Thomas Guerra Diaz, MD
Family Medicine Physician · Katy, TX
Thomas Guerra Diaz, MD is a family medicine physician with a practice address in Katy, Texas, and NPI 1750398590, issued on Aug 2, 2006. Check the license (Texas G4564, as entered in NPPES) on the Texas Medical Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Thomas Guerra Diaz
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G4564 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1331 W Grand Pkwy N, Katy, TX 77493
- Phone
- (281) 398-8044
- Enumerated
- Aug 2, 2006
- Record last updated
- Sep 6, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (281) 574-3972
- Entity
- Type 1 · individual
Also registered at 1331 W Grand Pkwy N
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nadia Abbasi, M.D.Internal Medicine Physician1184825689
- Jerica Arunthamakun, P.A.Physician Assistant1932451747
- Amir Azer, D.P.MFoot & Ankle Surgery Podiatrist1922448091
- Lisa De Benedet, ACNP-BCAcute Care Nurse Practitioner1750706628
- Gurjyot Doshi, M.D.Hematology & Oncology Physician1063622611
- Ego Ibe, RNCWomen's Health Nurse Practitioner1730233982
Verify Thomas Guerra Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license G4564Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
109 family medicine physician records list a practice address in Katy
They are 109 of the 5,078 NPPES records with a practice address in Katy, and 11,119 family medicine physician records in Texas. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 109 in Katy → All 11,119 in Texas → Every provider in Katy →
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- So Abad, MDWichita Falls, TX1184624694
- Yoseph AbadiRichardson, TX1700742640
- Marcus Abadie, M.D.Athens, TX1104821107
- Montserrat Abadie Sole, M.D.Fort Worth, TX1245437078
- Sarah Abang-Hayes, M.D.San Antonio, TX1326244724
- Ahmad Abazid, M.DRichardson, TX1013238401
- Syed Abbas, M.D.Houston, TX1821267477
Common questions
What is Thomas Guerra Diaz, MD's NPI number?
Thomas Guerra Diaz, MD's National Provider Identifier (NPI) is 1750398590, issued on Aug 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Guerra Diaz, MD located?
The NPPES record lists a practice address at 1331 W Grand Pkwy N, Katy, TX, 77493. Phone: (281) 398-8044. Providers update this record themselves, so call before visiting.
How can I verify Thomas Guerra Diaz, MD's license?
NPPES lists Texas license number G4564, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.