John C. Showalter, MD
Internal Medicine Physician · Knoxville, TN
John C. Showalter, MD is an internal medicine physician with a practice address in Knoxville, Tennessee, and NPI 1104862002, issued on Jun 21, 2006. Check the license (Tennessee 34349, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John C. Showalter
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 34349 TN
Self-reported in NPPES; status is on the state search - Practice location
- 9303 Parkwest Blvd., Knoxville, TN 37923
- Phone
- (865) 690-6451
- Enumerated
- Jun 21, 2006
- Record last updated
- Jun 3, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (865) 694-2613
- Medicaid ID
- 3851852 TN
- Medicare enrollment
- Enrolled (PECOS I20100223000144); accepts Medicare assignment
- Medical or professional school
- University Of Kansas School Of Med (Kc/Wich/Sal), 1997
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,596 in Tennessee → Look up another NPI →
Verify John C. Showalter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 34349Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.9 times the Medicare Part D claims of the average internal medicine physician in 2024
15,625 Medicare Part D claims for 913 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 594 claims were for opioids.
Most prescribed
- Levothyroxine Sodium770 claims
- Atorvastatin Calcium717 claims
- Rosuvastatin Calcium529 claims
- Omeprazole435 claims
- Alprazolam425 claims
- Hydrocodone-Acetaminophen372 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,406.61
104 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Physiotherapy Associates IncLoudon, TN
- Summit Medical Group, PLLCKnoxville, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John C. Showalter among 2,596 internal medicine physician records in Tennessee
John C. Showalter, MD is one of 2,596 internal medicine physician records with a practice address in Tennessee. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 15% of them.
- NPI issued2006 · 15% of these records are older, 46% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1997 · median 2003 among the 1,705 with a school on file
- Record last updated2010 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
237 internal medicine physician records list a practice address in Knoxville
They are 237 of the 14,339 NPPES records with a practice address in Knoxville, and 2,596 internal medicine physician records in Tennessee.
All 2,596 in Tennessee → Every provider in Knoxville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Udit Chaudhuri, MDKnoxville, TN 379231083640569
- Hollis Cotton, MDKnoxville, TN 379231437194792
- Edward Good, MDKnoxville, TN 379231376589903
- Ketan Hira, DOKnoxville, TN 379231346285608
- Jessica Ivey, MDKnoxville, TN 379231124096136
- James Kirby, MDKnoxville, TN 379231497791438
- Jerome McKenzie, MDKnoxville, TN 379231528003761
- Robert Montgomery, MDKnoxville, TN 379231124064167
Common questions
What is John C. Showalter, MD's NPI number?
John C. Showalter, MD's National Provider Identifier (NPI) is 1104862002, issued on Jun 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John C. Showalter, MD located?
The NPPES record lists a practice address at 9303 Parkwest Blvd., Knoxville, TN, 37923. Phone: (865) 690-6451. Providers update this record themselves, so call before visiting.
How can I verify John C. Showalter, MD's license?
NPPES lists Tennessee license number 34349, as entered by the provider. Search the Tennessee Board of Medical Examiners at https://www.tn.gov/health/licensure/me.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John C. Showalter, MD prescribe under Medicare Part D?
In 2024, John C. Showalter, MD had 15,625 Medicare Part D claims for 913 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.