Iris Wanyun Liou, MD
Gastroenterology Physician · Seattle, WA
Iris Wanyun Liou, MD is a gastroenterology physician with a practice address in Seattle, Washington, and NPI 1427163542, issued on Aug 20, 2006. Check the license (Washington MD00042419, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Iris Wanyun Liou
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- MD00042419 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1959 NE Pacific St, Seattle, WA 98195
- Phone
- (206) 598-4377
- Enumerated
- Aug 20, 2006
- Record last updated
- Jun 5, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicaid ID
- 1427163542 WA
- Medicare enrollment
- Enrolled (PECOS I20040607001231); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 2000
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 533 in Washington → Look up another NPI →
Also registered at 1959 NE Pacific St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Iris Wanyun Liou in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00042419Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average gastroenterology physician in 2024
719 Medicare Part D claims for 191 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Tacrolimus243 claims
- Mycophenolate Mofetil73 claims
- Entecavir66 claims
- Ursodiol50 claims
- Vemlidy40 claims
- Prednisone36 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 93.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- The Association OF University PhysiciansSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Iris Wanyun Liou among 533 gastroenterology physician records in Washington
Iris Wanyun Liou, MD is one of 533 gastroenterology physician records with a practice address in Washington. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 48% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2000 · median 2003 among the 373 with a school on file
- Record last updated2013 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Washington
There are 533 gastroenterology physician records in Washington.
All 533 in Washington → Every provider in Seattle → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Renuka Bhattacharya, MDSeattle, WA 981951932197902
- Teresa BrentnallSeattle, WA 981951104916063
- Elizabeth Broussard, M.D.Seattle, WA 981951669419495
- Rotonya Carr, MDSeattle, WA 981951154309540
- Mark Derleth, M.D.Seattle, WA 981951356457063
- Margaret Eugenio, MDSeattle, WA 981951477661916
- William Grady, M.D.Seattle, WA 981951407943822
- John Inadomi, MDSeattle, WA 981951992808497
Common questions
What is Iris Wanyun Liou, MD's NPI number?
Iris Wanyun Liou, MD's National Provider Identifier (NPI) is 1427163542, issued on Aug 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Iris Wanyun Liou, MD located?
The NPPES record lists a practice address at 1959 NE Pacific St, Seattle, WA, 98195. Phone: (206) 598-4377. Providers update this record themselves, so call before visiting.
How can I verify Iris Wanyun Liou, MD's license?
NPPES lists Washington license number MD00042419, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Iris Wanyun Liou, MD prescribe under Medicare Part D?
In 2024, Iris Wanyun Liou, MD had 719 Medicare Part D claims for 191 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Iris Wanyun Liou, MD's MIPS final score?
The 2023 MIPS final score is 93.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.