Grant Michael Clark, M.D.
Radiation Oncology Physician · Knoxville, TN
Grant Michael Clark, M.D. is a radiation oncology physician with a practice address in Knoxville, Tennessee, and NPI 1700029626, issued on Apr 7, 2009. Check the license (Tennessee 51020, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Grant Michael Clark
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 51020 TN
Self-reported in NPPES; status is on the state search - Practice location
- 1915 White Avenue, Knoxville, TN 37916
- Phone
- (865) 331-1155
- Enumerated
- Apr 7, 2009
- Record last updated
- May 18, 2026
- Fax
- (865) 331-3165
- Medicaid ID
- Q005973 TN
- Medicare enrollment
- Enrolled (PECOS I20140624002493); accepts Medicare assignment
- Medical or professional school
- West Virginia University School Of Medicine, 2009
- Entity
- Type 1 · individual
Also registered at 1915 White Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Richard Grapski, MDHematology & Oncology Physician1679543805
- Tabitha Perry, M.S.Genetic Counselor (M.S.)1588190789
Verify Grant Michael Clark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 51020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.2 times the Medicare Part D claims of the average radiation oncology physician in 2024
423 Medicare Part D claims for 174 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 46 claims were for opioids.
Most prescribed
- Tamsulosin Hcl67 claims
- Dexamethasone46 claims
- Hydrocodone-Acetaminophen36 claims
- Pantoprazole Sodium35 claims
- Sucralfate33 claims
- Lorazepam21 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 practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- East Tennessee Radiation Oncology, P.C.Knoxville, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Radiation Oncology Physician providers in Tennessee
There are 132 radiation oncology physician records in Tennessee.
Other radiation oncology physician records in Tennessee
- Sean All, MDNashville, TN1962906974
- John Anderson, MDMorristown, TN1053384362
- David Ange, M.D.Knoxville, TN1992853667
- Marc Apple, MDKnoxville, TN1164422697
- Donald Arwood, MDKnoxville, TN1770550907
- Khush Aujla, MDNashville, TN1134582240
- Diandra Ayala-Peacock, MDNashville, TN1558682336
- Matthew Ballo, M.D.Memphis, TN1013017094
- Milad Baradaran GhahfarokhiNashville, TN1629690573
- Marion Bolin, M.D.Nashville, TN1952330672
Common questions
What is Grant Michael Clark, M.D.'s NPI number?
Grant Michael Clark, M.D.'s National Provider Identifier (NPI) is 1700029626, issued on Apr 7, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Grant Michael Clark, M.D. located?
The NPPES record lists a practice address at 1915 White Avenue, Knoxville, TN, 37916. Phone: (865) 331-1155. Providers update this record themselves, so call before visiting.
How can I verify Grant Michael Clark, M.D.'s license?
NPPES lists Tennessee license number 51020, 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 Grant Michael Clark, M.D. prescribe under Medicare Part D?
In 2024, Grant Michael Clark, M.D. had 423 Medicare Part D claims for 174 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Grant Michael Clark, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. 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.