Quick answers
- Does I-Yuan J. Chang accept Medicare assignment?
- Yes. Medicare's clinician data says I-Yuan J. Chang accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does I-Yuan J. Chang see?
- In 2024, CMS data shows 1,144 Original Medicare patients and 1,707 services for I-Yuan J. Chang. This counts Original Medicare only and measures volume, not quality.
- What is I-Yuan J. Chang's NPI number?
- 1386945921. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for I-Yuan J. Chang, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,144 |
|---|---|
| Services billed to Medicare | 1,707 |
| Different services or procedures | 116 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- X-ray of chest, 1 view (71045)278 services
- X-ray of chest, 2 views (71046)197 services
- Ct scan head or brain without contrast (70450)134 services
- Ct scan of abdomen and pelvis with contrast (74177)80 services
- Dxa bone density measurement of hip, pelvis, spine (77080)77 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis50%
- Ischemic heart disease34%
- Diabetes32%
- Chronic kidney disease31%
Practice locations
Addresses where I-Yuan J. Chang is enrolled with Medicare (CMS data updated October 2, 2026).
- 2222 Welborn StDallas, TX 75219 (214) 559‑5000
Group practices
Medicare enrollment lists I-Yuan J. Chang as a member of this group (CMS data updated October 2, 2026).
- Texas Scottish Rite Hospital for Crippled Children15 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Dallas
Clinicians with the same Medicare primary specialty in Dallas, TX — not a recommendation.
Other clinicians in Texas Scottish Rite Hospital for Crippled Children
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Cincinnati College Of Medicine |
| Graduation year | 2010 (16 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1386945921 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians