Nathaniel Robert Piel, M.D.
Internal Medicine Physician · Knoxville, TN
Nathaniel Robert Piel, M.D. is an internal medicine physician with a practice address in Knoxville, Tennessee, and NPI 1649565755, issued on Jun 16, 2011. Check the license on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Nathaniel Robert Piel
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 257895 MA
Self-reported in NPPES; status is on the state search - Practice location
- 11440 Parkside Dr Ste 302, Knoxville, TN 37934
- Phone
- (865) 218-9220
- Enumerated
- Jun 16, 2011
- Record last updated
- Feb 19, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (865) 218-3332
- Medicare enrollment
- Enrolled (PECOS I20151015000309); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 2011
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,596 in Tennessee → Look up another NPI →
Also registered at 11440 Parkside Dr Ste 302
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nathaniel Robert Piel in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical ExaminersCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,758 Medicare Part D claims for 506 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 85 claims were for opioids.
Most prescribed
- Atorvastatin Calcium451 claims
- Amlodipine Besylate392 claims
- Levothyroxine Sodium258 claims
- Omeprazole226 claims
- Gabapentin195 claims
- Losartan Potassium194 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): 95.7 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).
Industry payments in 2024: $341.19
17 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Faculty Internal Medicine PLLCKnoxville, TN
- Physiotherapy Associates IncLoudon, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathaniel Robert Piel among 2,596 internal medicine physician records in Tennessee
Nathaniel Robert Piel, M.D. 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 2011, is newer than 70% of them.
- NPI issued2011 · 70% of these records are older, 28% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2011 · median 2003 among the 1,705 with a school on file
- Record last updated2020 · 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).
237 internal medicine physician records list a practice address in Knoxville
They are 237 of the 14,339 NPPES records with a practice address in Knoxville, and 2,596 internal medicine physician records in Tennessee.
All 2,596 in Tennessee → Every provider in Knoxville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Amy Barnett, MDKnoxville, TN 379341285848408
- Michael Collier, MDKnoxville, TN 379341811933674
- Brian Collier, M.D.Knoxville, TN 379341376619726
- James Davis, MDKnoxville, TN 379341184602898
- Kim Emmett, M.D.Knoxville, TN 379341437174356
- Nathan Gray, MDKnoxville, TN 379341952347999
- Isham Hewgley, III, MDKnoxville, TN 379341215915921
- Michael Hill, MDKnoxville, TN 379341881634723
Common questions
What is Nathaniel Robert Piel, M.D.'s NPI number?
Nathaniel Robert Piel, M.D.'s National Provider Identifier (NPI) is 1649565755, issued on Jun 16, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Nathaniel Robert Piel, M.D. located?
The NPPES record lists a practice address at 11440 Parkside Dr Ste 302, Knoxville, TN, 37934. Phone: (865) 218-9220. Providers update this record themselves, so call before visiting.
How can I verify Nathaniel Robert Piel, M.D.'s license?
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 Nathaniel Robert Piel, M.D. prescribe under Medicare Part D?
In 2024, Nathaniel Robert Piel, M.D. had 6,758 Medicare Part D claims for 506 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Nathaniel Robert Piel, M.D.'s MIPS final score?
The 2023 MIPS final score is 95.7 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.