Samuel Gray Walker, DO
Hospitalist Physician · Knoxville, TN
Samuel Gray Walker, DO is a hospitalist physician with a practice address in Knoxville, Tennessee, and NPI 1144727579, issued on Apr 11, 2018. Check the license (Tennessee 4139, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Samuel Gray Walker
- Credential
- DO
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- 4139 TN
Self-reported in NPPES; status is on the state search - Practice location
- 1924 Alcoa Hwy # U56, Knoxville, TN 37920
- Phone
- (865) 305-9081
- Enumerated
- Apr 11, 2018
- Record last updated
- Jul 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (865) 305-8769
- Medicare enrollment
- Enrolled (PECOS I20210827003015); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 426 in Tennessee → Look up another NPI →
Also registered at 1924 Alcoa Hwy # U56
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Omar Alsharif, MDHematology & Oncology Physician1548758527
- Samar AlsharifHospitalist Physician1528032984
- Kathryn Cook, NPAcute Care Nurse Practitioner1902806524
- Bethany Culver, AGPCNP-BCAcute Care Nurse Practitioner1053758433
- Mary Cummins, DOHospitalist Physician1922492248
Verify Samuel Gray Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 4139Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% fewer Medicare Part D claims than the average hospitalist physician in 2024
391 Medicare Part D claims for 151 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass24 claims
- Clopidogrel21 claims
- Pantoprazole Sodium20 claims
- Prednisone17 claims
- Carvedilol15 claims
- Rosuvastatin Calcium15 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: $258.60
12 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 7,324 providers of this specialty with any payment received $494.84 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 one group practice
- University Health System, Inc.Knoxville, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Samuel Gray Walker among 426 hospitalist physician records in Tennessee
Samuel Gray Walker, DO is one of 426 hospitalist physician records with a practice address in Tennessee. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 78% of them.
- NPI issued2018 · 78% of these records are older, 18% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 84% of these records are
- Graduated2018 · median 2012 among the 356 with a school on file
- Record last updated2021 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Tennessee
There are 426 hospitalist physician records in Tennessee.
All 426 in Tennessee → Every provider in Knoxville → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Issam Almashharawi, M.D.Knoxville, TN 379201598734006
- Samar AlsharifKnoxville, TN 379201528032984
- William Bolin, MDKnoxville, TN 379201912985623
- Richard Bremer, MDKnoxville, TN 379201245218981
- Daniel Brewer, MDKnoxville, TN 379201013975168
- Anthony Cabrera, MDKnoxville, TN 379201316984008
- Felix Chaltry, D.O.Knoxville, TN 379201346212958
- Srilatha Chilukuri, MDKnoxville, TN 379201306939178
Common questions
What is Samuel Gray Walker, DO's NPI number?
Samuel Gray Walker, DO's National Provider Identifier (NPI) is 1144727579, issued on Apr 11, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Samuel Gray Walker, DO located?
The NPPES record lists a practice address at 1924 Alcoa Hwy # U56, Knoxville, TN, 37920. Phone: (865) 305-9081. Providers update this record themselves, so call before visiting.
How can I verify Samuel Gray Walker, DO's license?
NPPES lists Tennessee license number 4139, 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 Samuel Gray Walker, DO prescribe under Medicare Part D?
In 2024, Samuel Gray Walker, DO had 391 Medicare Part D claims for 151 beneficiaries; the average among hospitalist physician prescribers was 521. Part D covers Medicare prescriptions only.
What is Samuel Gray Walker, DO'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.