Quick answers
- Does Sophia S. Chang accept Medicare assignment?
- Yes. Medicare's clinician data says Sophia S. 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 Sophia S. Chang see?
- In 2024, CMS data shows 99 Original Medicare patients and 56,304 services for Sophia S. Chang. This counts Original Medicare only and measures volume, not quality.
- What is Sophia S. Chang's NPI number?
- 1588658074. 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 Sophia S. 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 | 99 |
|---|---|
| Services billed to Medicare | 56,304 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, golimumab, 1 mg, for intravenous use (J1602)16,100 services
- Injection, denosumab, 1 mg (J0897)1,080 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)463 services
- Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less (96365)125 services
- Infusion, normal saline solution, 250 cc (J7050)122 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).
- Arthritis75%
- High blood pressure72%
- High cholesterol64%
- Chronic kidney disease54%
- Diabetes30%
- Osteoporosis30%
Practice locations
Addresses where Sophia S. Chang is enrolled with Medicare (CMS data updated October 2, 2026).
- 516 W Margaret StPasco, WA 99301 (509) 547‑6086
- 516 W Margaret St, Ste. 6Pasco, WA 99301
Specialties
- Rheumatologyprimary
- Internal Medicinealso
Other rheumatologists in Washington
Clinicians with the same Medicare primary specialty in Washington — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1983 (43 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588658074 |
| 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