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

Nathan Yennumi Tonlaar, MD

Individual provider Radiation Oncology Physician · NPI 1811284375

Nathan Yennumi Tonlaar, MD is a Radiation Oncology in Springfield, Missouri. Graduated from University of Chicago, Pritzker School of Medicine in 2011, 15 years ago. Practices with Mercy Clinic Springfield Communities, a 1,126-clinician group and accepts Medicare assignment. Licensed in Michigan and Missouri.

Years since qualifying
15
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
MI, MO
In the registry since
2011
Specialties on file
2
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

2055 S Fremont Ave Mercy Clinic Radiation Oncology Chaub O'Reilly Ctr
Springfield, MO 65804-2206
Phone: (417) 820-2468
Fax: (417) 820-7794
Show map & directions

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

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 2016014780 (MO)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence 4301099423 (MI)

Record details

NPI number1811284375
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 6, 2011
Last updated in NPPESJune 2, 2016

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 2011 (15 years in practice)
Group practice Mercy Clinic Springfield Communities — 1126 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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