John Calvin Horner, M.D.
Internal Medicine Physician · Morristown, TN
John Calvin Horner, M.D. is an internal medicine physician with a practice address in Morristown, Tennessee, and NPI 1760414635, issued on Jul 7, 2006. Check the license (Tennessee 014291, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John Calvin Horner
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 014291 TN
Self-reported in NPPES; status is on the state search - Practice location
- 538 W 6TH North St, Morristown, TN 37814
- Phone
- (423) 587-5283
- Enumerated
- Jul 7, 2006
- Record last updated
- Jan 28, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (425) 587-9508
- Medicaid ID
- 3005475 TN
- Medicare enrollment
- Enrolled (PECOS I20110211000277); accepts Medicare assignment
- Medical or professional school
- University Of Tennessee, Hsc, College Of Medicine, 1982
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,596 in Tennessee → Look up another NPI →
Verify John Calvin Horner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 014291Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
7,043 Medicare Part D claims for 177 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 573 claims were for opioids.
Most prescribed
- Gabapentin349 claims
- Levothyroxine Sodium216 claims
- Pantoprazole Sodium208 claims
- Hydrocodone-Acetaminophen201 claims
- Amlodipine Besylate154 claims
- Montelukast Sodium137 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: $116.00
1 payment: education; the largest payer was Novo Nordisk 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.
John Calvin Horner among 2,596 internal medicine physician records in Tennessee
John Calvin Horner, M.D. 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
- Graduated1982 · median 2003 among the 1,705 with a school on file
- Record last updated2016 · 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).
17 internal medicine physician records list a practice address in Morristown
They are 17 of the 1,132 NPPES records with a practice address in Morristown, and 2,596 internal medicine physician records in Tennessee.
All 2,596 in Tennessee → Every provider in Morristown → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Matthew Allison, M.D.Morristown, TN 378141245680933
- Daniel Castro, MDMorristown, TN 378141821002700
- Allison Debusk Rosson, DOMorristown, TN 378141841920535
- David Goldman, MDMorristown, TN 378141518047059
- Christian Lansing, M.D.Morristown, TN 378141568603512
- Orlanda Lowry, M.D.Morristown, TN 378141174571822
- Suresh Nekuri, MDMorristown, TN 378141619978657
- Michael Tan, MDMorristown, TN 378141669499208
Common questions
What is John Calvin Horner, M.D.'s NPI number?
John Calvin Horner, M.D.'s National Provider Identifier (NPI) is 1760414635, issued on Jul 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Calvin Horner, M.D. located?
The NPPES record lists a practice address at 538 W 6TH North St, Morristown, TN, 37814. Phone: (423) 587-5283. Providers update this record themselves, so call before visiting.
How can I verify John Calvin Horner, M.D.'s license?
NPPES lists Tennessee license number 014291, 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 Calvin Horner, M.D. prescribe under Medicare Part D?
In 2024, John Calvin Horner, M.D. had 7,043 Medicare Part D claims for 177 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.