Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Aaron Robert Steimel, DO

Internal Medicine Physician in O Fallon, MO · enumerated 2023.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1659067874

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Registry record

Entity type Individual (Type 1)

Name Aaron Robert Steimel

Credential DO

Sex Male

Practice address O Fallon, MO, 63368

Phone (636) 344-2400

Fax (636) 344-2401

Enumeration date Apr 12, 2023

Last updated in NPPES Jun 4, 2026

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 2024049983 (MO) Primary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 2024049983 (MO) Secondary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Aaron Steimel's NPI record?

Cross-check NPI 1659067874 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1659067874 active?

Yes, as of the latest NPPES snapshot, NPI 1659067874 is active (record last updated 2026-06-04).

Other providers at this practice address

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Brian Grus Internal Medicine Physician · O Fallon, MO NPI 1053421065 Laura Hill Adult Health Nurse Practitioner · O Fallon, MO NPI 1194923151 Kimberly Bonvillain Nurse Practitioner · O Fallon, MO NPI 1649561788 Gloria Michelle Edacheril Family Nurse Practitioner · O Fallon, MO NPI 1144502253 Krista Jenkins Physician Assistant · O Fallon, MO NPI 1598036071 Sara Tucker Adult Health Nurse Practitioner · O Fallon, MO NPI 1851642235 Caitlin Rogers Family Medicine Physician · O Fallon, MO NPI 1861873077 Daniel Weisel Family Medicine Physician · O Fallon, MO NPI 1629506522

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-04.