James Ahn
- Medicare services, 2024
- 107
- Medicare patients, 2024
- 113
- Industry payments
- $26
- Medical groups
- 2
- State license
- 1
- Practice address
- 5721 S Maryland Ave, Chicago, IL 60637
- Practice phone
- Call (773) 702-1530
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Comer Children's Hospital - Hyde Park
Chicago, Illinois
Find James 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.
James Ahn is an internist in Chicago, Illinois
James Ahn practices at Comer Children's Hospital - Hyde Park in Chicago, Illinois.
James Ahn's NPI, 1457594574, was assigned on April 20, 2009. James Ahn holds Illinois license 036125480.
- NPI
- 1457594574NPI Registry (opens in a new tab)
- NPI enumeration date
- April 20, 2009
- NPI status
- Active
- Practice phone
- (773) 702-1530
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
James Ahn practices at Comer Children's Hospital - Hyde Park in Chicago, Illinois
James Ahn's primary practice is Comer Children's Hospital - Hyde Park, at 5721 S Maryland Ave, Chicago, IL 60637 in Cook County. The practice phone is (773) 702-1530.
- Comer Children's Hospital - Hyde Park5721 S Maryland Ave, Chicago, IL 60637 · Cook CountyPhone(773) 702-1530
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
James Ahn is affiliated with 1 site of care and 2 medical groups
James Ahn's primary practice is Comer Children's Hospital - Hyde Park in Chicago, Illinois. The medical group on file is UChicago Medicine Physicians. Dmand AI also links James Ahn to 1 more medical group, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at James Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where James Ahn practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Comer Children's Hospital - Hyde Park | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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James Ahn is one of 5,652 internists in Illinois
Internal medicine is James Ahn's primary specialty in the NPI Registry, under taxonomy code 207R00000X. James Ahn is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near James Ahn
Counts of internists 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
James Ahn billed Medicare for 107 services in 2024
CMS data shows 107 Medicare services from James Ahn across 2 procedure codes in 2024, for 113 Medicare patients. Medicare paid $16,025 for them. Every service was in a facility, such as a hospital, rather than an office.
James Ahn's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1392024: 10723%
James Ahn compared with the Illinois median for internists, 2024
- James Ahn
- Illinois median
- Medicare services
- 107vs 56681% below
- Medicare patients
- 113vs 20846% below
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
James 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 James Ahn and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
James Ahn treated 113 Medicare patients in 2024, average age 71
CMS counts 113 Medicare patients who saw James Ahn in 2024. The largest group is under 65, with 33 patients. 75% of them have high blood pressure, and 73% have high cholesterol. 64% are also on Medicaid. Their average risk score is 2.97, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts James Ahn's median patient age at 67, with 60% women.
James Ahn's Medicare patients by age, 2024
James Ahn's Medicare patients by sex, 2024
- Women7365%
- Men4035%
Chronic conditions among James Ahn's Medicare patients, 2024
- High blood pressure75%
- High cholesterol73%
- Arthritis66%
- Chronic kidney disease53%
- Heart failure50%
- Diabetes49%
- Ischemic heart disease49%
- COPD40%
Share of Medicare patients with each condition. A patient can have several.
James 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 67
Patient panel by sex, all payers
- Women60%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
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James Ahn received $26 in industry payments in 2024
CMS Open Payments shows 1 general payment to James Ahn from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Mindray DS USA, Inc. paid the most, $26.
Companies that paid James Ahn the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for James 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 | 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 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) |
| 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 James 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 James Ahn's NPI number?
James Ahn's NPI number is 1457594574. It was assigned on April 20, 2009, and it is active in the NPI Registry.
What does James Ahn specialize in?
James Ahn is an internist in Chicago, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does James Ahn practice?
James Ahn practices at 5721 S Maryland Ave, Chicago, IL 60637. James Ahn's primary practice is Comer Children's Hospital - Hyde Park in Chicago, Illinois. Dmand AI also links James Ahn to 1 medical group.
What is James Ahn's office phone number?
The practice phone on file for James Ahn is (773) 702-1530.
What is James Ahn's medical license number?
James Ahn holds Illinois license 036125480.
What medical group is James Ahn part of?
James Ahn is linked to UChicago Medicine Physicians. Dmand AI links James Ahn to 1 more medical group.
Does James Ahn accept Medicare?
Yes. CMS data shows James Ahn billed Medicare for 107 services in 2024.
How many Medicare patients does James Ahn see?
CMS counts 113 Medicare patients who saw James Ahn in 2024, with an average age of 71.
What services does James Ahn bill to Medicare?
In 2024, James Ahn's most billed Medicare services were emergency department visit (99285) and emergency department visit (99284).
Has James Ahn received payments from drug or device companies?
CMS Open Payments shows $26 in general payments to James Ahn from 1 company from 2024 to 2024. The largest total came from Mindray DS USA, Inc.
How long has James Ahn been practicing?
James Ahn's NPI was assigned in 2009.
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