Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARI VARGA OVERLOCK PH. D.
NPI 1861049520
Counselor - Mental Health in Texarkana, TX

Q: What is Mari Overlock's NPI number?

The NPI number for Mari Overlock is 1861049520. It was assigned to this individual provider in the NPPES registry on August 19, 2019.

Q: What is Mari Overlock's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

Q: When was this NPI record last updated?

The NPPES record for Mari Overlock was last updated on September 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 50 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since August 19, 2019PECOS Enrolled

4100 SUMMERHILL RD, TEXARKANA, TX 75503(903) 794-0011(903) 838-8879 Get Directions Write a Review

NPPES record last updated: September 9, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 9, 2026, Aug 19, 2019 (2 updates tracked since 2019).

On this page

About Dr. Mari Varga Overlock Ph. D. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARI VARGA OVERLOCK PH. D. (NPI 1861049520) is an individual mental health provider in Texarkana, Texas, licensed in Texas (38298) and active in the NPI registry since August 2019. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1861049520

Entity TypeIndividualFemale

Primary Taxonomy101YM0800X

Provider Legal NameDR. MARI VARGA OVERLOCKCredential: PH. D.

Location Address4100 SUMMERHILL RDTexarkana, TX 75503-2732

Mailing Address4100 Summerhill RdTexarkana, TX 75503-2732 · (903) 794-0011

Phone(903) 794-0011

Fax(903) 838-8879

Sole ProprietorYes

Enumeration DateAugust 19, 2019

Last NPPES UpdateSeptember 9, 20262 updates tracked since enumeration

NPPES CertifiedSeptember 9, 2026

✔ NPI 1861049520 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers

Taxonomy Code101YM0800X

License✔ Licensed in TX · 38298

4100 SUMMERHILL RD, Texarkana, TX 75503

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mari Varga Overlock Ph. D. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Mari Overlock reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Mental Health Services Of Texarkana PLLC

Same address

Mental Health

4100 SUMMERHILL RD
Texarkana, TX 75503

Reassigned Medicare billing, Texas enrollment

NPI 1346178811 (903) 277-8531

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MR. BRANDON WILEY C.R.N.A.