Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MRS. JOANNA STAGG MA, PSYD
NPI 1184938144
Psychologist in Seattle, WA

Active since August 02, 2010PECOS Enrolled
5150 S ORCAS ST, SEATTLE, WA 98118(206) 580-3160 Get Directions Write a Review

NPPES record last updated: September 24, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Mrs. Joanna Stagg Ma, Psyd NPPES

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

MRS. JOANNA STAGG MA, PSYD (NPI 1184938144) is an individual psychologist in Seattle, Washington, licensed in Washington (PY60190304) and active in the NPI registry since August 2010. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1184938144
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameMRS. JOANNA STAGGCredential: MA, PSYD
Location Address5150 S ORCAS STSeattle, WA 98118-2561
Mailing Address5150 S Orcas StSeattle, WA 98118-2561 · (206) 580-3160
Sole ProprietorNo
Enumeration DateAugust 2, 2010
Last NPPES UpdateSeptember 24, 2026
NPPES CertifiedSeptember 24, 2026
✔ NPI 1184938144 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License✔ Licensed in WA · PY60190304
Definition
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
5150 S ORCAS ST, Seattle, WA 98118

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mrs. Joanna Stagg Ma, Psyd 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 Joanna Stagg reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Multi-Specialty
320 WESTLAKE AVE. N., SUITE 100
Seattle, WA 98109
  • Reassigned Medicare billing, Washington enrollment
  • 2,678 clinicians in this Medicare group

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

Other Providers at the Same Location NPPES

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

Psychologist (Clinical)
5150 S ORCAS ST
SEATTLE, WA 98118

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 Joanna Stagg's NPI number?

The NPI number for Joanna Stagg is 1184938144. It was assigned to this individual provider in the NPPES registry on August 2, 2010.

Where is Joanna Stagg located?

Joanna Stagg practices at 5150 S Orcas St, Seattle, WA 98118. The listed phone number is (206) 580-3160.

What is Joanna Stagg's specialty?

The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.

Is Joanna Stagg enrolled in Medicare?

Yes. Joanna Stagg is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Joanna Stagg's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Joanna Stagg reassigns Medicare benefits to Kaiser Foundation Health Plan Of Washington (Seattle, WA). 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 Joanna Stagg'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 Joanna Stagg was last updated on September 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 days 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.