NPI registry status
Active
2026 NPPES data Rheumatology Physician NPI 1588658074 M.D.
Verify on CMS → Sophia Chang, M.D.
Rheumatology Physician in Pasco, Washington.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,200 in Rheumatology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
994
Medicare Part D claims · 98 beneficiaries · Rheumatology Physician avg: 2K
Industry payments
$36.6
1 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Sophia Chang, M.D. filed 994 Medicare Part D claims in 2023 as a Rheumatology Physician in Pasco, Washington.
- 994
- Part D claims, 2023
- $36.6
- industry payments (Sunshine Act)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Sophia Chang, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
994 Top 25% higher than 75% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Sophia Chang, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Sophia Chang, M.D.?
Quality data not reportedPrimary specialty
Rheumatology Physician
Medicare Part D claims
994 52% vs specialty avg
Specialty distribution in Washington
How Rheumatology Physician compares to other specialties among Washington providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Rheumatology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Sophia Chang, M.D. appears in the CMS NPPES registry as a Rheumatology Physician provider holding M.D. credentials at 516 W MARGARET ST, Pasco, WA, 99301, with a listed phone of (509) 547-6086. NPI 1588658074 was issued on 09/11/2005.
Medicare Part D records for calendar year 2023 show 994 prescription claims written by this provider, covering 98 Medicare beneficiaries and totaling roughly $474K in drug spend.
Rheumatology Physician is a mid-sized specialty nationwide, with 6,200 enrolled providers across 52 states and an average of 2,054 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1588658074 |
|---|---|
| Specialty | Rheumatology Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 09/11/2005 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Sophia Chang, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$37
Largest payer
Genentech USA, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - Washington WMC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~34K Washington medical licensees in 2023 - they are NOT specific to Sophia Chang, M.D.. To verify Sophia Chang, M.D.'s current license status, search the WMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
88
Total board actions, Washington 2023
Across 85 cases
2.59
Actions per 1,000 licensees
Washington statewide rate
probation
Most common action type
31 cases
WMC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Washington disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
994
Total Claims
$474K
Total Drug Cost
98
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,097
- Total Day Supply
- 62,010
- Generic Drug Cost
- $35K
Patient Demographics
- Average Patient Age
- 74.4 years
- Avg HCC Risk Score
- 1.61
- Gender Split
- 76% female / 24% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Sophia Chang, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Methotrexate
Methotrexate
233 claims
- Hydroxychloroquine…
Hydroxychloroquine Sulfate
175 claims
- Leflunomide
Leflunomide
144 claims
- Sulfasalazine Dr 77
Sulfasalazine Dr
77 claims
- Sulfasalazine 75
Sulfasalazine
75 claims
- Prednisone 62
Prednisone
62 claims
- Gabapentin 45
Gabapentin
45 claims
- Enbrel Sureclick 34
Enbrel Sureclick
34 claims
| Drug | Claims |
|---|---|
| Methotrexate Methotrexate Sodium | 233 |
| Hydroxychloroquine Sulfate | 175 |
| Leflunomide | 144 |
| Sulfasalazine Dr Sulfasalazine | 77 |
| Sulfasalazine | 75 |
| Prednisone | 62 |
| Gabapentin | 45 |
| Enbrel Sureclick Etanercept | 34 |
| Folic Acid | 22 |
| Alendronate Sodium | 20 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Rheumatology Physician Overview
How Sophia Chang, M.D. fits within the Rheumatology Physician landscape nationally.
6,200
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider
Sophia Chang, M.D.'s 994 claims are below the specialty average of 2,054.
Nearby Rheumatology Physician Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as Chang.
Dr. Jowairiyya Ahmad
M.D.
Lacey, WA
Dr. Hebatalla Allam
M.D.
Kennewick, WA
Dr. Brent Appleton
MD
Seattle, WA
Dr. Percy Balderia
MD
Seattle, WA
Dr. John Baldwin
MD
Bellevue, WA
Compare Rheumatology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Washington medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Rheumatology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Sophia Chang, M.D.'s specialty? ▼
Sophia Chang, M.D. specializes in Rheumatology Physician and practices in Pasco, Washington. Credentials: M.D..
How much does Sophia Chang, M.D. prescribe under Medicare Part D? ▼
In 2023, Sophia Chang, M.D. wrote 994 Medicare Part D claims totaling $474K in drug costs for 98 beneficiaries.
Where is Sophia Chang, M.D. located? ▼
Sophia Chang, M.D. is located at 516 W MARGARET ST, Pasco, WA, 99301. Phone: (509) 547-6086.
What is Sophia Chang, M.D.'s NPI number? ▼
Sophia Chang, M.D.'s National Provider Identifier (NPI) is 1588658074, issued on 09/11/2005.
How many Rheumatology Physician providers are there in the US? ▼
There are 6,200 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,054 Medicare Part D claims per year.
What drugs does Sophia Chang, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Sophia Chang, M.D.'s most frequently prescribed drugs include Methotrexate, Hydroxychloroquine Sulfate, Leflunomide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Sophia Chang, M.D. accept Medicare? ▼
Sophia Chang, M.D. appears in CMS Medicare data with 994 Part D claims and 98 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Sophia Chang, M.D.'s credentials? ▼
Sophia Chang, M.D.'s NPI is 1588658074 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.