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DR. THOMAS JOHN GNIADEK MD PHD
NPI 1205101334
Pathology - Anatomic Pathology & Clinical Pathology in Saint Louis, MO

Active since March 22, 2012PECOS EnrolledAccepts Medicare Assignment
1402 S GRAND BLVD, SAINT LOUIS, MO 63104(314) 617-2000 Get Directions Write a Review

NPPES record last updated: January 7, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Jan 7, 2026, Jun 3, 2025, Oct 25, 2018 and 2 more (5 updates tracked since 2017).

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

NPI1205101334
Entity TypeIndividualMale
Primary Taxonomy207ZP0102X
Provider Legal NameDR. THOMAS JOHN GNIADEKCredential: MD PHD
Location Address1402 S GRAND BLVDSaint Louis, MO 63104-1004
Mailing Address844 Knollwood RdDeerfield, IL 60015-3313 · (203) 806-0125
Phone(314) 617-2000
Sole ProprietorNo
Medical School CMSOtherGraduated 2012
Enumeration DateMarch 22, 2012
Last NPPES UpdateJanuary 7, 20265 updates tracked since enumeration
NPPES CertifiedJanuary 7, 2026
✔ NPI 1205101334 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
Licenses✔ Licensed in MO · 2024018547✔ Licensed in IL · 036145372
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
Also ListedPathology · Blood Banking & Transfusion MedicineTaxonomy 207ZB0001X · License 036145372 (IL), 2024018547 (MO)
1402 S GRAND BLVD, Saint Louis, MO 63104
Open in Google Maps ↗

Secondary Practice Locations 3

Location 1844 Knollwood RdDeerfield, IL 60015-3313 · Phone (203) 806-0125
Location 2300 S 6th St # Mc604Minneapolis, MN 55487-0999 · Phone (612) 596-1036
Location 32525 Chicago AveMinneapolis, MN 55404-4518 · Phone (612) 813-6000

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

PECOS PAC ID8022269729
PECOS Enrollment IDI20170522001227
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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, MN
2/5 CMS rating
OwnershipGovernment - Local
CMS Certification Number240004
Location701 Park AvenueMinneapolis, MN 55415 · Hennepin County
Emergency services Birthing friendly

Physician 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.

New Patient
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

HALA YAMOUT M.D.
Student in an Organized Health Care Education/Training Program
1402 S GRAND BLVD, M260
SAINT LOUIS, MO 63104
St. Louis City (314) 977-9853
VICTORIA M WITTGEN
Student in an Organized Health Care Education/Training Program
1402 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 977-9870
ADAM BALES D.O.
Anesthesiology
1402 S GRAND BLVD, M260
SAINT LOUIS, MO 63104
St. Louis City (314) 977-9853
ALLISON NICOLE PODSEDNIK GARDNER MD
Student in an Organized Health Care Education/Training Program
1402 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 617-3811
DR. KATHERINE JASKOWIAK ROBBINS MD
Pathology (Anatomic Pathology & Clinical Pathology)
1402 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 977-4547
DR. VIVIAN MAI HATHUC D.O.
Pathology (Anatomic Pathology & Clinical Pathology)
1402 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 977-4547
TERRY J BUJNAK JR. DO
Orthopaedic Surgery
1402 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 617-3375
MS. FRANCESCA VACCA
Student in an Organized Health Care Education/Training Program
1402 S GRAND BLVD
SAINT LOUIS, MO 63104
St. Louis City (314) 577-8694

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.

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 with the weekly NPPES data releases published by CMS.