Quick answers
- Does Clarence T. Joustra accept Medicare assignment?
- Yes. Medicare's clinician data says Clarence T. Joustra accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Clarence T. Joustra see?
- In 2024, CMS data shows 318 Original Medicare patients and 6,358 services for Clarence T. Joustra. This counts Original Medicare only and measures volume, not quality.
- What is Clarence T. Joustra's NPI number?
- 1942202080. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Clarence T. Joustra, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 318 |
|---|---|
| Services billed to Medicare | 6,358 |
| Different services or procedures | 64 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Injection, methylprednisolone acetate, 1 mg (J1010)3,669 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)800 services
- Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes (99309)446 services
- Insertion of needle into vein for collection of blood sample (36415)290 services
- Hemoglobin a1c level (83036)187 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure61%
- Diabetes42%
- Arthritis36%
- High cholesterol28%
- Ischemic heart disease20%
- Depression19%
Hospitals where Clarence T. Joustra works
Medicare's Facility Affiliation Data lists Clarence T. Joustra at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Cox Barton County HospitalLamar, MO · Critical Access Hospital · Emergency services: listed by Medicare · CCN 261325
- Freeman Health System - Freeman WestJoplin, MO · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 260137
- Mercy Hospital CarthageCarthage, MO · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 261338
- Nevada Regional Medical CenterNevada, MO · Acute Care Hospital · Emergency services: listed by Medicare · CCN 260061
Practice locations
Addresses where Clarence T. Joustra is enrolled with Medicare (CMS data updated October 2, 2026).
- 805 Gulf StLamar, MO 64759 (417) 682‑5508
Specialties
- Family Practiceprimary
Other family doctors in Lamar
Clinicians with the same Medicare primary specialty in Lamar, MO — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | At Still University Of Health Sciences, College Of Osteo Med, Kirksville |
| Graduation year | 1986 (40 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1942202080 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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