TSO RIVERSTONE
NPI 1457844227
Optometrist in Sugar Land, TX

Q: What is Underwood Eye Associates, PLLC's NPI number?

The NPI number for Underwood Eye Associates, PLLC is 1457844227. It was assigned to this organization in the NPPES registry on June 7, 2018. The provider is doing business as Tso Riverstone.

Q: What is Underwood Eye Associates, PLLC's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Active since June 07, 2018

18851 UNIVERSITY BLVD, SUITE 220, SUGAR LAND, TX 77479(832) 305-6590 Get Directions Write a Review

NPPES record last updated: June 8, 2018. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Tso Riverstone NPPES

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

TSO RIVERSTONE (NPI 1457844227) is a healthcare organization registered as an optometrist in Sugar Land, Texas and active in the NPI registry since June 2018. The organization lists Eric K Underwood, Partner, as its authorized official.

NPPES Registry Identity

NPI1457844227

Entity TypeOrganization

Primary Taxonomy152W00000X

Legal Business NameUNDERWOOD EYE ASSOCIATES, PLLC

Location Address18851 UNIVERSITY BLVD, SUITE 220Sugar Land, TX 77479

Mailing Address6042 Cheena DrHouston, TX 77096-4710 · (412) 508-1289

Phone(832) 305-6590

Organization SubpartNo

Authorized OfficialEric K UnderwoodPartner · (832) 305-6590

Enumeration DateJune 7, 2018

Last NPPES UpdateJune 8, 2018

✔ NPI 1457844227 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers

Taxonomy Code152W00000X

License✔ Licensed in TX · 8293TG

Definition

Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.

18851 UNIVERSITY BLVD, Sugar Land, TX 77479

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Other Names 1

Doing Business AsTso Riverstone

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

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of Louisiana, Blue Cross and Blue Shield of Montana and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Tso Riverstone is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Tso Riverstone, which bills Medicare for the services this clinician delivers.

Clinician (1)

Phong Pham, O.D.

Optometry

NPI 1750636064

10117 W GRAND PKWY S STE 101
Richmond, TX 77407

(832) 781-2020

✔ PECOS✔ Accepts Medicare10 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 Underwood Eye Associates, PLLC's NPI number?

The NPI number for Underwood Eye Associates, PLLC is 1457844227. It was assigned to this organization in the NPPES registry on June 7, 2018. The provider is doing business as Tso Riverstone.

Where is Underwood Eye Associates, PLLC located?

Underwood Eye Associates, PLLC is located at 18851 University Blvd Suite 220, Sugar Land, TX 77479. The listed phone number is (832) 305-6590.

What is Underwood Eye Associates, PLLC's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Is Underwood Eye Associates, PLLC enrolled in Medicare?

Yes. Underwood Eye Associates, PLLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Underwood Eye Associates, PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Optometry) reassigns their Medicare billing to Underwood Eye Associates, 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

What insurance does Underwood Eye Associates, PLLC accept?

Health plans from Anthem Blue Cross and Blue Shield, Blue Cross Blue Shield of Wyoming, Blue Cross and Blue Shield of Louisiana, Blue Cross and Blue Shield of Montana and Blue Cross and Blue Shield of Oklahoma and 2 other insurers list Underwood Eye Associates, PLLC as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Underwood Eye Associates, PLLC was last updated on June 8, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years 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.