Dr. Thomas J Sierra, DDS

Dr. Thomas J Sierra is a General Practice Dentistry provider (Dentist) practicing in Pasadena, TX, registered in the NPPES registry with NPI 1770596785 since 2006. The credential DDS stands for Doctor of Dental Surgery.

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NPI	1770596785
Entity type	Individual (Type 1)
Name	Dr. Thomas J Sierra
Credential	DDS
Sex	Male
Practice address	4221 VISTA RD, Pasadena, TX, 77504
Phone	7139432094
Fax	7139432097
Enumeration date	2006-08-14
Last updated in NPPES	2007-07-08

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
1223G0001X	General Practice Dentistry	Primary	21757	TX

DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Copy-ready billing details

Provider: Thomas Sierra, DDS
NPI: 1770596785
Taxonomy: 1223G0001X (General Practice Dentistry)
Address: 4221 VISTA RD, Pasadena, TX, 77504

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1013920016	Linda Sierra	Individual	General Practice Dentistry	Pasadena, TX
1295956241	Linda J Sierra, DDS, P.C.	Organization	General Practice Dentistry	Pasadena, TX
1467835843	Christopher Sierra	Individual	Dentist	Pasadena, TX
1689220840	Christopher Sierra	Organization	General Practice Dentistry	Pasadena, TX

Verify this record

Cross-check NPI 1770596785 against the authoritative CMS record: view Dr. Thomas J Sierra 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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Thomas Sierra?

Thomas Sierra is registered in NPPES with the primary taxonomy of General Practice Dentistry. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.