Aaron Robert Steimel, DO
Internal Medicine Physician · O Fallon, MO
Aaron Robert Steimel, DO is an internal medicine physician with a practice address in O Fallon, Missouri, and NPI 1659067874, issued on Apr 12, 2023. Check the license (Missouri 2024049983, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Aaron Robert Steimel
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 2024049983 MO
Self-reported in NPPES; status is on the state search - Practice location
- 20 Progress Point Pkwy Ste 108, O Fallon, MO 63368
- Phone
- (636) 344-2400
- Enumerated
- Apr 12, 2023
- Record last updated
- Jun 4, 2026
- Fax
- (636) 344-2401
- Medicare enrollment
- Enrolled (PECOS I20260318002575); may accept Medicare assignment
- Medical or professional school
- At Still University Of Health Sciences, College Of Osteo Med, Kirksville, 2023
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Also registered at 20 Progress Point Pkwy Ste 108
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christina Arnold, NPNurse Practitioner1952169559
- Jami Beasley, NPAdult Health Nurse Practitioner1710756747
- Kimberly Bonvillain, FNP-CNurse Practitioner1649561788
- Gloria Michelle Edacheril, NPFamily Nurse Practitioner1144502253
- Brian Grus, MDInternal Medicine Physician1053421065
- Laura Hill, ANPAdult Health Nurse Practitioner1194923151
Verify Aaron Robert Steimel 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 2024049983Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average internal medicine physician in 2024
430 Medicare Part D claims for 67 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Losartan Potassium23 claims
- Gabapentin22 claims
- Atorvastatin Calcium21 claims
- Pantoprazole Sodium19 claims
- Trulicity15 claims
- Escitalopram Oxalate13 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.
Aaron Robert Steimel among 2,604 internal medicine physician records in Missouri
Aaron Robert Steimel, DO is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 87% of them.
- NPI issued2023 · 87% of these records are older, 9% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2023 · median 2006 among the 1,443 with a school on file
- Record last updated2026 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 internal medicine physician records list a practice address in O Fallon
They are 17 of the 1,225 NPPES records with a practice address in O Fallon, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in O Fallon → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Daniela Blum Morales, MDO Fallon, MO 633681730561069
- Gregory Genova, M.D.O Fallon, MO 633681750377941
- Naman Ghazal-Albar, MDO Fallon, MO 633681639144785
- Gary Gray, MDO Fallon, MO 633681497729826
- Brian Grus, MDO Fallon, MO 633681053421065
- Geraldine Ryan, M.D.O Fallon, MO 633681689640609
- Rajiv Sadana, MDO Fallon, MO 633681669423034
- Alan Steube, DOO Fallon, MO 633681740857457
Common questions
What is Aaron Robert Steimel, DO's NPI number?
Aaron Robert Steimel, DO's National Provider Identifier (NPI) is 1659067874, issued on Apr 12, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Aaron Robert Steimel, DO located?
The NPPES record lists a practice address at 20 Progress Point Pkwy Ste 108, O Fallon, MO, 63368. Phone: (636) 344-2400. Providers update this record themselves, so call before visiting.
How can I verify Aaron Robert Steimel, DO's license?
NPPES lists Missouri license number 2024049983, 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 Aaron Robert Steimel, DO prescribe under Medicare Part D?
In 2024, Aaron Robert Steimel, DO had 430 Medicare Part D claims for 67 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.