Dr. Won S. Chang, MD
- Medicare services, 2024
- 2,485
- Medicare patients, 2024
- 104
- Part D claims, 2024
- 78
- Hospital affiliations
- 3
- Industry payments
- $1,242
- Practice address
- 559 West Germantown Pike, East Norriton, PA 19403
- Practice phone
- Call (484) 662-1000
- 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
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Dr. Won S. Chang is a radiation oncologist in Norristown, Pennsylvania
Dr. Chang practices at Jefferson Einstein Montgomery Hospital in East Norriton, Pennsylvania, part of Thomas Jefferson University.
Dr. Chang's NPI, 1992787618, was assigned on November 17, 2005. Dr. Chang graduated from Temple University School of Medicine in 1995. Dr. Chang holds Pennsylvania license MD071181L.
- NPI
- 1992787618NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3173650033
- NPI enumeration date
- November 17, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (484) 662-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Won S. Chang practices at Jefferson Einstein Montgomery Hospital in East Norriton, Pennsylvania
Dr. Chang's primary practice is Jefferson Einstein Montgomery Hospital, at 559 West Germantown Pike, East Norriton, PA 19403 in Montgomery County. The practice phone is (484) 662-1000.
- Jefferson Einstein Montgomery Hospital559 West Germantown Pike, East Norriton, PA 19403 · Montgomery CountyPhone(484) 662-1000
Source: Dmand AI Affiliation Data
Dr. Won S. Chang is affiliated with 4 sites of care and 2 medical groups
Dr. Chang's primary practice is Jefferson Einstein Montgomery Hospital in East Norriton, Pennsylvania, part of Thomas Jefferson University. Dr. Chang is also affiliated with Jefferson Einstein Philadelphia Hospital. The medical group on file is Einstein Gastroenterology Associates. Dmand AI also links Dr. Chang to 1 more hospital, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Won S. Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Jefferson Einstein Montgomery Hospital | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Thomas Jefferson University and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Won S. Chang is one of 304 radiation oncologists in Pennsylvania
Radiation oncology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dr. Chang is licensed in Pennsylvania.
Specialties and state licenses
- Radiation oncology, PennsylvaniaPrimary
Radiation oncologists near Dr. Chang
Counts of radiation oncologists 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. Won S. Chang billed Medicare for 2,485 services in 2024
CMS data shows 2,485 Medicare services from Dr. Chang across 23 procedure codes in 2024, for 104 Medicare patients. Medicare paid $491,409 for them. Every service was in an office.
Dr. Chang's Medicare services by type, 2024
- Imaging1,289
- Other services1,040
- Office and hospital visits156
Dr. Chang compared with the Pennsylvania median for radiation oncologists, 2024
- Dr. Chang
- Pennsylvania median
- Medicare services
- 2,485vs 1,0272.4 times
- Medicare patients
- 104vs 16035% below
- Part D claims
- 16vs 3959% below
Medians across 308 radiation oncologists in Pennsylvania 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other radiation oncologists in Pennsylvania.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Won S. Chang treated 104 Medicare patients in 2024, average age 75
CMS counts 104 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 44 patients. 75% of them have cancer, and 75% have high blood pressure. 14% are also on Medicaid. Their average risk score is 2.16, 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 71, with 49% women.
Dr. Chang's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Chang's Medicare patients by sex, 2024
- Women6058%
- Men4442%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- Cancer75%
- High blood pressure75%
- High cholesterol75%
- Arthritis47%
- Ischemic heart disease36%
- Diabetes34%
- Chronic kidney disease32%
- COPD31%
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 71
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Won S. Chang wrote 78 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 78 Medicare Part D claims for 37 patients. 85% of them were for generic drugs. CMS names the drug for 16 of them, across 1 drug with 11 or more claims each, at $174 in total drug cost.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic66 claims85%
- Brand-name12 claims15%
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
- Opioids15%12 of 78 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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. Won S. 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. Won S. Chang received $1,242 in industry payments from 2024 to 2025
CMS Open Payments shows 19 general payments to Dr. Chang from 15 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 58% of the total. AstraZeneca Pharmaceuticals LP paid the most, $540.
General payments to Dr. Chang by program year, 2024 to 2025
General payments to Dr. Chang by kind, 2024 to 2025
- Food and beverage$71758%
- Consulting fees$52542%
Companies that paid Dr. Chang the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Won S. Chang graduated from Temple University School of Medicine
Dr. Chang graduated from Temple University School of Medicine in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Won S. 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) |
| 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. Won S. 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. Won S. Chang's NPI number?
Dr. Won S. Chang's NPI number is 1992787618. It was assigned on November 17, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Won S. Chang?
Dr. Won S. Chang is a radiation oncologist in Norristown, Pennsylvania. The primary specialty in the NPI Registry is Radiation Oncology Physician (taxonomy code 2085R0001X).
Where does Dr. Won S. Chang practice?
Dr. Chang practices at 559 West Germantown Pike, East Norriton, PA 19403. Dr. Chang's primary practice is Jefferson Einstein Montgomery Hospital in East Norriton, Pennsylvania, part of Thomas Jefferson University. Dmand AI also links Dr. Chang to 1 hospital, 1 group practice or clinic and 1 medical group.
What is Dr. Won S. Chang's office phone number?
The practice phone on file for Dr. Chang is (484) 662-1000.
What is Dr. Won S. Chang's medical license number?
Dr. Chang holds Pennsylvania license MD071181L.
Which hospitals is Dr. Won S. Chang affiliated with?
Dr. Chang practices at Jefferson Einstein Montgomery Hospital in East Norriton, Pennsylvania. Dr. Chang is also affiliated with Jefferson Einstein Philadelphia Hospital. Dmand AI links Dr. Chang to 1 more hospital.
What medical group is Dr. Won S. Chang part of?
Dr. Chang is linked to Einstein Gastroenterology Associates. Dmand AI links Dr. Chang to 1 more medical group.
Does Dr. Won S. Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 2,485 services in 2024, and Dr. Chang accepts Medicare assignment.
How many Medicare patients does Dr. Won S. Chang see?
CMS counts 104 Medicare patients who saw Dr. Chang in 2024, with an average age of 75.
What services does Dr. Won S. Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were medicare service (G6012), medicare service (G6015) and medicare service (G6002).
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Where did Dr. Won S. Chang go to medical school?
Dr. Chang graduated from Temple University School of Medicine in 1995.
What drugs does Dr. Won S. Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Dexamethasone.
Has Dr. Won S. Chang received payments from drug or device companies?
CMS Open Payments shows $1,242 in general payments to Dr. Chang from 15 companies from 2024 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Won S. Chang been practicing?
Dr. Chang graduated from medical school in 1995, 31 years ago.
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