John M. Willis, DO
Internal Medicine Physician · Mansfield, TX
John M. Willis, DO is an internal medicine physician with a practice address in Mansfield, Texas, and NPI 1205891207, issued on Apr 20, 2006. Check the license (Texas J0366, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- John M. Willis
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- J0366 TX
Self-reported in NPPES; status is on the state search - Practice location
- 252 Matlock RD Ste 130, Mansfield, TX 76063
- Phone
- (682) 242-8990
- Enumerated
- Apr 20, 2006
- Record last updated
- Mar 23, 2022
- Fax
- (682) 242-8996
- Medicaid ID
- 129827510 TX
- Medicare enrollment
- Enrolled (PECOS I20070807000557); accepts Medicare assignment
- Medical or professional school
- University Of North Texas Hsc, College Of Osteopathic Med, 1990
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 252 Matlock RD Ste 130
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John M. Willis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license J0366Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average internal medicine physician in 2024
8,685 Medicare Part D claims for 535 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 107 claims were for opioids.
Most prescribed
- Atorvastatin Calcium449 claims
- Amlodipine Besylate444 claims
- Losartan Potassium419 claims
- Levothyroxine Sodium274 claims
- Metformin Hcl229 claims
- Lisinopril204 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.
Industry payments in 2024: $386.37
19 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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 one group practice
- MedhealthMansfield, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John M. Willis among 9,175 internal medicine physician records in Texas
John M. Willis, DO is one of 9,175 internal medicine physician records with a practice address in Texas. 82% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1990 · median 2004 among the 6,088 with a school on file
- Record last updated2022 · 49% 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 Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
32 internal medicine physician records list a practice address in Mansfield
They are 32 of the 1,471 NPPES records with a practice address in Mansfield, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Mansfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sado Albitar, M.D.Mansfield, TX 760631073742466
- Denise Bruckerhoff, D.O.Mansfield, TX 760631164690111
- Gretchen Bures, MDMansfield, TX 760631003098815
- Wendy Collini, MDMansfield, TX 760631194937417
- Pramesh Dave, M.D.Mansfield, TX 760631700833001
- Qin Huang, MDMansfield, TX 760631720271489
- Shelley Lenamond, D.O.Mansfield, TX 760631629194311
- Michael McInnis, MDMansfield, TX 760631033189956
Common questions
What is John M. Willis, DO's NPI number?
John M. Willis, DO's National Provider Identifier (NPI) is 1205891207, issued on Apr 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John M. Willis, DO located?
The NPPES record lists a practice address at 252 Matlock RD Ste 130, Mansfield, TX, 76063. Phone: (682) 242-8990. Providers update this record themselves, so call before visiting.
How can I verify John M. Willis, DO's license?
NPPES lists Texas license number J0366, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John M. Willis, DO prescribe under Medicare Part D?
In 2024, John M. Willis, DO had 8,685 Medicare Part D claims for 535 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.