Quick answers
- Does Donald L. Clark Iii accept Medicare assignment?
- Yes. Medicare's clinician data says Donald L. Clark Iii 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 Donald L. Clark Iii see?
- In 2024, CMS data shows 276 Original Medicare patients and 744 services for Donald L. Clark Iii. This counts Original Medicare only and measures volume, not quality.
- What is Donald L. Clark Iii's NPI number?
- 1366090573. 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 Donald L. Clark Iii, 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 | 276 |
|---|---|
| Services billed to Medicare | 744 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)289 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)205 services
- Hospital discharge day management, more than 30 minutes (99239)195 services
- Emergency department visit with moderate level of medical decision making (99284)18 services
- Initial hospital care with same-day admission and discharge with high level of medical decision making, per day, if using time, at least 85 minutes (99236)14 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 pressure75%
- High cholesterol75%
- Arthritis67%
- Atrial fibrillation49%
- Ischemic heart disease48%
- Heart failure48%
Hospitals where Donald L. Clark Iii works
Medicare's Facility Affiliation Data lists Donald L. Clark Iii 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.
- Deaconess Illinois CrossroadsMount Vernon, IL · Acute Care Hospital · Emergency services: listed by Medicare · CCN 140294
- Jersey Community HospitalJerseyville, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140059
- Marshall Browning HospitalDu Quoin, IL · Critical Access Hospital · Emergency services: listed by Medicare · CCN 141331
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260020
Practice locations
Addresses where Donald L. Clark Iii is enrolled with Medicare (CMS data updated October 2, 2026).
- 400 Maple Summit RdJerseyville, IL 62052 (618) 498‑6402
Group practices
Medicare enrollment lists Donald L. Clark Iii as a member of this group (CMS data updated October 2, 2026).
- Trinity Medical Staffing LLC36 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Jerseyville
Clinicians with the same Medicare primary specialty in Jerseyville, IL — not a recommendation.
Other clinicians in Trinity Medical Staffing LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366090573 |
| 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