Michael Ansstas, M.D.
Gastroenterology Physician · Saint Louis, MO
Michael Ansstas, M.D. is a gastroenterology physician with a practice address in Saint Louis, Missouri, and NPI 1851658728, issued on Apr 17, 2012. Check the license (Missouri 2012032351, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Michael Ansstas
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 2012032351 MO
A160085 CA
036153515 IL
Self-reported in NPPES; status is on the state search - Practice location
- 11155 Dunn RD Ste 309E, Saint Louis, MO 63136
- Phone
- (314) 953-8799
- Enumerated
- Apr 17, 2012
- Record last updated
- Oct 27, 2025
- Medicare enrollment
- Enrolled (PECOS I20230628002123); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 414 in Missouri → Look up another NPI →
Also registered at 11155 Dunn RD Ste 309E
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Cassidy Aurelio, FNP-CNurse Practitioner1457180127
- Olivia Edwards, PA-CPhysician Assistant1780207795
- Folayemi Ganiyu, NPNurse Practitioner1174340186
- Olayiwola Olagbegi, M.D.Gastroenterology Physician1912011255
- Jason Taylor, M.D.Gastroenterology Physician1972623536
Verify Michael Ansstas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2012032351Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average gastroenterology physician in 2024
339 Medicare Part D claims for 212 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Pantoprazole Sodium163 claims
- Gavilyte-G55 claims
- Peg-3350 And Electrolytes33 claims
- Sod Sulf-Potass Sulf-Mag Sulf17 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: $239.28
4 payments; by number, the most common kind was food and beverage; the largest payer was Olympus Corporation of the Americas. 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.
Bills Medicare through 2 group practices
- Archbold Medical Group, Inc.Thomasville, GA
- Hshs Medical Group IncO Fallon, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Ansstas among 414 gastroenterology physician records in Missouri
Michael Ansstas, M.D. is one of 414 gastroenterology physician records with a practice address in Missouri. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 72% of them.
- NPI issued2012 · 72% of these records are older, 23% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated2002 · median 2003 among the 303 with a school on file
- Record last updated2025 · 47% 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 Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Missouri
There are 414 gastroenterology physician records in Missouri.
All 414 in Missouri → Every provider in Saint Louis → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Naeem Aslam, MDSaint Louis, MO 631361750347902
- Ashfaq Hakim, MDSaint Louis, MO 631361548353428
- Muhammad Nyazee, MDSaint Louis, MO 631361952494932
- Olayiwola Olagbegi, M.D.Saint Louis, MO 631361912011255
- Jason Taylor, M.D.Saint Louis, MO 631361972623536
- Heather White, MDSaint Louis, MO 631361770576381
- Barry Abramson, M.D.Saint Louis, MO 631311922025980
- Siddique Akram, MDSaint Louis, MO 631311457989071
Common questions
What is Michael Ansstas, M.D.'s NPI number?
Michael Ansstas, M.D.'s National Provider Identifier (NPI) is 1851658728, issued on Apr 17, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Michael Ansstas, M.D. located?
The NPPES record lists a practice address at 11155 Dunn RD Ste 309E, Saint Louis, MO, 63136. Phone: (314) 953-8799. Providers update this record themselves, so call before visiting.
How can I verify Michael Ansstas, M.D.'s license?
NPPES lists Missouri license number 2012032351, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Michael Ansstas, M.D. prescribe under Medicare Part D?
In 2024, Michael Ansstas, M.D. had 339 Medicare Part D claims for 212 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.