Quick answers
- Does Chia-Wen A. Chang accept Medicare assignment?
- Yes. Medicare's clinician data says Chia-Wen A. 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 Chia-Wen A. Chang see?
- In 2024, CMS data shows 809 Original Medicare patients and 2,415 services for Chia-Wen A. Chang. This counts Original Medicare only and measures volume, not quality.
- What is Chia-Wen A. Chang's NPI number?
- 1417210451. 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 Chia-Wen A. 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 | 809 |
|---|---|
| Services billed to Medicare | 2,415 |
| Different services or procedures | 39 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Measurement of corneal curvature and depth of eye (92136)437 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)312 services
- Established patient complete exam of visual system (92014)282 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)267 services
- Removal of cataract with insertion of prosthetic lens (66984)254 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%
- Diabetes42%
- Arthritis37%
- Ischemic heart disease27%
- Chronic kidney disease19%
Practice locations
Addresses where Chia-Wen A. Chang is enrolled with Medicare (CMS data updated October 2, 2026).
- 5021 W Noble Ave, Suite AVisalia, CA 93277 (559) 627‑9393
Group practices
Medicare enrollment lists Chia-Wen A. Chang as a member of this group (CMS data updated October 2, 2026).
- Eye Surgical and Medical Associates, Inc.6 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Visalia
Clinicians with the same Medicare primary specialty in Visalia, CA — not a recommendation.
Other clinicians in Eye Surgical and Medical Associates, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 2012 (14 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417210451 |
| 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