Nathan Yennumi Tonlaar, M.D.
Radiation Oncology Physician · Springfield, MO
Nathan Yennumi Tonlaar, M.D. is a radiation oncology physician with a practice address in Springfield, Missouri, and NPI 1811284375, issued on Jul 6, 2011. Check the license (Missouri 2016014780, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Nathan Yennumi Tonlaar
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- 2016014780 MO
4301099423 MI
Self-reported in NPPES; status is on the state search - Practice location
- 2055 S Fremont Ave, Springfield, MO 65804
- Phone
- (417) 820-2468
- Enumerated
- Jul 6, 2011
- Record last updated
- Jun 2, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (417) 820-7794
- Medicare enrollment
- Enrolled (PECOS I20160811000338); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 2011
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 136 in Missouri → Look up another NPI →
Also registered at 2055 S Fremont Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Edward Braud, M.D.Hematology & Oncology Physician1922118280
- Steven Braun, MDRadiation Oncology Physician1801875919
- Sara Bruner, PHARMDOncology Pharmacist1356204143
- Jay Carlson, D.O.Gynecologic Oncology Physician1194835181
- Kimberly Creach, M.D.Radiation Oncology Physician1558568618
- Christopher Estes, M.D.Radiation Oncology Physician1073824553
Verify Nathan Yennumi Tonlaar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2016014780Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average radiation oncology physician in 2024
312 Medicare Part D claims for 142 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. 69 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen65 claims
- Levofloxacin65 claims
- Diazepam44 claims
- Prednisone26 claims
- Tamsulosin Hcl17 claims
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: $414.44
5 payments; by number, the most common kind was food and beverage; the largest payer was Tempus AI, 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.
Bills Medicare through one group practice
- Mercy Clinic Springfield CommunitiesSpringfield, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan Yennumi Tonlaar among 136 radiation oncology physician records in Missouri
Nathan Yennumi Tonlaar, M.D. is one of 136 radiation oncology physician records with a practice address in Missouri. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 71% of them.
- NPI issued2011 · 71% of these records are older, 25% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2011 · median 2004 among the 96 with a school on file
- Record last updated2016 · 46% 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 Missouri 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 Missouri
There are 136 radiation oncology physician records in Missouri.
All 136 in Missouri → Every provider in Springfield → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Steven Braun, MDSpringfield, MO 658041801875919
- John Clouse, M.D.Springfield, MO 658041144224569
- Kimberly Creach, M.D.Springfield, MO 658041558568618
- Christopher Estes, M.D.Springfield, MO 658041073824553
- Hyewon Kim, MDSpringfield, MO 658041376533927
- Ibrahim Abdalla, M.D.Springfield, MO 658071437154630
- Michael Albritton, MDSpringfield, MO 658071548264971
- Nicholas Madden, MDSpringfield, MO 658071083903785
Common questions
What is Nathan Yennumi Tonlaar, M.D.'s NPI number?
Nathan Yennumi Tonlaar, M.D.'s National Provider Identifier (NPI) is 1811284375, issued on Jul 6, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Yennumi Tonlaar, M.D. located?
The NPPES record lists a practice address at 2055 S Fremont Ave, Springfield, MO, 65804. Phone: (417) 820-2468. Providers update this record themselves, so call before visiting.
How can I verify Nathan Yennumi Tonlaar, M.D.'s license?
NPPES lists Missouri license number 2016014780, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathan Yennumi Tonlaar, M.D. prescribe under Medicare Part D?
In 2024, Nathan Yennumi Tonlaar, M.D. had 312 Medicare Part D claims for 142 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.