Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Ryan Charles Mueller, MD

Individual provider Internal Medicine Physician · NPI 1912571654

Dr. Ryan Charles Mueller, MD is a Radiation Oncology in O Fallon, Illinois. Graduated from Southern Illinois University School of Medicine in 2021, 5 years ago. Works from 2 locations. Licensed in Illinois and Missouri.

Years since qualifying
5
Trained at
Southern Illinois University School of Medicine
Licensed in
IL, MO
In the registry since
2021
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

321 Regency Park Ste 100
O Fallon, IL 62269-1887
Phone: (618) 416-7970
Fax: (618) 416-7971
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110-1003 — (314) 362-9700

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 036179545 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 125077834 (IL)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence 2022017916 (MO)

Record details

NPI number1912571654
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 17, 2021
Last updated in NPPESApril 15, 2026
Certification dateApril 15, 2026
Mailing addressPo Box 25228, Decatur, IL 62525-5228

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRADIATION ONCOLOGY
Medical schoolSOUTHERN ILLINOIS UNIVERSITY SCHOOL OF MEDICINE
Graduated 2021 (5 years in practice)
Accepts Medicare assignment Not indicated

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