DR. THOMAS JOHN GNIADEK MD PHD
NPI 1205101334
Pathology - Anatomic Pathology & Clinical Pathology in Saint Louis, MO
About Dr. Thomas John Gniadek Md Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. THOMAS JOHN GNIADEK MD PHD (NPI 1205101334) is an individual anatomic pathology & clinical pathology provider in Saint Louis, Missouri, licensed in Missouri (2024018547) and active in the NPI registry since March 2012. He is enrolled in Medicare PECOS, is affiliated with Hennepin County Medical Center, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 3
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. Thomas John Gniadek Md Phd 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
2Medicare enrollment records show Thomas Gniadek reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63104
- Reassigned Medicare billing, Missouri enrollment
- 1,294 clinicians in this Medicare group
Minneapolis, MN 55404
- Reassigned Medicare billing, Minnesota enrollment
- 1,247 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Hennepin County Medical Center
Acute Care Hospitals · Minneapolis, MNPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63104 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 63104
SAINT LOUIS, MO 63104
SAINT LOUIS, MO 63104
SAINT LOUIS, MO 63104
SAINT LOUIS, MO 63104
SAINT LOUIS, MO 63104
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 Thomas Gniadek's NPI number?
The NPI number for Thomas Gniadek is 1205101334. It was assigned to this individual provider in the NPPES registry on March 22, 2012.
Where is Thomas Gniadek located?
Thomas Gniadek practices at 1402 S Grand Blvd, Saint Louis, MO 63104. The listed phone number is (314) 617-2000.
What is Thomas Gniadek's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.
Is Thomas Gniadek enrolled in Medicare?
Yes. Thomas Gniadek 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 Thomas Gniadek's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Gniadek reassigns Medicare benefits to 2 organizations: Ssm Health Care Group (Saint Louis, MO) and Hennepin Healthcare System, Inc (Minneapolis, MN). 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 Thomas Gniadek's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Thomas Gniadek affiliated with any hospitals?
According to CMS data, Thomas Gniadek is affiliated with Hennepin County Medical Center.
When was this NPI record last updated?
The NPPES record for Thomas Gniadek was last updated on January 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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. Thomas John Gniadek, MD PHD · NPI 1205101334
Anatomic Pathology & Clinical Pathology physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since March 22, 2012.
## Identity
- **NPI:** 1205101334 (Entity type: Individual)
- **Enumerated:** March 22, 2012
- **Primary specialty:** Pathology - Anatomic Pathology & Clinical Pathology · taxonomy 207ZP0102X
- **State license:** 2024018547 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1402 S GRAND BLVD, Saint Louis, MO 63104-1004
- **Phone:** (314) 617-2000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Ssm Health Care Group (NPI 1306589544, Saint Louis, MO); Hennepin Healthcare System, Inc (NPI 1962914333, Minneapolis, MN) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** January 7, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1205101334) · Data from the CMS NPPES public registry.