DR. ARIEL WILLIAMSON PHD
NPI 1841793825
Psychologist - Clinical in Portland, OR

Q: What is Ariel Williamson's NPI number?

The NPI number for Ariel Williamson is 1841793825. It was assigned to this individual provider in the NPPES registry on March 15, 2018.

Q: What is Ariel Williamson's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Q: When was this NPI record last updated?

The NPPES record for Ariel Williamson was last updated on January 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 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.

Active since March 15, 2018PECOS Enrolled

3181 SW SAM JACKSON PARK RD, PORTLAND, OR 97239(800) 452-3563(503) 494-4447 Get Directions Write a Review

NPPES record last updated: January 7, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Jan 7, 2025, Mar 15, 2018 (2 updates tracked since 2018).

On this page

About Dr. Ariel Williamson Phd NPPES

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

DR. ARIEL WILLIAMSON PHD (NPI 1841793825) is an individual clinical provider in Portland, Oregon, licensed in Oregon (3859) and active in the NPI registry since March 2018. She is enrolled in Medicare PECOS and maintains a secondary practice location in Philadelphia.

NPPES Registry Identity

NPI1841793825

Entity TypeIndividualFemale

Primary Taxonomy103TC0700X

Provider Legal NameDR. ARIEL WILLIAMSONCredential: PHD

Location Address3181 SW SAM JACKSON PARK RDPortland, OR 97239-3011

Mailing Address3181 Sw Sam Jackson Park RdPortland, OR 97239-3011 · (800) 452-3563 · Fax (503) 494-4447

Phone(800) 452-3563

Fax(503) 494-4447

Sole ProprietorYes

Enumeration DateMarch 15, 2018

Last NPPES UpdateJanuary 7, 20252 updates tracked since enumeration

NPPES CertifiedJanuary 7, 2025

✔ NPI 1841793825 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code103TC0700X

License✔ Licensed in OR · 3859

Definition

A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.

Also ListedPsychologistTaxonomy 103T00000X

3181 SW SAM JACKSON PARK RD, Portland, OR 97239

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Secondary Practice Location 1

Location 13440 Market St Ste 410Philadelphia, PA 19104-3338 · Phone (215) 590-7532 · Fax (215) 590-4251

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ariel Williamson Phd 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 Ariel Williamson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Professional Services

Same address

General Practice

3181 SW SAM JACKSON PARK RD
Portland, OR 97239

Reassigned Medicare billing, Oregon enrollment
2,212 clinicians in this Medicare group

NPI 1376709535 (503) 494-8311

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 97239 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

$176.88 typical visit price

range $58.99 – $176.88

Typical copayment $44.22 (range $14.74 – $44.22)

Most-billed visit code 99205

Established Patient

$103.51 typical visit price

range $19.32 – $144.79

Typical copayment $25.87 (range $4.83 – $36.19)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

DONALD RICHARD SULLIVAN MD

Internal Medicine (Pulmonary Disease)

3181 SW SAM JACKSON PARK RD, UHN67
PORTLAND, OR 97239

Multnomah County (503) 494-6949

MRS. ANJALEE NIX ROWE NP

Nurse Practitioner (Acute Care)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-3988

REEM HASAN MD

Internal Medicine

3181 SW SAM JACKSON PARK RD, PPV 350
PORTLAND, OR 97239

Multnomah County (503) 494-8562

DR. AMANDA D BALL PSY.D

Psychologist (Clinical)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-6176

SUNSHINE WELSCH LMT

Massage Therapist

3181 SW SAM JACKSON PARK RD, 7D19
PORTLAND, OR 97239

Multnomah County (503) 494-8349

DR. ROBERT GENE MEALER M.D., PH.D.

Psychiatry & Neurology (Psychiatry)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-6176

GREGORY HALL MD

Radiology (Diagnostic Radiology)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 418-0990

DR. BURHAN AHMED MIAN MD

Student in an Organized Health Care Education/Training Program

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-8311

KARINA RAE ESPANA MD

Psychiatry & Neurology (Psychiatry)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-8311

CLAIRE SAHLBERG RUGGERI MD

Pediatrics

3181 SW SAM JACKSON PARK RD, OHSU
PORTLAND, OR 97239

Multnomah County (503) 494-8220

KIMBERLY LAUREN IMBESI MD

Emergency Medicine

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-8211

ANN PERRIN

Student in an Organized Health Care Education/Training Program

3181 SW SAM JACKSON PARK RD, OHSU
PORTLAND, OR 97239

Multnomah County (503) 494-8211

KRIS KUMAR

Internal Medicine (Interventional Cardiology)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-8311

SARAH POWER LCSW

Social Worker (Clinical)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-0849

SHAHRZAD SHARAFI MD

Radiology (Diagnostic Radiology)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 418-0990

JULIE MARIE MARTIN

Dietitian, Registered

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-5466

DR. SONYA FABRICANT MD

Obstetrics & Gynecology (Maternal & Fetal Medicine)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 418-4500

BRENDA BONILLA

Social Worker (Clinical)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-2273

KAYLEE PURPURA

Otolaryngology

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-8510

MOLLY ANDERSON PA-C

Physician Assistant (Medical)

3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239

Multnomah County (503) 494-4910

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 Ariel Williamson's NPI number?

The NPI number for Ariel Williamson is 1841793825. It was assigned to this individual provider in the NPPES registry on March 15, 2018.

Where is Ariel Williamson located?

Ariel Williamson practices at 3181 SW Sam Jackson Park Rd, Portland, OR 97239. The listed phone number is (800) 452-3563.

What is Ariel Williamson's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is Ariel Williamson enrolled in Medicare?

Yes. Ariel Williamson is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Ariel Williamson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ariel Williamson reassigns Medicare benefits to University Professional Services (Portland, OR). 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 Ariel Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ariel Williamson was last updated on January 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 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.