Quick answers
- Which hospitals does Nathan Tonlaar work at?
- Medicare's official clinician data lists Nathan Tonlaar at 1 hospital: Mercy Hospital Springfield. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nathan Tonlaar see patients?
- Medicare's clinician data lists 2 practice locations, including Springfield, MO and Branson, MO. Call before your visit to confirm the address.
- What is Nathan Tonlaar's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does Nathan Tonlaar accept Medicare assignment?
- Yes. Medicare's clinician data says Nathan Tonlaar accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Nathan Tonlaar?
- (417) 820-2468, as listed in official Medicare / NPI Registry data.
- What is Nathan Tonlaar's NPI number?
- 1811284375. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nathan Tonlaar works
Medicare's Facility Affiliation Data lists Nathan Tonlaar at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital SpringfieldSpringfield, MO · Acute Care Hospital · CCN 260065
Practice locations
Addresses where Nathan Tonlaar is enrolled with Medicare (CMS data updated 2026-10-02).
- 2055 S Fremont Ave, Mc Radiation OncologySpringfield, MO 65804 (417) 820‑2468
- 448 State Hwy 248, Suite 160Branson, MO 65616 (417) 213‑4696
Group practices
Medicare enrollment lists Nathan Tonlaar as a member of this group (CMS data updated 2026-10-02).
- Mercy Clinic Springfield Communities1,120 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Springfield
Clinicians with the same Medicare primary specialty in Springfield, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Chicago, Pritzker School Of Medicine |
| Graduation year | 2011 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811284375 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians