Ryan Charles Mueller, MD
Radiation Oncology Physician · O Fallon, IL
Ryan Charles Mueller, MD is a radiation oncology physician with a practice address in O Fallon, Illinois, and NPI 1912571654, issued on May 17, 2021. Check the license (Illinois 036179545, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Ryan Charles Mueller
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- 036179545 IL
125077834 IL
2022017916 MO
Self-reported in NPPES; status is on the state search - Practice location
- 321 Regency Park Ste 100, O Fallon, IL 62269
- Phone
- (618) 416-7970
- Enumerated
- May 17, 2021
- Record last updated
- Apr 15, 2026
- Fax
- (618) 416-7971
- Medicare enrollment
- Enrolled (PECOS I20260514002797); may accept Medicare assignment
- Medical or professional school
- Southern Illinois University School Of Medicine, 2021
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 277 in Illinois → Look up another NPI →
Also registered at 321 Regency Park Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rachael Demattei, APRNNurse Practitioner1891443289
- Bachir Farah, M.D.Hematology & Oncology Physician1336370915
- Justin Floyd, DOMedical Oncology Physician1629164678
- Bassam Maalouf, M.D.Hematology & Oncology Physician1720173438
- Julianne Tomac, DNP, FNP-CFamily Nurse Practitioner1245018944
- Mark Walshauser, M.D.Hematology & Oncology Physician1306020664
Verify Ryan Charles Mueller in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036179545Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average radiation oncology physician in 2024
37 Medicare Part D claims for 20 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. 21 claims were for opioids.
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: $511.53
4 payments; by number, the most common kind was food and beverage; the largest payer was Sumitomo Pharma America, Inc. The 3,275 providers of this specialty with any payment received $1,897.85 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.
Ryan Charles Mueller among 277 radiation oncology physician records in Illinois
Ryan Charles Mueller, MD is one of 277 radiation oncology physician records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 91% of them.
- NPI issued2021 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2021 · median 2004 among the 184 with a school on file
- Record last updated2026 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Illinois
There are 277 radiation oncology physician records in Illinois.
All 277 in Illinois → Every provider in O Fallon → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Susan Laduzinsky, MDShiloh, IL 622691942202155
- Jason Lee, MDShiloh, IL 622691851618995
- Camille Williams, M.D.O Fallon, IL 622691649436510
- Jacob Witt, M.D.O Fallon, IL 622691891157871
- Robert Johnson, MDQuincy, IL 623011053308825
- Mark Khil, M.D.Quincy, IL 623011851398598
- Young Yu, M.D.Quincy, IL 623011679570865
- Casey Duncan, MDEffingham, IL 624011487720942
Common questions
What is Ryan Charles Mueller, MD's NPI number?
Ryan Charles Mueller, MD's National Provider Identifier (NPI) is 1912571654, issued on May 17, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Ryan Charles Mueller, MD located?
The NPPES record lists a practice address at 321 Regency Park Ste 100, O Fallon, IL, 62269. Phone: (618) 416-7970. Providers update this record themselves, so call before visiting.
How can I verify Ryan Charles Mueller, MD's license?
NPPES lists Illinois license number 036179545, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ryan Charles Mueller, MD prescribe under Medicare Part D?
In 2024, Ryan Charles Mueller, MD had 37 Medicare Part D claims for 20 beneficiaries; the average among radiation oncology physician prescribers was 134. 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.