Doctor profile · Federal record
Dr. Nathan Tonlaar, M.D.
Radiation Oncology Physician (CMS: Radiation Oncology) · Radiation Oncology Physician · Springfield, MO
- NPI 1811284375
- Accepts Medicare
- 15 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
2055 S Fremont Ave, Mercy Clinic Radiation Oncology, Chaub O'Reilly Center
Springfield, MO 658042206
(417) 820-2468
fax (417) 820-7794
Credentials & registration
- NPI registered
- July 2011 — 15 yrs on file
- Profile last updated
- June 2, 2016
- Year of graduation
- 2011 — 15 yrs since
- Specialty taxonomy
- 2085R0001X — NUCC code
- State licenses (2)
- Missouri #2016014780 · Michigan #4301099423
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1811284375. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,317
Distinct HCPCS
10
Medicare allowed
$127,808
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
77014 |
Ct guidance for insertion of radiation therapy fields | 518 | 71 | $43 | |
77334 |
Design and construction of complex radiation treatment device | 167 | 72 | $58 | |
77427 |
Radiation treatment management, 5 treatment sessions | 140 | 57 | $182 | |
77300 |
Calculation of radiation therapy dose | 115 | 43 | $32 | |
77263 |
Complex radiation therapy planning | 76 | 71 | $162 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 54 | 54 | $173 | |
77301 |
High precision radiation therapy planning | 34 | 33 | $403 | |
77338 |
Design and construction of radiation treatment device for high precision radiation therapy | 34 | 33 | $216 | |
77290 |
Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved | 30 | 26 | $79 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 22 | 17 | $137 |
In context: peer comparison
Among 4 peers in Springfield Radiation Oncology Physician, average services per provider: 144. This provider delivers 9.1× the peer median.Open Payments
Industry payments received
All-time total
$414
Transactions
5
Manufacturers
5
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Tempus Ai, INC | 1 | $113.89 | |
| Medtronic, INC. | 1 | $104.85 | |
| Novocure INC. | 1 | $93.39 | |
| Siemens Medical Solutions USA, INC. | 1 | $86.79 | |
| Janssen Biotech, INC. | 1 | $15.52 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
180
Patients
159
Total drug cost
$1,521
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 54 | 49 | $478 |
| Levofloxacin | Generic | 38 | 38 | $81 |
| Diazepam | Generic | 32 | 29 | $23 |
| Tamsulosin Hcl | Generic | 26 | 18 | $407 |
| Ondansetron Odt (Ondansetron) | Brand | 16 | 12 | $228 |
| Dexamethasone | Generic | 14 | 13 | $303 |
Frequently asked questions
What is Dr. Nathan Tonlaar's medical specialty?
Dr. Nathan Tonlaar practices Radiation Oncology Physician in Springfield, MO.
Where does Dr. Nathan Tonlaar practice?
Dr. Nathan Tonlaar practices at 2055 S Fremont Ave, Springfield, MO 658042206. Office phone: 4178202468.
What is Dr. Nathan Tonlaar's NPI?
Dr. Nathan Tonlaar's National Provider Identifier (NPI) is 1811284375, issued by NPPES.
Does Dr. Nathan Tonlaar accept Medicare assignment?
Yes. Dr. Nathan Tonlaar accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Nathan Tonlaar commonly perform?
Top Medicare-reported procedures in 2023: Ct guidance for insertion of radiation therapy fields (HCPCS 77014); Design and construction of complex radiation treatment device (HCPCS 77334); Radiation treatment management, 5 treatment sessions (HCPCS 77427). Source: CMS Medicare Physician & Other Practitioners file.