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Rheumatology

Marcin T. Gornisiewicz, MD

Works at hospitals in Oak Ridge, TN · Morristown, TN · Harriman, TN · Tennessee

Summary

Dr. Marcin T. Gornisiewicz, MD is a rheumatologist at 4707 Papermill Dr, Knoxville, TN 37909. Phone: (865) 602-7983. Accepts Medicare assignment. In 2024, Marcin T. Gornisiewicz had 321 Original Medicare patients and 71,638 services. NPI 1285729145. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

From official Medicare data

This page shows what Medicare's official clinician data says about Marcin T. Gornisiewicz, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Marcin T. Gornisiewicz accept Medicare assignment?
Yes. Medicare's clinician data says Marcin T. Gornisiewicz 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 Marcin T. Gornisiewicz see?
In 2024, CMS data shows 321 Original Medicare patients and 71,638 services for Marcin T. Gornisiewicz. This counts Original Medicare only and measures volume, not quality.
What is Marcin T. Gornisiewicz's NPI number?
1285729145. 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 Marcin T. Gornisiewicz, 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 patients321
Services billed to Medicare71,638
Different services or procedures40
Participating Medicare providerYes
Average age of these patients73

Most frequent services

  1. Injection, golimumab, 1 mg, for intravenous use (J1602)36,294 services
  2. Injection, abatacept, 10 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered) (J0129)13,850 services
  3. Injection, infliximab, excludes biosimilar, 10 mg (J1745)2,700 services
  4. Injection, denosumab, 1 mg (J0897)2,460 services
  5. Injection, methylprednisolone acetate, 1 mg (J1010)1,200 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%
  • Arthritis75%
  • High cholesterol69%
  • Osteoporosis30%
  • Ischemic heart disease28%
  • Depression27%

Hospitals where Marcin T. Gornisiewicz works

Medicare's Facility Affiliation Data lists Marcin T. Gornisiewicz 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.

Practice locations

Addresses where Marcin T. Gornisiewicz is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Marcin T. Gornisiewicz as a member of this group (CMS data updated October 2, 2026).

  • Rheumatology Consultants, PLLC7 clinicians in the group

Specialties

Find other Rheumatology doctors in Tennessee →

Other rheumatologists in Knoxville

Clinicians with the same Medicare primary specialty in Knoxville, TN — not a recommendation.

All rheumatologists in Knoxville →

Other clinicians in Rheumatology Consultants, PLLC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Graduation year1989 (37 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1285729145
CorrectionsReport 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

  1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  6. Medicare Care Compare — official Medicare tool to look up clinicians