Dr. Tony S. Chang, MD
- Medicare services, 2024
- 1,064
- Medicare patients, 2024
- 265
- Part D claims, 2024
- 7,967
- MIPS score, 2024
- 83
- Hospital affiliations
- 2
- Practice address
- 600 Highland Ave, Madison, WI 53792
- Practice phone
- Call (608) 265-1978
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
University Health Services - Madison (Highland Ave)
College / University Student Health · Madison, Wisconsin
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. Tony S. Chang is an internist in Madison, Wisconsin
Dr. Chang practices at University Health Services - Madison (Highland Ave) in Madison, Wisconsin.
Dr. Chang's NPI, 1831166990, was assigned on March 7, 2006. Dr. Chang graduated from University of Wisconsin School of Medicine in 1995. Dr. Chang holds Wisconsin license 42048.
- NPI
- 1831166990NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3476683954
- NPI enumeration date
- March 7, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (608) 265-1978
- 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. Tony S. Chang practices at University Health Services - Madison (Highland Ave) in Madison, Wisconsin
Dr. Chang's primary practice is University Health Services - Madison (Highland Ave), at 600 Highland Ave, Madison, WI 53792. The practice phone is (608) 265-1978.
- University Health Services - Madison (Highland Ave)600 Highland Ave, Madison, WI 53792Phone(608) 265-1978
Source: Dmand AI Affiliation Data
Dr. Tony S. Chang is affiliated with 5 sites of care and 1 medical group
Dr. Chang's primary practice is University Health Services - Madison (Highland Ave) in Madison, Wisconsin. Dr. Chang is also affiliated with University Hospital. The medical group on file is UW Health. Dmand AI also links Dr. Chang to 1 more hospital, 1 group practice or clinic and 1 hospice, each named with a free account. Dr. Chang's employer is on file too: a school & student health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Tony S. Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University Health Services - Madison (Highland Ave) | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Tony S. Chang is one of 1,675 internists in Wisconsin
Internal medicine is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chang is licensed in Wisconsin.
Specialties and state licenses
- Internal medicine, WisconsinPrimary
Internists near Dr. Chang
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
Dr. Tony S. Chang billed Medicare for 1,064 services in 2024
CMS data shows 1,064 Medicare services from Dr. Chang across 12 procedure codes in 2024, for 265 Medicare patients. Medicare paid $40,065 for them. Every service was in an office.
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3452024: 3501%
- Other services
- 2023: 452024: 325622%
- Surgery
- 2023: 2452024: 2421%
- Tests and treatments
- 2023: 362024: 101181%
- Lab and pathology
- 2023: 702024: 4634%
Dr. Chang compared with the Wisconsin median for internists, 2024
- Dr. Chang
- Wisconsin median
- Medicare services
- 1,064vs 4572.3 times
- Medicare patients
- 265vs 19933% above
- Part D claims
- 7,331vs 43316.9 times
Medians across 1,658 internists in Wisconsin 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 internists in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Tony S. Chang treated 265 Medicare patients in 2024, average age 74
CMS counts 265 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 123 patients. 75% of them have high cholesterol, and 69% have high blood pressure. 8% are also on Medicaid. Their average risk score is 0.96, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 64, with 27% women.
Dr. Chang's Medicare patients by age, 2024
Dr. Chang's Medicare patients by sex, 2024
- Women7227%
- Men19373%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High cholesterol75%
- High blood pressure69%
- Diabetes26%
- Arthritis23%
- Ischemic heart disease21%
- Chronic kidney disease20%
- Anxiety19%
- Mood disorders18%
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 64
Patient panel by sex, all payers
- Women27%
- Men73%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Tony S. Chang wrote 7,967 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 7,967 Medicare Part D claims for 470 patients. 85% of them were for generic drugs. CMS names the drug for 7,331 of them, across 133 drugs with 11 or more claims each, at $745,458 in total drug cost. In 2023, CMS named 6,835 claims across 130 drugs.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic6,756 claims85%
- Brand-name1,134 claims14%
- Other77 claims1%
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
- Opioids3%250 of 7,967 claims
- Antibiotics1%102 of 7,967 claims
- Antipsychotics, patients 65 and over1%60 of 7,967 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: 6,8352024: 7,3317%
Drugs named by CMS: 133 in 2024, 130 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. Tony S. Chang scored 83 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 83 out of 100 for Dr. Chang for performance year 2024, reported as part of a group. Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Chang's MIPS scores, performance year 2024
- 83of 100Final score
- 87.8of 100Quality
- 77of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Removal of skin lesions: 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. Tony S. Chang graduated from University of Wisconsin School of Medicine
Dr. Chang graduated from University of Wisconsin School of Medicine in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Tony 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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (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. Tony 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. Tony S. Chang's NPI number?
Dr. Tony S. Chang's NPI number is 1831166990. It was assigned on March 7, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Tony S. Chang?
Dr. Tony S. Chang is an internist in Madison, Wisconsin. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Tony S. Chang practice?
Dr. Chang practices at 600 Highland Ave, Madison, WI 53792. Dr. Chang's primary practice is University Health Services - Madison (Highland Ave) in Madison, Wisconsin. Dmand AI also links Dr. Chang to 1 hospital, 1 group practice or clinic and 1 hospice.
What is Dr. Tony S. Chang's office phone number?
The practice phone on file for Dr. Chang is (608) 265-1978.
What is Dr. Tony S. Chang's medical license number?
Dr. Chang holds Wisconsin license 42048.
Which hospitals is Dr. Tony S. Chang affiliated with?
Dr. Chang is affiliated with University Hospital. Dmand AI links Dr. Chang to 1 more hospital.
What medical group is Dr. Tony S. Chang part of?
Dr. Chang is linked to UW Health.
Does Dr. Tony S. Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 1,064 services in 2024, and Dr. Chang accepts Medicare assignment.
What is Dr. Tony S. Chang's MIPS score?
Dr. Chang's MIPS final score for performance year 2024 is 83 out of 100, reported as part of a group.
How many Medicare patients does Dr. Tony S. Chang see?
CMS counts 265 Medicare patients who saw Dr. Chang in 2024, with an average age of 74.
Show 4 more questionsShow fewer questions
What services does Dr. Tony S. Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were medicare service (G2211), surgery: heart and blood vessels (36415) and office visit, established patient (99214).
Where did Dr. Tony S. Chang go to medical school?
Dr. Chang graduated from University of Wisconsin School of Medicine in 1995.
What drugs does Dr. Tony S. Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
How long has Dr. Tony S. Chang been practicing?
Dr. Chang graduated from medical school in 1995, 31 years ago.
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