Mark Irwin
Infectious Disease Physician · Knoxville, TN
Mark Irwin is an infectious disease physician with a practice address in Knoxville, Tennessee, and NPI 1104453588, issued on Mar 25, 2020. Check the license (Tennessee 6170, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Mark Irwin
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- 6170 TN
Self-reported in NPPES; status is on the state search - Practice location
- 501 19TH St Ste 600, Knoxville, TN 37916
- Phone
- (865) 525-4333
- Enumerated
- Mar 25, 2020
- Record last updated
- Jul 21, 2025
- Medicaid ID
- Q102113 TN
- Medicare enrollment
- Enrolled (PECOS I20250627000171); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 194 in Tennessee → Look up another NPI →
Verify Mark Irwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 6170Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average infectious disease physician in 2024
77 Medicare Part D claims for 13 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 57% of claims.
Most prescribed
- Odefsey18 claims
- Atazanavir Sulfate11 claims
- Descovy11 claims
- Ritonavir11 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.
Bills Medicare through one group practice
- Covenant Medical Group IncKnoxville, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Irwin among 194 infectious disease physician records in Tennessee
Mark Irwin is one of 194 infectious disease physician records with a practice address in Tennessee. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 95% of them.
- NPI issued2020 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 75% of these records are
- Graduated2020 · median 2005 among the 145 with a school on file
- Record last updated2025 · 32% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Tennessee
There are 194 infectious disease physician records in Tennessee.
All 194 in Tennessee → Every provider in Knoxville → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- John Adams, M.D.Knoxville, TN 379161578542338
- Ernest Kemp, M.D.Knoxville, TN 379161790764637
- Jamison NorwoodKnoxville, TN 379161902293038
- Catherine Sarbah, M.D.Knoxville, TN 379161821002429
- Henry Shiflett, D.O.Knoxville, TN 379161528421658
- Megan Edwards, M.D.Knoxville, TN 379171730446535
- John Narro, MDKnoxville, TN 379201295815512
- Mark Rasnake, MDKnoxville, TN 379201962464644
Common questions
What is Mark Irwin's NPI number?
Mark Irwin's National Provider Identifier (NPI) is 1104453588, issued on Mar 25, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Mark Irwin located?
The NPPES record lists a practice address at 501 19TH St Ste 600, Knoxville, TN, 37916. Phone: (865) 525-4333. Providers update this record themselves, so call before visiting.
How can I verify Mark Irwin's license?
NPPES lists Tennessee license number 6170, 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 Mark Irwin prescribe under Medicare Part D?
In 2024, Mark Irwin had 77 Medicare Part D claims for 13 beneficiaries; the average among infectious disease physician prescribers was 689. 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.