James J. Diffee, MD
Internal Medicine Physician · Jackson, TN
James J. Diffee, MD is an internal medicine physician with a practice address in Jackson, Tennessee, and NPI 1518952514, issued on Sep 15, 2005. Check the license (Tennessee 11702, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- James J. Diffee
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 11702 TN
Self-reported in NPPES; status is on the state search - Practice location
- 2863 Highway 45 Byp, Jackson, TN 38305
- Phone
- (731) 664-1375
- Enumerated
- Sep 15, 2005
- Record last updated
- Nov 29, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (731) 664-1378
- Medicaid ID
- 3010985 TN
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,596 in Tennessee → Look up another NPI →
Also registered at 2863 Highway 45 Byp
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify James J. Diffee in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 11702Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.1 times the Medicare Part D claims of the average internal medicine physician in 2024
9,808 Medicare Part D claims for 503 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. 186 claims were for opioids.
Most prescribed
- Amlodipine Besylate591 claims
- Atorvastatin Calcium441 claims
- Metformin Hcl343 claims
- Omeprazole319 claims
- Lisinopril278 claims
- Levothyroxine Sodium277 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.
The MIPS final score for 2023 (Medicare payment program): 92.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
James J. Diffee among 2,596 internal medicine physician records in Tennessee
James J. Diffee, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2012 · 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).
64 internal medicine physician records list a practice address in Jackson
They are 64 of the 2,531 NPPES records with a practice address in Jackson, and 2,596 internal medicine physician records in Tennessee.
All 2,596 in Tennessee → Every provider in Jackson → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Charles Alston, MDJackson, TN 383051699734426
- Mary Anderson, MDJackson, TN 383051386639136
- Marshall Banks, M.D.Jackson, TN 383051104811249
- Jere Hammond, MDJackson, TN 383051891763819
- Edwin Hays, MDJackson, TN 383051831167758
- Daniel Honeycutt, MDJackson, TN 383051316915242
- John Jenkins, MDJackson, TN 383051659349538
- Natasha Mahajan, MDJackson, TN 383051174590251
Common questions
What is James J. Diffee, MD's NPI number?
James J. Diffee, MD's National Provider Identifier (NPI) is 1518952514, issued on Sep 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James J. Diffee, MD located?
The NPPES record lists a practice address at 2863 Highway 45 Byp, Jackson, TN, 38305. Phone: (731) 664-1375. Providers update this record themselves, so call before visiting.
How can I verify James J. Diffee, MD's license?
NPPES lists Tennessee license number 11702, 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 James J. Diffee, MD prescribe under Medicare Part D?
In 2024, James J. Diffee, MD had 9,808 Medicare Part D claims for 503 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is James J. Diffee, MD's MIPS final score?
The 2023 MIPS final score is 92.7 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.