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Internal Medicine

James T. Kirby Jr., MD

Works at hospitals in Maryville, TN · Lenoir City, TN · Knoxville, TN … · Tennessee

Summary

Dr. James T. Kirby Jr., MD is an internal medicine doctor at 1225 E Weisgarber Rd, Suite 200, Knoxville, TN 37849. Phone: (865) 938-3627. Accepts Medicare assignment. In 2024, James T. Kirby Jr. had 496 Original Medicare patients and 7,721 services. NPI 1497791438. 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 James T. Kirby Jr., 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 James T. Kirby Jr. accept Medicare assignment?
Yes. Medicare's clinician data says James T. Kirby Jr. 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 James T. Kirby Jr. see?
In 2024, CMS data shows 496 Original Medicare patients and 7,721 services for James T. Kirby Jr.. This counts Original Medicare only and measures volume, not quality.
What is James T. Kirby Jr.'s NPI number?
1497791438. 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 James T. Kirby Jr., 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 patients496
Services billed to Medicare7,721
Different services or procedures124
Participating Medicare providerYes
Average age of these patients76

Most frequent services

  1. Insertion of needle into vein for collection of blood sample (36415)843 services
  2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)631 services
  3. Blood test, comprehensive group of blood chemicals (80053)622 services
  4. Blood test, thyroid stimulating hormone (tsh) (84443)464 services
  5. Manual urinalysis test with examination using microscope, automated (81001)440 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 cholesterol72%
  • High blood pressure70%
  • Arthritis41%
  • Diabetes22%
  • Ischemic heart disease22%
  • Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)20%

Hospitals where James T. Kirby Jr. works

Medicare's Facility Affiliation Data lists James T. Kirby Jr. 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 James T. Kirby Jr. is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 7; the Medicare profile lists all.

Group practices

Medicare enrollment lists James T. Kirby Jr. as a member of these groups (CMS data updated October 2, 2026).

  • Summit Medical Group, PLLC652 clinicians in the group
  • Volunteer Healthcare Services, Inc.91 clinicians in the group

Specialties

Find other Internal Medicine doctors in Tennessee →

Other internal medicine doctors in Knoxville

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

All internal medicine doctors in Knoxville →

Other clinicians in Summit Medical Group, PLLC

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

Clinician information

CredentialMD
Medical schoolUniversity Of Tennessee, Hsc, College Of Medicine
Graduation year1998 (28 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1497791438
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