John M Willis, DO
John M Willis is a Internal Medicine Physician provider (Internal Medicine) practicing in Mansfield, TX, registered in the NPPES registry with NPI 1205891207 since 2006. The credential DO stands for Doctor of Osteopathic Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1205891207 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | John M Willis |
| Credential | DO |
| Sex | Male |
| Practice address | 252 MATLOCK RD STE 130, Mansfield, TX, 76063 |
| Phone | 6822428990 |
| Fax | 6822428996 |
| Enumeration date | 2006-04-20 |
| Last updated in NPPES | 2022-03-23 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | Primary | J0366 | TX |
DO — Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 129827510 | Medicaid | TX | — |
| 8X9688 | Other | TX | BLUE CROSS |
Copy-ready billing details
Provider: John Willis, DO NPI: 1205891207 Taxonomy: 207R00000X (Internal Medicine Physician) Address: 252 MATLOCK RD STE 130, Mansfield, TX, 76063
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1750769840 | Khoi Tran | Individual | Family Medicine Physician | Mansfield, TX |
| 1386140168 | Susanna Avanesyan | Individual | Internal Medicine Physician | Mansfield, TX |
| 1538709084 | Monica Phillips | Individual | Family Nurse Practitioner | Mansfield, TX |
Verify this record
Cross-check NPI 1205891207 against the authoritative CMS record: view John M Willis on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2022-03-23.