NPI registry status
Active
2026 NPPES data Transplant Hepatology Physician NPI 1689998874 M.D.
Verify on CMS → Rex Cheng, M.D.
Transplant Hepatology Physician in Seattle, 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 151 in Transplant Hepatology 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
740
Medicare Part D claims · 270 beneficiaries · Transplant Hepatology Physician avg: 553
Generic prescribing
84%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Rex Cheng, M.D. filed 740 Medicare Part D claims in 2024 as a Transplant Hepatology Physician in Seattle, Washington, prescribing 84% generic.
- 740
- Part D claims, 2024
- 84%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥70th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Rex Cheng, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1689998874), first enumerated 03/17/2010.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 740 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Washington statewide board action statistics are published annually — these figures describe aggregate state activity, not Rex Cheng, M.D.'s individual license status. Verify directly with the state medical board.
Source: WMC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1689998874 · Transplant Hepatology Physician
NPI-10 · ENUM-MID · TAX-TRACE · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1689998874
- ENUM-MID 2010
- TAX-TRACE 151
- RX-LIGHT 740
- BOOK-THIN 5 in Washington
- PHOTO-ENUM Therese Bittermann, MD · 2010
Rex Cheng, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
740 ≥ 70th percentile 70% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Rex Cheng, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Rex Cheng, M.D.?
Quality data not reportedPrimary specialty
Transplant Hepatology Physician
Medicare Part D claims
740 34% vs specialty avg
Specialty distribution in Washington
How Transplant Hepatology 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 Transplant Hepatology 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).
Practice Address
Provider Details
| NPI | 1689998874 |
|---|---|
| Specialty | Transplant Hepatology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/17/2010 |
Hospital and facility affiliations
Facilities where Rex Cheng, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Pacmed Clinics
Seattle, WA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Rex Cheng, M.D.. To verify Rex Cheng, 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.
Brand vs generic prescribing mix · Typical
Rex Cheng, M.D. - brand share 16.0%
Transplant Hepatology Physician average
16% brand-name claims vs 84% generic, on 740 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
740
Total Claims
$286K
Total Drug Cost
270
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,109.233
- Total Day Supply
- 28,315
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $266K
- Generic Drug Cost
- $20K
- Antibiotic Claims
- 22
Patient Demographics
- Average Patient Age
- 70.4 years
- Avg HCC Risk Score
- 1.18
- Gender Split
- 66% female / 34% male
- Age Distribution
- <65: 28, 65-74: 164, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Rex Cheng, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Omeprazole
Omeprazole
145 claims
- Pantoprazole Sodium
Pantoprazole Sodium
73 claims
- Gavilyte-G 52
Gavilyte-G
52 claims
- Peg-3350 And Elect… 48
Peg-3350 And Electrolytes
48 claims
- Dicyclomine Hcl 47
Dicyclomine Hcl
47 claims
- Nortriptyline Hcl 44
Nortriptyline Hcl
44 claims
- Ursodiol 36
Ursodiol
36 claims
- Lansoprazole 26
Lansoprazole
26 claims
| Drug | Claims |
|---|---|
| Omeprazole | 145 |
| Pantoprazole Sodium | 73 |
| Gavilyte-G Peg3350/Sod Sulf,bicarb,cl/Kcl | 52 |
| Peg-3350 And Electrolytes Peg3350/Sod Sulf,bicarb,cl/Kcl | 48 |
| Dicyclomine Hcl | 47 |
| Nortriptyline Hcl | 44 |
| Ursodiol | 36 |
| Lansoprazole | 26 |
| Gavilyte-C Peg3350/Sod Sulf,bicarb,cl/Kcl | 20 |
| Azathioprine | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Transplant Hepatology Physician Overview
How Rex Cheng, M.D. fits within the Transplant Hepatology Physician landscape nationally.
151
Transplant Hepatology Physician Providers in US
36
States with Transplant Hepatology Physician
553
Avg Claims per Provider
Rex Cheng, M.D.'s 740 claims are above the specialty average of 553.
Nationwide Transplant Hepatology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Cheng, both outside Washington so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2010)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Transplant Hepatology Physician Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as Cheng.
One of 5 Transplant Hepatology Physician providers enrolled in Washington, 4 are shown here.
Dr. Yumi Ando
M.D.
Federal Way, WA
Dr. Calvin Kiani
MD
Edmonds, WA
Dr. Ryan Kwok
M.D.
Tacoma, WA
Dr. Cierra Smith
DO
Spokane, WA
Compare Transplant Hepatology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Rex Cheng, M.D.'s specialty? ▼
Rex Cheng, M.D. specializes in Transplant Hepatology Physician and practices in Seattle, Washington. Credentials: M.D..
How much does Rex Cheng, M.D. prescribe under Medicare Part D? ▼
In 2024, Rex Cheng, M.D. wrote 740 Medicare Part D claims totaling $286K in drug costs for 270 beneficiaries.
Where is Rex Cheng, M.D. located? ▼
Rex Cheng, M.D. is located at 1101 MADISON ST STE 301, Seattle, WA, 98104. Phone: (206) 505-1300.
What is Rex Cheng, M.D.'s NPI number? ▼
Rex Cheng, M.D.'s National Provider Identifier (NPI) is 1689998874, issued on 03/17/2010.
Does Rex Cheng, M.D. prescribe more brand-name or generic drugs? ▼
Rex Cheng, M.D.'s prescribing is 16% brand-name and 84% generic drugs by claim count, with $266K in brand drug costs.
How many Transplant Hepatology Physician providers are there in the US? ▼
There are 151 Transplant Hepatology Physician providers across 36 states in the US. The average Transplant Hepatology Physician provider writes 553 Medicare Part D claims per year.
What drugs does Rex Cheng, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Rex Cheng, M.D.'s most frequently prescribed drugs include Omeprazole, Pantoprazole Sodium, Gavilyte-G. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Rex Cheng, M.D. accept Medicare? ▼
Rex Cheng, M.D. appears in CMS Medicare data with 740 Part D claims and 270 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Rex Cheng, M.D.'s credentials? ▼
Rex Cheng, M.D.'s NPI is 1689998874 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 (2024). 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 August 2026 (NPPES) / 2024 (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
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 August 2026.