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Dr. I-Wen Chang, MD
NPI1912034471PAC ID5496847071
- Medicare services, 2024
- 820
- Medicare patients, 2024
- 218
- Part D claims, 2024
- 1,532
- Publications
- 3
- Hospital affiliations
- 4
- Practice address
- 1000 Johnson Ferry Road, NE, Atlanta, GA 30342
- Practice phone
- Call (404) 851-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Chang'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. I-Wen Chang is a hematologist and oncologist in Atlanta, Georgia
Dr. Chang practices at Northside Hospital Atlanta in Atlanta, Georgia, part of Northside Hospital.
Dr. Chang's NPI, 1912034471, was assigned on February 28, 2007. Dr. Chang holds Georgia license 079105.
NPI and contact details
- NPI
- 1912034471NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5496847071
- NPI enumeration date
- February 28, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (404) 851-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. I-Wen Chang practices at Northside Hospital Atlanta in Atlanta, Georgia
Dr. Chang's primary practice is Northside Hospital Atlanta, at 1000 Johnson Ferry Road, NE, Atlanta, GA 30342 in Fulton County. The practice phone is (404) 851-8000.
- Northside Hospital Atlanta1000 Johnson Ferry Road, NE, Atlanta, GA 30342 · Fulton CountyPhone(404) 851-8000
Source: Dmand AI Affiliation Data
Dr. I-Wen Chang is affiliated with 8 sites of care and 5 medical groups
Dr. Chang's primary practice is Northside Hospital Atlanta in Atlanta, Georgia, part of Northside Hospital. Dr. Chang is also affiliated with Northside Hospital Forsyth. The medical group on file is Northside Hospital Atlanta. Dmand AI also links Dr. Chang to 2 more hospitals, 4 medical groups, 3 group practices and clinics and 1 ambulatory surgery center, each named with a free account.
Northside Hospital ForsythNorthside Hospital Atlanta2 hospitalsNames with a free account4 medical groupsNames with a free account3 group practices and clinicsNames with a free account1 ambulatory surgery centerName with a free account
See all 13 affiliations for Dr. ChangSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. I-Wen Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northside Hospital Atlanta | Available with a free account |
| +7 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. I-Wen Chang is one of 379 hematologists and oncologists in Georgia
Hematology and oncology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dmand AI has Dr. Chang's licenses on file in 2 states: Georgia and North Carolina.
Specialties and state licenses
- Hematology and oncology, GeorgiaPrimary
- North Carolina license
Hematologists and oncologists near Dr. Chang
Counts of hematologists and oncologists with a Dmand AI profile, by place and practice. Each opens the list.
379hematologists and oncologists in Georgia193hematologists and oncologists in Atlanta82hematologists and oncologists at Northside Hospital Atlanta
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. I-Wen Chang billed Medicare for 820 services in 2024
CMS data shows 820 Medicare services from Dr. Chang across 8 procedure codes in 2024, for 218 Medicare patients. Medicare paid $47,833 for them.
Medicare services, 2024820
Medicare patients218
Paid by Medicare$47,833
Procedure codes8
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4822024: 66237%
- Other services
- 2023: 02024: 158
Where Dr. Chang's Medicare services took place, 2024
- In an office61275%
- In a facility20825%
Dr. Chang compared with the Georgia median for hematologists and oncologists, 2024
- Dr. Chang
- Georgia median
- Medicare services
- 820vs 69119% above
- Medicare patients
- 218vs 2357% below
- Part D claims
- 1,281vs 67590% above
Medians across 350 hematologists and oncologists in Georgia with Dmand AI profiles that report each measure.
Dr. Chang'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. Chang?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other hematologists and oncologists in Georgia.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. I-Wen Chang treated 218 Medicare patients in 2024, average age 75
CMS counts 218 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 84 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 18% are also on Medicaid. Their average risk score is 2.03, 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. Chang's median patient age at 65, with 66% women.
Medicare patients, 2024218
Average age75
Average risk score2.03
Also on Medicaid18%
Dr. Chang's Medicare patients by age, 2024
Dr. Chang's Medicare patients by sex, 2024
- Women13361%
- Men8539%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Cancer48%
- Arthritis45%
- Diabetes38%
- Chronic kidney disease34%
- Ischemic heart disease34%
- Anxiety26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women66%
- Men33%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. I-Wen Chang wrote 1,532 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 1,532 Medicare Part D claims for 223 patients. 72% of them were for generic drugs. CMS names the drug for 1,281 of them, across 49 drugs with 11 or more claims each, at $4,469,661 in total drug cost. In 2023, CMS named 917 claims across 39 drugs.
Part D claims, 20241,532
Drugs named by CMS49
Total drug cost$4.5M
Part D patients223
Dr. Chang's Part D claims by kind of drug, 2024
- Generic1,106 claims72%
- Brand-name426 claims28%
Dr. Chang'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. Chang's Part D claims, 2024
- Opioids11%171 of 1,532 claims
- Antibiotics2%27 of 1,532 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: 9172024: 1,28140%
Drugs named by CMS: 49 in 2024, 39 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
How Dr. I-Wen Chang takes part in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. I-Wen Chang has 3 publications on record
Dmand AI links 3 papers to Dr. Chang, published from 2019 to 2021. Dr. Chang's most frequent co-authors are Charles David Blanke, MD, Charles Stewart Fuchs, MD, MPH and Heinz-Josef Lenz, MD.
Papers3
Years published2019 to 2021
Dr. Chang's papers by year, 2019 to 2021
Dr. Chang's most frequent co-authors
- Charles David Blanke, MD3 shared papers
- Charles Stewart Fuchs, MD, MPH3 shared papers
- Heinz-Josef Lenz, MD3 shared papers
Recent publications by Dr. Chang
See who Dr. Chang researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chang works with, so you can find a warm path to the right hematologists and oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. I-Wen Chang received $10,093 in industry payments from 2016 to 2025
CMS Open Payments shows 396 general payments to Dr. Chang from 64 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 97% of the total. Janssen Pharmaceuticals, Inc paid the most, $825.
General payments to Dr. Chang by program year, 2016 to 2025
General payments to Dr. Chang by kind, 2016 to 2025
$10.1Kin total
- Food and beverage$9,76797%
- Education$3253%
Companies that paid Dr. Chang the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. I-Wen Chang'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) |
| 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) |
| 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. I-Wen Chang
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. I-Wen Chang's NPI number?
Dr. I-Wen Chang's NPI number is 1912034471. It was assigned on February 28, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. I-Wen Chang?
Dr. I-Wen Chang is a hematologist and oncologist in Atlanta, Georgia. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. I-Wen Chang practice?
Dr. Chang practices at 1000 Johnson Ferry Road, NE, Atlanta, GA 30342. Dr. Chang's primary practice is Northside Hospital Atlanta in Atlanta, Georgia, part of Northside Hospital. Dmand AI also links Dr. Chang to 2 hospitals, 4 medical groups, 3 group practices and clinics and 1 ambulatory surgery center.
What is Dr. I-Wen Chang's office phone number?
The practice phone on file for Dr. Chang is (404) 851-8000.
What is Dr. I-Wen Chang's medical license number?
Dr. Chang holds Georgia license 079105, one of the licenses on file in 2 states.
Which states has Dr. I-Wen Chang been licensed in?
Dmand AI has state licenses on file for Dr. Chang in Georgia and North Carolina.
Which hospitals is Dr. I-Wen Chang affiliated with?
Dr. Chang practices at Northside Hospital Atlanta in Atlanta, Georgia. Dr. Chang is also affiliated with Northside Hospital Forsyth. Dmand AI links Dr. Chang to 2 more hospitals.
What medical group is Dr. I-Wen Chang part of?
Dr. Chang is linked to Northside Hospital Atlanta. Dmand AI links Dr. Chang to 4 more medical groups.
Does Dr. I-Wen Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 820 services in 2024, and Dr. Chang accepts Medicare assignment.
How many Medicare patients does Dr. I-Wen Chang see?
CMS counts 218 Medicare patients who saw Dr. Chang in 2024, with an average age of 75.
Show 6 more questionsShow fewer questions
What services does Dr. I-Wen Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and medicare service (G2211).
What drugs does Dr. I-Wen Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Ondansetron ODT, Revlimid and Anastrozole.
Has Dr. I-Wen Chang received payments from drug or device companies?
CMS Open Payments shows $10,093 in general payments to Dr. Chang from 64 companies from 2016 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. I-Wen Chang been practicing?
Dr. Chang graduated from medical school in 2001, 25 years ago.
Does Dr. I-Wen Chang do research?
Dmand AI links 3 publications to Dr. Chang, published from 2019 to 2021.
Who does Dr. I-Wen Chang publish with?
Dr. Chang's most frequent co-authors are Charles David Blanke, MD (3 shared papers), Charles Stewart Fuchs, MD, MPH (3 shared papers) and Heinz-Josef Lenz, MD (3 shared papers).
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