Catherine Mannon Deffendall, MD
Internal Medicine Physician · Nashville, TN
Catherine Mannon Deffendall, MD is an internal medicine physician with a practice address in Nashville, Tennessee, and NPI 1922531326, issued on Apr 4, 2017. Check the license (Tennessee 63222, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Catherine Mannon Deffendall
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 63222 TN
Self-reported in NPPES; status is on the state search - Practice location
- 3601 The Vanderbilt Clinic, Nashville, TN 37232
- Phone
- (615) 322-3000
- Enumerated
- Apr 4, 2017
- Record last updated
- May 17, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,596 in Tennessee → Look up another NPI →
Also registered at 3601 The Vanderbilt Clinic
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Catherine Mannon Deffendall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 63222Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average internal medicine physician in 2024
176 Medicare Part D claims for 36 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Prednisone34 claims
- Methotrexate31 claims
- Hydroxychloroquine Sulfate19 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.
Catherine Mannon Deffendall among 2,596 internal medicine physician records in Tennessee
Catherine Mannon Deffendall, 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 2017, is newer than 84% of them.
- NPI issued2017 · 84% of these records are older, 14% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2021 · 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).
613 internal medicine physician records list a practice address in Nashville
They are 613 of the 24,357 NPPES records with a practice address in Nashville, and 2,596 internal medicine physician records in Tennessee.
All 2,596 in Tennessee → Every provider in Nashville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Billy Copeland, M.D.Nashville, TN 372321669473716
- Nancy Davis, MDNashville, TN 372321932153244
- Jennifer DebrulerNashville, TN 372321588656524
- Tiffany Hines, MDNashville, TN 372321164468906
- Melissa Hixson, MDNashville, TN 372321407843089
- Martha Leonard, MDNashville, TN 372321699717819
- Michael Matheny, MD, MS, MPHNashville, TN 372321275579427
- Harvey Murff, M.D.Nashville, TN 372321063445641
Common questions
What is Catherine Mannon Deffendall, MD's NPI number?
Catherine Mannon Deffendall, MD's National Provider Identifier (NPI) is 1922531326, issued on Apr 4, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Mannon Deffendall, MD located?
The NPPES record lists a practice address at 3601 The Vanderbilt Clinic, Nashville, TN, 37232. Phone: (615) 322-3000. Providers update this record themselves, so call before visiting.
How can I verify Catherine Mannon Deffendall, MD's license?
NPPES lists Tennessee license number 63222, 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 Catherine Mannon Deffendall, MD prescribe under Medicare Part D?
In 2024, Catherine Mannon Deffendall, MD had 176 Medicare Part D claims for 36 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.