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CHARLES E WILLIAMSON NP
NPI 1740446335
Nurse Practitioner - Psychiatric/Mental Health in Portland, OR

Active since August 02, 2008PECOS Enrolled
2119 NE HALSEY ST, PORTLAND, OR 97232(503) 975-9398(503) 221-8320 Get Directions Write a Review

NPPES record last updated: October 1, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Sep 8, 2025, Mar 27, 2025, Dec 30, 2024 and 2 more (5 updates tracked since 2023).

About Charles E Williamson Np NPPES

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

CHARLES E WILLIAMSON NP (NPI 1740446335) is an individual psychiatric/mental health provider in Portland, Oregon, licensed in Oregon (202114724NP-PP) and active in the NPI registry since August 2008. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1740446335
Entity TypeIndividualMale
Primary Taxonomy363LP0808X
Provider Legal NameCHARLES E WILLIAMSONCredential: NP
Location Address2119 NE HALSEY STPortland, OR 97232-1522
Mailing Address2119 Ne Halsey StPortland, OR 97232-1522 · (503) 975-9398 · Fax (503) 221-8320
Phone(503) 975-9398
Fax(503) 221-8320
Sole ProprietorNo
Enumeration DateAugust 2, 2008
Last NPPES UpdateOctober 1, 20255 updates tracked since enumeration
NPPES CertifiedOctober 1, 2025
✔ NPI 1740446335 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LP0808X
License✔ Licensed in OR · 202114724NP-PP
Also ListedNurse Practitioner · Adult HealthTaxonomy 363LA2200X · License 202114724NP-PP (OR)
2119 NE HALSEY ST, Portland, OR 97232
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Moda Health Plan, Inc..Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Charles E Williamson Np 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 Reassignments

2

Medicare enrollment records show Charles Williamson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ucsf Medical Group Business Services
536 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94122
  • Reassigned Medicare billing, California enrollment
  • 5,544 clinicians in this Medicare group
NPI 1477624104 (415) 353-2808
University Of California San Francisco
536 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 5,645 clinicians in this Medicare group
NPI 1164512851 (415) 476-1000

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 97232 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
$90.51 typical visit price
range $58.99 – $176.88
Typical copayment $22.62 (range $14.74 – $44.22)
Most-billed visit code 99203
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 7

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JAMES CHRISTOPHER PERDUE CRNP
Nurse Practitioner (Family)
2119 NE HALSEY ST
PORTLAND, OR 97232
Multnomah County (503) 975-9398
DR. PIERRE-CEDRIC BERNARD CROUCH PHD,ANP-BC,PMHNP-BC
Nurse Practitioner (Psychiatric/Mental Health)
2119 NE HALSEY ST
PORTLAND, OR 97232
Multnomah County (503) 427-8006
BYWATER HEALTH, LLC
Clinic/Center (Primary Care)
2119 NE HALSEY ST
PORTLAND, OR 97232
Multnomah County (503) 975-9398
DR. MARY CASELLI PC
Naturopath
2119 NE HALSEY ST
PORTLAND, OR 97232
Multnomah County (503) 335-8983
PINK WELLNESS, LLC
Nurse Practitioner (Psychiatric/Mental Health)
2119 NE HALSEY ST
PORTLAND, OR 97232
Multnomah County (503) 427-8006
DR. JOSEPH ANTHONY CIMINO
Chiropractor
2119 NE HALSEY ST
PORTLAND, OR 97232
Multnomah County (503) 236-2000
YAZVAC CHIROPRACTIC ASSOCIATES
Chiropractor (Rehabilitation)
2119 NE HALSEY ST
PORTLAND, OR 97232
Multnomah County (503) 249-2121

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 Charles Williamson's NPI number?

The NPI number for Charles Williamson is 1740446335. It was assigned to this individual provider in the NPPES registry on August 2, 2008.

Where is Charles Williamson located?

Charles Williamson practices at 2119 NE Halsey St, Portland, OR 97232. The listed phone number is (503) 975-9398.

What is Charles Williamson's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Is Charles Williamson enrolled in Medicare?

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

Which organizations bill Medicare for Charles Williamson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Charles Williamson reassigns Medicare benefits to 2 organizations: Ucsf Medical Group Business Services (San Francisco, CA) and University Of California San Francisco (San Francisco, CA). Each 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 Charles Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Charles Williamson accept?

Health plans from Moda Health Plan, Inc. list Charles Williamson 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 Charles Williamson was last updated on October 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.