Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

J. Xavier Castillo, MD

Internal Medicine Physician in Houston, TX · enumerated 2006 · practices at Laboratory Corporation of America.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1720013501

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Registry record

Entity type Individual (Type 1)

Name J. Xavier Castillo

Credential MD

Sex Male

Practice address 1111 Augusta Dr, Houston, TX, 77057

Phone (713) 442-2400

Enumeration date Jul 11, 2006

Last updated in NPPES Jun 5, 2021

Taxonomy & licenses

2083P0901X Public Health & General Preventive Medicine Physician Allopathic & Osteopathic Physicians · License K4016 (TX) Secondary

2083X0100X Occupational Medicine Physician Allopathic & Osteopathic Physicians · License K4016 (TX) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License K4016 (TX) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
042829401	Medicaid	TX	-
042829403	Medicaid	TX	-
042829404	Medicaid	TX	-

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 → Validate an NPI →

Frequently asked questions

Where does J. Xavier Castillo practice?

The practice location on file with NPPES is in Houston, TX. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for J. Xavier Castillo?

The National Provider Identifier (NPI) for J. Xavier Castillo is 1720013501, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Meiyu Lai Physical Medicine & Rehabilitation Physician · Houston, TX NPI 1467446021 Kelly Castro Family Medicine Physician · Houston, TX NPI 1699765677 Joyce Martinez Pharmacist · Houston, TX NPI 1154306447 Laboratory Corporation of America Clinical Medical Laboratory · Houston, TX NPI 1841277076 Robert Dillon Urology Physician · Houston, TX NPI 1679541577 Toicha Vincent Internal Medicine Physician · Houston, TX NPI 1871532002 Enrique Cuevo Family Medicine Physician · Houston, TX NPI 1770514721 Tahirih Baker Family Medicine Physician · Houston, TX NPI 1144255233

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-05.