DR. GRACE NIZIOLEK MD
NPI 1528486339
Surgery in Saint Louis, MO
About Dr. Grace Niziolek Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GRACE NIZIOLEK MD (NPI 1528486339) is an individual surgery provider in Saint Louis, Missouri, licensed in Missouri (2023027659) and active in the NPI registry since March 2014. She is enrolled in Medicare PECOS, is affiliated with Alton Memorial Hospital, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses 3
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
Dr. Grace Niziolek 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 Reassignment
Medicare enrollment records show Grace Niziolek reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Saint Louis, MO 63110
- Reassigned Medicare billing, Missouri enrollment
- Also billed through NPI 1528005642 (Missouri)
- 172 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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Alton Memorial Hospital
Acute Care Hospitals · Alton, ILMemorial Hospital
Acute Care Hospitals · Belleville, ILBarnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOMissouri Baptist Medical Center
Acute Care Hospitals · Town And Country, MOChristian Hospital Northeast
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
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 Grace Niziolek's NPI number?
The NPI number for Grace Niziolek is 1528486339. It was assigned to this individual provider in the NPPES registry on March 31, 2014.
Where is Grace Niziolek located?
Grace Niziolek practices at 1 Barnes Jewish Hospital Plz Div Surg Accs, Saint Louis, MO 63110. The listed phone number is (314) 362-5298.
What is Grace Niziolek's specialty?
The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.
Is Grace Niziolek enrolled in Medicare?
Yes. Grace Niziolek 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 organization bills Medicare for Grace Niziolek's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Grace Niziolek reassigns Medicare benefits to Washington University (Saint Louis, MO). The 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 Grace Niziolek's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Grace Niziolek accept?
Health plans from Cox HealthPlans and UnitedHealthcare list Grace Niziolek 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 Grace Niziolek affiliated with any hospitals?
According to CMS data, Grace Niziolek is affiliated with Alton Memorial Hospital, Memorial Hospital, Barnes Jewish Hospital, Missouri Baptist Medical Center and Christian Hospital Northeast.
When was this NPI record last updated?
The NPPES record for Grace Niziolek was last updated on April 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months 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.
# Dr. Grace Niziolek, MD · NPI 1528486339
Surgery physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since March 31, 2014.
## Identity
- **NPI:** 1528486339 (Entity type: Individual)
- **Enumerated:** March 31, 2014
- **Primary specialty:** Surgery · taxonomy 208600000X
- **State license:** 2023027659 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 BARNES JEWISH HOSPITAL PLZ, DIV SURG ACCS, Saint Louis, MO 63110-1003
- **Phone:** (314) 362-5298 · **Fax:** (888) 824-2176
## 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:** Washington University (NPI 1134169568, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** April 17, 2025
- **Other identifiers:** Medicaid 200126738 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1528486339) · Data from the CMS NPPES public registry.