Walter M. Hassig, M.D.
Gastroenterology Physician · Federal Way, WA
Walter M. Hassig, M.D. is a gastroenterology physician with a practice address in Federal Way, Washington, and NPI 1730152794, issued on Feb 9, 2006. Check the license (Washington MD00037341, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Walter M. Hassig
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- MD00037341 WA
Self-reported in NPPES; status is on the state search - Practice location
- 33915 1St Way S Ste 200, Federal Way, WA 98003
- Phone
- (253) 272-5127
- Enumerated
- Feb 9, 2006
- Record last updated
- Jun 21, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicaid ID
- 8240947 WA
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 533 in Washington → Look up another NPI →
Also registered at 33915 1St Way S Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashley Davis, ARNPNurse Practitioner1861017774
- Charlotte Duvall, PA-SPhysician Assistant1023664844
- Carylin Holsey, DNP, FNP-CFamily Nurse Practitioner1629475926
- Shaily Jain, MDGastroenterology Physician1881630937
- Kevin Leung, MDGastroenterology Physician1588847271
- Po-Hong Liu, MD, MPHInternal Medicine Physician1225531015
Verify Walter M. Hassig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00037341Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% more Medicare Part D claims than the average gastroenterology physician in 2024
864 Medicare Part D claims for 405 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Pantoprazole Sodium222 claims
- Gavilyte-G103 claims
- Peg-3350 And Electrolytes81 claims
- Omeprazole78 claims
- Gavilyte-C71 claims
- Mesalamine31 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.
Industry payments in 2024: $449.41
14 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Walter M. Hassig among 533 gastroenterology physician records in Washington
Walter M. Hassig, M.D. 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 fileNo · 70% of these records are
- Record last updated2019 · 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 Federal Way → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Yumi Ando, M.D.Federal Way, WA 980031295001634
- Robert Bridge, M.D.Federal Way, WA 980031336374909
- Shaily Jain, MDFederal Way, WA 980031881630937
- Kevin Leung, MDFederal Way, WA 980031588847271
- Asad Pervez, MDFederal Way, WA 980031992122063
- Ann Marie Schreiber, D.O.Federal Way, WA 980031376863050
- Romana Shehzadi, MDFederal Way, WA 980031053509257
- Raj Butani, M.D.Bellevue, WA 980041285695221
Common questions
What is Walter M. Hassig, M.D.'s NPI number?
Walter M. Hassig, M.D.'s National Provider Identifier (NPI) is 1730152794, issued on Feb 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Walter M. Hassig, M.D. located?
The NPPES record lists a practice address at 33915 1St Way S Ste 200, Federal Way, WA, 98003. Phone: (253) 272-5127. Providers update this record themselves, so call before visiting.
How can I verify Walter M. Hassig, M.D.'s license?
NPPES lists Washington license number MD00037341, 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 Walter M. Hassig, M.D. prescribe under Medicare Part D?
In 2024, Walter M. Hassig, M.D. had 864 Medicare Part D claims for 405 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
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.