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WESTWATER DIAGNOSTICS PLLC
NPI 1003413139
Pathology - Anatomic Pathology & Clinical Pathology in Houston, TX

Active since October 01, 2020
3732 GLEN HAVEN BLVD, HOUSTON, TX 77025(713) 559-6929(713) 559-6928 Get Directions Write a Review

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

About Westwater Diagnostics Pllc NPPES

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

WESTWATER DIAGNOSTICS PLLC (NPI 1003413139) is a healthcare organization registered as an anatomic pathology & clinical pathology in Houston, Texas and active in the NPI registry since October 2020. The organization lists Mhair Dekmezian, Authorizing Official, as its authorized official.

NPPES Registry Identity

NPI1003413139
Entity TypeOrganization
Primary Taxonomy207ZP0102X
Legal Business NameWESTWATER DIAGNOSTICS PLLC
Location Address3732 GLEN HAVEN BLVDHouston, TX 77025-1205
Mailing Address3732 Glen Haven BlvdHouston, TX 77025-1205 · (713) 559-6929 · Fax (713) 559-6928
Phone(713) 559-6929
Fax(713) 559-6928
Organization SubpartNo
Authorized OfficialMhair DekmezianAuthorizing Official · (713) 559-6929
Enumeration DateOctober 1, 2020
Last NPPES UpdateFebruary 9, 2026
NPPES CertifiedFebruary 9, 2026
✔ NPI 1003413139 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
3732 GLEN HAVEN BLVD, Houston, TX 77025
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Westwater Diagnostics Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

6

Medicare enrollment records show 6 clinicians reassign Medicare billing to Westwater Diagnostics PLLC, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 3 within 10 miles. They are listed nearest first.

Clinicians, nearest first (6)

Mhair Dekmezian, MD
Pathology
NPI 1518301613
3732 GLEN HAVEN BLVD
Houston, TX 77025
(713) 568-6263
✔ PECOS✔ Accepts MedicareSame address
Roupen Dekmezian, M.D.
Pathology
NPI 1285638668
1919 LA BRANCH ST
Houston, TX 77002
(713) 481-3535
✔ PECOS✔ Accepts Medicare5.2 mi
John Cangelosi, MD
Pathology
NPI 1831393438
4131 DIRECTORS ROW
Houston, TX 77092
(877) 697-2447
✔ PECOS✔ Accepts Medicare7.3 mi
Mario Cervantes Vazquez, M.D.
Pathology
NPI 1245234616
22999 HIGHWAY 59 N
Kingwood, TX 77339
(281) 348-8279
✔ PECOS✔ Accepts Medicare26 mi
Vicki Chu, MD
Pathology
NPI 1588972079
6801 EMMETT F LOWRY EXPY
Texas City, TX 77591
(310) 218-8961
✔ PECOS✔ Accepts Medicare34 mi
John Joseph, MD
Pathology
NPI 1003131038
535 E CRESCENT AVE HISTOPATHOLOGY SERVICES, LLC
Ramsey, NJ 07446
(201) 661-7280
✔ PECOS✔ Accepts Medicare1,430 mi

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

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Westwater Diagnostics PLLC's NPI number?

The NPI number for Westwater Diagnostics PLLC is 1003413139. It was assigned to this organization in the NPPES registry on October 1, 2020.

Where is Westwater Diagnostics PLLC located?

Westwater Diagnostics PLLC is located at 3732 Glen Haven Blvd, Houston, TX 77025. The listed phone number is (713) 559-6929.

What is Westwater Diagnostics PLLC's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Westwater Diagnostics PLLC enrolled in Medicare?

Yes. Westwater Diagnostics PLLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Westwater Diagnostics PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 6 clinicians, all in Pathology, reassign their Medicare billing to Westwater Diagnostics PLLC. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 1 practice at this address and 3 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Westwater Diagnostics PLLC was last updated on February 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months 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.