Quick answers
- Does Donald J. Osmack Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says Donald J. Osmack Jr. 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 J. Osmack Jr. see?
- In 2024, CMS data shows 369 Original Medicare patients and 388 services for Donald J. Osmack Jr.. This counts Original Medicare only and measures volume, not quality.
- What is Donald J. Osmack Jr.'s NPI number?
- 1376889410. 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 J. Osmack Jr., 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 | 369 |
|---|---|
| Services billed to Medicare | 388 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)220 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)73 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)43 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)28 services
- New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more (99202)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 cholesterol75%
- High blood pressure70%
- Arthritis53%
- Ischemic heart disease27%
- Depression27%
- Anxiety27%
Hospitals where Donald J. Osmack Jr. works
Medicare's Facility Affiliation Data lists Donald J. Osmack Jr. 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.
- St Lukes HospitalChesterfield, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260179
Practice locations
Addresses where Donald J. Osmack Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 11550 Olive BlvdSaint Louis, MO 63141 (314) 542‑7690
- 17421 Chesterfield Airport RdChesterfield, MO 63005 (636) 685‑7720
- 232 S Woods Mell RdChesterfield, MO 63017
- 233 Clarkson RdEllisville, MO 63011 (636) 256‑8644
- 8857 Ladue Rd ASaint Louis, MO 63124 (314) 576‑8189
Group practices
Medicare enrollment lists Donald J. Osmack Jr. as a member of this group (CMS data updated October 2, 2026).
- Emergency Physicians of St Lukes LLC61 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Other clinicians in Emergency Physicians of St Lukes LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1376889410 |
| 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