Mackenzie David Hay, M.D.
Emergency Medicine Physician · Knoxville, TN
Mackenzie David Hay, M.D. is an emergency medicine physician with a practice address in Knoxville, Tennessee, and NPI 1407010358, issued on Jul 10, 2008. Check the license (Tennessee 46388, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Mackenzie David Hay
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 46388 TN
Self-reported in NPPES; status is on the state search - Practice location
- 900 E Oak Hill Ave, Knoxville, TN 37917
- Phone
- (865) 545-7573
- Enumerated
- Jul 10, 2008
- Record last updated
- May 10, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150828000265); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 2006
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,174 in Tennessee → Look up another NPI →
Also registered at 900 E Oak Hill Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Ange, M.D.Radiation Oncology Physician1992853667
- Sara Babb, RDRegistered Dietitian1477068013
- Jason BarnardOccupational Therapist1821488164
- Annette Bongers, FNPFamily Nurse Practitioner1790067791
- Srinivas Boppana, MDRadiation Oncology Physician1609818269
- William Campbell, M.D.Emergency Medicine Physician1649219239
Verify Mackenzie David Hay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 46388Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% fewer Medicare Part D claims than the average emergency medicine physician in 2024
192 Medicare Part D claims for 138 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 28 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen23 claims
- Ondansetron Hcl22 claims
- Nitrofurantoin Mono-Macro18 claims
- Ciprofloxacin Hcl13 claims
- Prednisone13 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): 78.8 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
- Sussex Emergency Associates LLCLewes, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mackenzie David Hay among 1,174 emergency medicine physician records in Tennessee
Mackenzie David Hay, M.D. is one of 1,174 emergency medicine physician records with a practice address in Tennessee. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 53% of them.
- NPI issued2008 · 53% of these records are older, 44% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2006 · median 2012 among the 667 with a school on file
- Record last updated2013 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in Tennessee
There are 1,174 emergency medicine physician records in Tennessee.
All 1,174 in Tennessee → Every provider in Knoxville → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- William Campbell, M.D.Knoxville, TN 379171649219239
- Frederick Ergen, M.D.Knoxville, TN 379171518927466
- Lindsey Harrell, MDKnoxville, TN 379171942494398
- John Irwin, M.D.Knoxville, TN 379171215982459
- Marwin Martinez, M.D.Knoxville, TN 379171396784419
- Reynald Simmons, M.D.Knoxville, TN 379171528007150
- Charles Adams, M.D.Knoxville, TN 379161093810863
- Gerald Blossom, M.D.Knoxville, TN 379161568499820
Common questions
What is Mackenzie David Hay, M.D.'s NPI number?
Mackenzie David Hay, M.D.'s National Provider Identifier (NPI) is 1407010358, issued on Jul 10, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mackenzie David Hay, M.D. located?
The NPPES record lists a practice address at 900 E Oak Hill Ave, Knoxville, TN, 37917. Phone: (865) 545-7573. Providers update this record themselves, so call before visiting.
How can I verify Mackenzie David Hay, M.D.'s license?
NPPES lists Tennessee license number 46388, 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 Mackenzie David Hay, M.D. prescribe under Medicare Part D?
In 2024, Mackenzie David Hay, M.D. had 192 Medicare Part D claims for 138 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Mackenzie David Hay, M.D.'s MIPS final score?
The 2023 MIPS final score is 78.8 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.