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MR. BARRETT WILLIAMS PHD
NPI 1154474054
Psychologist - Health Service in Tulsa, OK

Active since January 22, 2007PECOS EnrolledAccepts Medicare Assignment
5310 E 31ST ST STE 13, TULSA, OK 74135(918) 236-4000(918) 236-4001 Get Directions Write a Review

NPPES record last updated: September 25, 2024. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Sep 25, 2024, Feb 14, 2017 (2 updates tracked since 2017).

About Mr. Barrett Williams Phd NPPES

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

MR. BARRETT WILLIAMS PHD (NPI 1154474054) is an individual health service provider in Tulsa, Oklahoma, licensed in Oklahoma (1466) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS and is a graduate of Other (2023).

NPPES Registry Identity

NPI1154474054
Entity TypeIndividualMale
Primary Taxonomy103TH0100X
Provider Legal NameMR. BARRETT WILLIAMSCredential: PHD
Location Address5310 E 31ST ST STE 13Tulsa, OK 74135-5013
Mailing Address5310 E 31st St Ste 13Tulsa, OK 74135-5013 · (918) 561-5701 · Fax (918) 561-1173
Phone(918) 236-4000
Fax(918) 236-4001
Sole ProprietorNo
Medical School CMSOtherGraduated 2023
Enumeration DateJanuary 22, 2007
Last NPPES UpdateSeptember 25, 20242 updates tracked since enumeration
NPPES CertifiedSeptember 25, 2024
✔ NPI 1154474054 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychologist · Health ServiceBehavioral Health & Social Service Providers
Taxonomy Code103TH0100X
License✔ Licensed in OK · 1466
Definition
A psychologist, certified/licensed at the independent practice level in his/her state, who is duly trained and experienced in the delivery of direct, preventative, assessment, and therapeutic intervention services to individuals whose growth, adjustment, or functioning is actually impaired or is demonstrably at high risk of impairment (1974).
Also ListedPsychologist · CounselingTaxonomy 103TC1900X · License 1466 (OK)
5310 E 31ST ST STE 13, Tulsa, OK 74135
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter from Superior HealthPlan 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

Mr. Barrett Williams Phd 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 ID9931631124
PECOS Enrollment IDI20241012000327
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 Barrett Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Oklahoma State University
5.0 mi
Medical Specialty
2345 SOUTHWEST BLVD
Tulsa, OK 74107
  • Reassigned Medicare billing, Oklahoma enrollment
  • 171 clinicians in this Medicare group
NPI 1306882261 (918) 561-5701

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 Barrett Williams's NPI number?

The NPI number for Barrett Williams is 1154474054. It was assigned to this individual provider in the NPPES registry on January 22, 2007.

Where is Barrett Williams located?

Barrett Williams practices at 5310 E 31st St Ste 13, Tulsa, OK 74135. The listed phone number is (918) 236-4000.

What is Barrett Williams's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Health Service, with taxonomy code 103TH0100X.

Is Barrett Williams enrolled in Medicare?

Yes. Barrett Williams 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 Barrett Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Barrett Williams reassigns Medicare benefits to Oklahoma State University (Tulsa, OK). 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 Barrett Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Barrett Williams accept?

Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 5 other insurers list Barrett Williams 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 Barrett Williams was last updated on September 25, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.