Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Charles Gabriel Hallmark

Psychologist in Spring, TX · enumerated 2018.

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

National Provider Identifier

1275025553

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Registry record

Entity type Individual (Type 1)

Name Dr. Charles Gabriel Hallmark

Sex Male

Practice address Spring, TX, 77380

Phone (281) 815-0899

Enumeration date Jun 3, 2018

Last updated in NPPES Jun 3, 2018

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103TC1900X Counseling Psychologist Behavioral Health & Social Service Providers Secondary

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers Secondary

103TM1800X Intellectual & Developmental Disabilities Psychologist Behavioral Health & Social Service Providers Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers Primary

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.

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Frequently asked questions

Is NPI 1275025553 active?

Yes, as of the latest NPPES snapshot, NPI 1275025553 is active (record last updated 2018-06-03).

How do I verify Charles Hallmark's NPI record?

Cross-check NPI 1275025553 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Graciela Reyes-Mcdonald Psychologist · The Woodlands, TX NPI 1619398989 Graciela F Reyes-Mcdonald School Psychologist · The Woodlands, TX NPI 1336542810 Allison Grodzki Clinical Psychologist · The Woodlands, TX NPI 1770969305 Evelyn Perez School Psychologist · Spring, TX NPI 1942867577 Alexandra Mcwilliams Psychologist · The Woodlands, TX NPI 1841945615 Blaine Cordova Counselor · Spring, TX NPI 1124736434 Grace Autism & Neurodiversity Center Psychologist · The Woodlands, TX NPI 1538943451 Jessica Nunez Mental Health Counselor · The Woodlands, TX NPI 1295557882

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-03.