GEORGE H NIESEN MD
NPI 1689784738
Anesthesiology in Chesterfield, MO
About George H Niesen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GEORGE H NIESEN MD (NPI 1689784738) is an individual anesthesiology provider in Chesterfield, Missouri, licensed in Missouri (R5J87) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Ohio State University College Of Medicine (1986).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
George H Niesen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show George Niesen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- 35 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 309 clinicians in this Medicare group
Saint Louis, MO 63136
- Reassigned Medicare billing, Missouri enrollment
- Medicare enrollment name: Midwest Anesthesia Providers Sc
- 230 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercy Hospital St Louis
Acute Care Hospitals · Saint Louis, MOSt Lukes Hospital
Acute Care Hospitals · Chesterfield, MOBarnes-Jewish St Peters Hospital
Acute Care Hospitals · Saint Peters, MOOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CHESTERFIELD, MO 63017
CHESTERFIELD, MO 63017
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is George Niesen's NPI number?
The NPI number for George Niesen is 1689784738. It was assigned to this individual provider in the NPPES registry on August 30, 2006.
Where is George Niesen located?
George Niesen practices at 232 S Woods Mill Rd, Chesterfield, MO 63017. The listed phone number is (314) 205-6917.
What is George Niesen's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is George Niesen enrolled in Medicare?
Yes. George Niesen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for George Niesen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), George Niesen reassigns Medicare benefits to 3 organizations: Comprehensive Anesthesia Care PC (Chesterfield, MO), Western Anesthesiology Associates, Inc. (Saint Louis, MO) and Midwest Anesthesia Providers S.C (Saint Louis, MO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for George Niesen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does George Niesen accept?
Health plans from Anthem Blue Cross and Blue Shield list George Niesen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is George Niesen affiliated with any hospitals?
According to CMS data, George Niesen is affiliated with Mercy Hospital St Louis, St Lukes Hospital and Barnes-Jewish St Peters Hospital.
When was this NPI record last updated?
The NPPES record for George Niesen was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# George H Niesen, MD · NPI 1689784738
Anesthesiology physician in Chesterfield, Missouri. Individual provider, active in the CMS NPPES registry since August 30, 2006.
## Identity
- **NPI:** 1689784738 (Entity type: Individual)
- **Enumerated:** August 30, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** R5J87 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 232 S WOODS MILL RD, Chesterfield, MO 63017
- **Phone:** (314) 205-6917
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Comprehensive Anesthesia Care PC (NPI 1215975156, Chesterfield, MO); Western Anesthesiology Associates, Inc. (NPI 1275646754, Saint Louis, MO); Midwest Anesthesia Providers S.C (NPI 1295189082, Saint Louis, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Ohio State University College Of Medicine, class of 1986
## Record status
- **NPPES last updated:** July 8, 2007
- **Other identifiers:** Medicare UPIN E57951
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Source: [NPI Profile](https://npiprofile.com/npi/1689784738) · Data from the CMS NPPES public registry.