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Dr. Ryan Charles Mueller, MD

Radiation Oncology Physician in O Fallon, IL · enumerated 2021.

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

National Provider Identifier

1912571654

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Registry record

Entity type Individual (Type 1)
Name Dr. Ryan Charles Mueller
Credential MD
Sex Male
Practice address 321 Regency Park Ste 100, O Fallon, IL, 62269
Phone (618) 416-7970
Fax (618) 416-7971
Enumeration date May 17, 2021
Last updated in NPPES Apr 15, 2026

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 125077834 (IL) Secondary
2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 2022017916 (MO) Secondary
2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 036179545 (IL) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

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Frequently asked questions

What is the NPI number for Ryan Mueller?
The National Provider Identifier (NPI) for Ryan Mueller is 1912571654, a Type 1 (individual) record in the CMS NPPES registry.
Where does Ryan Mueller practice?
The practice location on file with NPPES is in O Fallon, IL. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-04-15.