William Gregory Mullinax, M.D.
Hospice and Palliative Medicine (Family Medicine) Physician · Collierville, TN
William Gregory Mullinax, M.D. is a hospice and palliative medicine (family medicine) physician with a practice address in Collierville, Tennessee, and NPI 1972551364, issued on May 5, 2006. Check the license (Tennessee 36834, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- William Gregory Mullinax
- Credential
- M.D.
- Primary taxonomy
- Hospice and Palliative Medicine (Family Medicine) Physician 207QH0002X
- License numbers
- 36834 TN
31104 MS
Self-reported in NPPES; status is on the state search - Practice location
- 1500 W Poplar Ave, Collierville, TN 38017
- Phone
- (901) 226-2800
- Enumerated
- May 5, 2006
- Record last updated
- Feb 9, 2023
- Fax
- (901) 226-2802
- Medicare enrollment
- Enrolled (PECOS I20120201000581); accepts Medicare assignment
- Medical or professional school
- University Of Tennessee, Hsc, College Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest hospice and palliative medicine (family medicine) physician records → All 15 in Tennessee → Look up another NPI →
Also registered at 1500 W Poplar Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Dwana Desanctis, PTPhysical Therapist1558589051
- Nicholas DiloretoInternal Medicine Physician1619530797
- Christopher Duperier, MDAnesthesiology Physician1083753164
Verify William Gregory Mullinax in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license 36834Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average hospice and palliative medicine (family medicine) physician in 2024
205 Medicare Part D claims for 83 beneficiaries, against an average of 1,129 among the 731 providers of this specialty who prescribed in Part D. 34 claims were for opioids.
Most prescribed
- Lorazepam14 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): 76.5 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).
Industry payments in 2024: $141.84
1 payment: food and beverage; the largest payer was Siemens Medical Solutions USA, Inc. The 177 providers of this specialty with any payment received $225.53 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
- Baptist Memorial Medical Group, Inc.Memphis, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Gregory Mullinax among 15 hospice and palliative medicine (family medicine) physician records in Tennessee
William Gregory Mullinax, M.D. is one of 15 hospice and palliative medicine (family medicine) physician records with a practice address in Tennessee. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated1999 · median 1999 among the 10 with a school on file
- Record last updated2023 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QH0002X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospice and Palliative Medicine (Family Medicine) Physician providers in Tennessee
There are 15 hospice and palliative medicine (family medicine) physician records in Tennessee.
All 15 in Tennessee → Every provider in Collierville → Hospice and Palliative Medicine (Family Medicine) Physician nationwide →
The 8 hospice and palliative medicine (family medicine) physician records with the nearest ZIP codes
- William Jackson, MDAtoka, TN 380041407858368
- Christine Lamey, MDMemphis, TN 381191598152522
- Jeffrey Nelson, MDMemphis, TN 381191134539075
- Tricia Mathew, MDMemphis, TN 381201114556826
- Michael Wozny, MDMemphis, TN 381201225478688
- Ashley Wright, D.O.Memphis, TN 381201619400710
- Erin Kipp, DOKnoxville, TN 379091275030884
- Jeanne Jemison, MDMemphis, TN 381341306027495
Common questions
What is William Gregory Mullinax, M.D.'s NPI number?
William Gregory Mullinax, M.D.'s National Provider Identifier (NPI) is 1972551364, issued on May 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Gregory Mullinax, M.D. located?
The NPPES record lists a practice address at 1500 W Poplar Ave, Collierville, TN, 38017. Phone: (901) 226-2800. Providers update this record themselves, so call before visiting.
How can I verify William Gregory Mullinax, M.D.'s license?
NPPES lists Tennessee license number 36834, 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 William Gregory Mullinax, M.D. prescribe under Medicare Part D?
In 2024, William Gregory Mullinax, M.D. had 205 Medicare Part D claims for 83 beneficiaries; the average among hospice and palliative medicine (family medicine) physician prescribers was 1,129. Part D covers Medicare prescriptions only.
What is William Gregory Mullinax, M.D.'s MIPS final score?
The 2023 MIPS final score is 76.5 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.