Quick answers
- Does George H. Niesen accept Medicare assignment?
- Yes. Medicare's clinician data says George H. Niesen 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 George H. Niesen see?
- In 2024, CMS data shows 186 Original Medicare patients and 244 services for George H. Niesen. This counts Original Medicare only and measures volume, not quality.
- What is George H. Niesen's NPI number?
- 1689784738. 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 George H. Niesen, 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 | 186 |
|---|---|
| Services billed to Medicare | 244 |
| Different services or procedures | 49 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)34 services
- Insertion of artery tube for blood sampling or infusion through skin (36620)16 services
- Anesthesia for procedure for total knee joint replacement (01402)15 services
- Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)12 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%
- Arthritis70%
- Ischemic heart disease32%
- Chronic kidney disease31%
- Atrial fibrillation31%
Hospitals where George H. Niesen works
Medicare's Facility Affiliation Data lists George H. Niesen 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.
- Barnes-Jewish St Peters HospitalSaint Peters, MO · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 260191
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260020
- St Lukes HospitalChesterfield, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260179
Practice locations
Addresses where George H. Niesen is enrolled with Medicare (CMS data updated October 2, 2026).
- 10 Hospital DrSaint Peters, MO 63376 (636) 916‑9000
- 100 Entrance WaySaint Peters, MO 63376 (314) 949‑0000
- 232 S Woods Mill RdChesterfield, MO 63017 (314) 434‑1500
- 884 Woods Mill Rd, Suite 100Ballwin, MO 63011 (636) 386‑9224
Group practices
Medicare enrollment lists George H. Niesen as a member of these groups (CMS data updated October 2, 2026).
- Western Anesthesiology Associates Inc256 clinicians in the group
- Midwest Anesthesia Providers SC182 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Saint Peters
Clinicians with the same Medicare primary specialty in Saint Peters, MO — not a recommendation.
Other clinicians in Western Anesthesiology Associates Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Ohio State University College Of Medicine |
| 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) | 1689784738 |
| 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