William Stassen, M.D.
Gastroenterology Physician · Austin, TX
William Stassen, M.D. is a gastroenterology physician with a practice address in Austin, Texas, and NPI 1548245079, issued on Dec 7, 2005. Check the license (Texas G7893, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Stassen
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G7893 TX
Self-reported in NPPES; status is on the state search - Practice location
- 8015 Shoal Creek Blvd Ste 118, Austin, TX 78757
- Phone
- (512) 244-2273
- Enumerated
- Dec 7, 2005
- Record last updated
- Jan 8, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (512) 671-7883
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 1,478 in Texas → Look up another NPI →
Verify William Stassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license G7893Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2% more Medicare Part D claims than the average gastroenterology physician in 2024
825 Medicare Part D claims for 304 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Omeprazole360 claims
- Pantoprazole Sodium40 claims
- Dicyclomine Hcl36 claims
- Peg 3350-Electrolyte36 claims
- Esomeprazole Magnesium31 claims
- Plenvu30 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 practice group's MIPS final score for 2023 (Medicare payment program): 79.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,152.73
60 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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.
William Stassen among 1,478 gastroenterology physician records in Texas
William Stassen, M.D. is one of 1,478 gastroenterology physician records with a practice address in Texas. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileNo · 79% of these records are
- Record last updated2013 · 53% 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 Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Texas
There are 1,478 gastroenterology physician records in Texas.
All 1,478 in Texas → Every provider in Austin → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Angel Alcocer, M.D.Austin, TX 787571932184512
- Sanaa Arastu, MDAustin, TX 787571629498068
- Anupama Duddempudi, MDAustin, TX 787571750591616
- Robert Frachtman, M.D.Austin, TX 787571922083039
- Craig Lubin, M.D.Austin, TX 787571033194634
- Sanjana Luther, M.D.Austin, TX 787571023467198
- Binh Pham, M.D.Austin, TX 787571558371559
- Richard Sperling, M.D.Austin, TX 787571881679959
Common questions
What is William Stassen, M.D.'s NPI number?
William Stassen, M.D.'s National Provider Identifier (NPI) is 1548245079, issued on Dec 7, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William Stassen, M.D. located?
The NPPES record lists a practice address at 8015 Shoal Creek Blvd Ste 118, Austin, TX, 78757. Phone: (512) 244-2273. Providers update this record themselves, so call before visiting.
How can I verify William Stassen, M.D.'s license?
NPPES lists Texas license number G7893, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Stassen, M.D. prescribe under Medicare Part D?
In 2024, William Stassen, M.D. had 825 Medicare Part D claims for 304 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is William Stassen, M.D.'s MIPS final score?
The 2023 MIPS final score is 79.4 of 100, reported for the practice group. 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.