Sophia Chang, M.D.
NPI 1588658074 · Rheumatology Physician · Pasco, WA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sophia Chang, M.D. is a Rheumatology Physician provider in Pasco, WA (NPI 1588658074).
Provider details
- NPI number
- 1588658074
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- MD00036177 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
654 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 463 | $128 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 125 | $63 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 66 | $14 |
Typical Medicare-allowed amounts for these services range $14–$128 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 251 | 63 |
| Leflunomide | 190 | 53 |
| Hydroxychloroquine Sulfate | 186 | 50 |
| Sulfasalazinebrand: Sulfasalazine Dr | 100 | 29 |
| Sulfasalazine | 70 | 18 |
| Gabapentin | 67 | 14 |
| Prednisone | 54 | 22 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$37 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-11
- Last updated
- 2014-09-16
Frequently asked questions
- What is Sophia Chang's NPI number?
- Sophia Chang's National Provider Identifier (NPI) is 1588658074, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sophia Chang's specialty?
- Sophia Chang is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Sophia Chang located?
- Sophia Chang's practice location on file with NPPES is 516 W Margaret St, Pasco, WA 99301-5273.
- What is Sophia Chang's phone number?
- The practice phone number listed in the NPPES registry for Sophia Chang is (509) 547-6086.
- Does Sophia Chang accept Medicare?
- Sophia Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sophia Chang's NPI active?
- Yes — Sophia Chang's NPI (1588658074) is active in the NPPES registry as of the last update on 2014-09-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.