph Ahn is a hepatology physician in Evanston, Illinois
Dr. Ahn practices at Northshore University Healthsystem - Evanston Hospital - HOPD in Evanston, Illinois.
Dr. Ahn's NPI, 1497770416, was assigned on July 12, 2006. Dr. Ahn graduated from Northwestern University Feinberg Medical School in 2000. Dr. Ahn holds Oregon license MD157537.
- NPI
- 1497770416NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5799778882
- NPI enumeration date
- July 12, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Joseph Ahn practices at Northshore University Healthsystem - Evanston Hospital - HOPD in Evanston, Illinois
Dr. Ahn's primary practice is Northshore University Healthsystem - Evanston Hospital - HOPD, at 1000 Central, Evanston, IL 60201.
- Northshore University Healthsystem - Evanston Hospital - HOPD1000 Central, Evanston, IL 60201
Source: Dmand AI Affiliation Data
Dr. Joseph Ahn is affiliated with 2 sites of care and 2 medical groups
Dr. Ahn's primary practice is Northshore University Healthsystem - Evanston Hospital - HOPD in Evanston, Illinois. Dr. Ahn is also affiliated with Evanston Hospital. The medical group on file is Endeavor Health Medical Group. Dmand AI also links Dr. Ahn to 1 more medical group, named with a free account. Dr. Ahn's employer is on file too: a hospital.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Joseph Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahn practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northshore University Healthsystem - Evanston Hospital - HOPD | 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. Joseph Ahn is one of 20 hepatology physicians in Illinois
Hepatology is Dr. Ahn's primary specialty in the NPI Registry, under taxonomy code 207RI0008X. Dr. Ahn is licensed in Oregon.
Specialties and state licenses
- Hepatology, OregonPrimary
Hepatology physicians near Dr. Ahn
Counts of hepatology physicians 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. Joseph Ahn billed Medicare for 76 services in 2024
CMS data shows 76 Medicare services from Dr. Ahn across 2 procedure codes in 2024, for 128 Medicare patients. Medicare paid $6,052 for them.
Dr. Ahn's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 682024: 7612%
Where Dr. Ahn's Medicare services took place, 2024
- In an office2229%
- In a facility5471%
Dr. Ahn compared with the Illinois median for hepatology physicians, 2024
- Dr. Ahn
- Illinois median
- Medicare services
- 76vs 47784% below
- Medicare patients
- 128vs 24848% below
- Part D claims
- 681vs 681Close to median
Medians across 21 hepatology physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Ahn'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. Ahn and other hepatology physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Joseph Ahn treated 128 Medicare patients in 2024, average age 71
CMS counts 128 Medicare patients who saw Dr. Ahn in 2024. The largest group is 65 to 74, with 64 patients. 70% of them have high blood pressure, and 67% have high cholesterol. 23% are also on Medicaid. Their average risk score is 2.27, 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. Ahn's median patient age at 63, with 58% women.
Dr. Ahn's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Ahn's Medicare patients by sex, 2024
- Women6047%
- Men6853%
Chronic conditions among Dr. Ahn's Medicare patients, 2024
- High blood pressure70%
- High cholesterol67%
- Arthritis44%
- Diabetes42%
- Chronic kidney disease30%
- Mood disorders29%
- Anxiety27%
- Depression27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ahn's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Joseph Ahn wrote 752 Medicare Part D claims in 2024
In 2024, Dr. Ahn wrote 752 Medicare Part D claims for 143 patients. 87% of them were for generic drugs. CMS names the drug for 681 of them, across 15 drugs with 11 or more claims each, at $247,509 in total drug cost. In 2023, CMS named 809 claims across 16 drugs.
Dr. Ahn's Part D claims by kind of drug, 2024
- Generic652 claims87%
- Brand-name100 claims13%
Dr. Ahn'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. Ahn's Part D claims, 2024
- Antibiotics6%44 of 752 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: 8092024: 68116%
Drugs named by CMS: 15 in 2024, 16 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. Joseph Ahn scored 99 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 99 out of 100 for Dr. Ahn for performance year 2024, reported through an alternative payment model (APM). Dr. Ahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Ahn's MIPS scores, performance year 2024
- 99of 100Final score
- 84.3of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
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. Joseph Ahn received $141,609 in industry payments from 2016 to 2025
CMS Open Payments shows 228 general payments to Dr. Ahn from 10 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 54% of the total. Gilead Sciences, Inc. paid the most, $83,724.
General payments to Dr. Ahn by program year, 2016 to 2025
General payments to Dr. Ahn by kind, 2016 to 2025
- Consulting fees$76,61754%
- Speaker and faculty fees$43,48131%
- Travel and lodging$14,94211%
- Food and beverage$6,5695%
Companies that paid Dr. Ahn the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Joseph Ahn graduated from Northwestern University Feinberg Medical School
Dr. Ahn graduated from Northwestern University Feinberg Medical School in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Joseph Ahn'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 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) |
| 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. Joseph Ahn
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. Joseph Ahn's NPI number?
Dr. Joseph Ahn's NPI number is 1497770416. It was assigned on July 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Joseph Ahn?
Dr. Joseph Ahn is a hepatology physician in Evanston, Illinois. The primary specialty in the NPI Registry is Hepatology Physician (taxonomy code 207RI0008X).
Where does Dr. Joseph Ahn practice?
Dr. Ahn practices at 1000 Central, Evanston, IL 60201. Dr. Ahn's primary practice is Northshore University Healthsystem - Evanston Hospital - HOPD in Evanston, Illinois. Dmand AI also links Dr. Ahn to 1 medical group.
What is Dr. Joseph Ahn's medical license number?
Dr. Ahn holds Oregon license MD157537.
Which hospitals is Dr. Joseph Ahn affiliated with?
Dr. Ahn is affiliated with Evanston Hospital.
What medical group is Dr. Joseph Ahn part of?
Dr. Ahn is linked to Endeavor Health Medical Group. Dmand AI links Dr. Ahn to 1 more medical group.
Does Dr. Joseph Ahn accept Medicare?
Yes. CMS data shows Dr. Ahn billed Medicare for 76 services in 2024, and Dr. Ahn accepts Medicare assignment.
What is Dr. Joseph Ahn's MIPS score?
Dr. Ahn's MIPS final score for performance year 2024 is 99 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Joseph Ahn see?
CMS counts 128 Medicare patients who saw Dr. Ahn in 2024, with an average age of 71.
What services does Dr. Joseph Ahn bill to Medicare?
In 2024, Dr. Ahn's most billed Medicare services were office visit, established patient (99214) and hospital inpatient care (99223).
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Where did Dr. Joseph Ahn go to medical school?
Dr. Ahn graduated from Northwestern University Feinberg Medical School in 2000.
What drugs does Dr. Joseph Ahn prescribe most?
In 2024 Medicare Part D data, Dr. Ahn's most prescribed drugs by claims were Tacrolimus, Azathioprine and Ursodiol.
Has Dr. Joseph Ahn received payments from drug or device companies?
CMS Open Payments shows $141,609 in general payments to Dr. Ahn from 10 companies from 2016 to 2025. The largest total came from Gilead Sciences, Inc.
How long has Dr. Joseph Ahn been practicing?
Dr. Ahn graduated from medical school in 2000, 26 years ago.
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