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MARIA KELLY WALKER OD
NPI 1902196876
Optometrist in Houston, TX

Active since April 13, 2011PECOS EnrolledAccepts Medicare Assignment
4401 MARTIN LUTHER KING BLVE, HOUSTON, TX 77204(713) 743-2020(713) 743-0963 Get Directions Write a Review

NPPES record last updated: May 11, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 11, 2022, Jan 18, 2016 (2 updates tracked since 2016).

About Maria Kelly Walker Od NPPES

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

MARIA KELLY WALKER OD (NPI 1902196876) is an individual optometrist in Houston, Texas, licensed in Texas (8771) and active in the NPI registry since April 2011. She is enrolled in Medicare PECOS and is a graduate of New England College Of Optometry (2013).

NPPES Registry Identity

NPI1902196876
Entity TypeIndividualFemale
Primary Taxonomy152W00000X
Provider Legal NameMARIA KELLY WALKERCredential: OD
Location Address4401 MARTIN LUTHER KING BLVEHouston, TX 77204-2020
Mailing Address4401 Martin Luther King BlveHouston, TX 77204-2020 · (713) 743-2020 · Fax (713) 743-0963
Phone(713) 743-2020
Fax(713) 743-0963
Sole ProprietorYes
Medical School CMSNew England College Of OptometryGraduated 2013
Enumeration DateApril 13, 2011
Last NPPES UpdateMay 11, 20222 updates tracked since enumeration
NPPES CertifiedMay 11, 2022
✔ NPI 1902196876 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers
Taxonomy Code152W00000X
Licenses✔ Licensed in TX · 8771✔ Licensed in TX · 8771T
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.
4401 MARTIN LUTHER KING BLVE, Houston, TX 77204
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Other Identifiers 2

Medicaid339290401TX
Medicaid112409104TX

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Maria Kelly Walker Od is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5193969939
PECOS Enrollment IDI20141015002000
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 Maria Walker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Of Houston System
9.6 mi
Speech-Language Pathologist
100 CLINIC RESEARCH SERVICES
Houston, TX 77204
  • Reassigned Medicare billing, Texas enrollment
  • 75 clinicians in this Medicare group
NPI 1447371430 (713) 743-2898

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77204 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$134.06 typical visit price
range $58.24 – $176.98
Typical copayment $33.51 (range $14.56 – $44.24)
Most-billed visit code 99204
Established Patient
$72.62 typical visit price
range $18.60 – $143.93
Typical copayment $18.15 (range $4.65 – $35.98)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Maria Walker's NPI number?

The NPI number for Maria Walker is 1902196876. It was assigned to this individual provider in the NPPES registry on April 13, 2011.

Where is Maria Walker located?

Maria Walker practices at 4401 Martin Luther King Blve, Houston, TX 77204. The listed phone number is (713) 743-2020.

What is Maria Walker's specialty?

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

Is Maria Walker enrolled in Medicare?

Yes. Maria Walker is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Maria Walker's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Maria Walker reassigns Medicare benefits to University Of Houston System (Houston, TX). The 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 Maria Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Maria Walker accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 16 other insurers list Maria Walker 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 Maria Walker was last updated on May 11, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.