STACY YUN PHD
NPI 1205713831
Psychologist - Clinical in Menlo Park, CA

Q: What is Stacy Yun's NPI number?

The NPI number for Stacy Yun is 1205713831. It was assigned to this individual provider in the NPPES registry on August 18, 2025. The provider is also known as Stacy Wonkyung Yun Phd.

Q: What is Stacy Yun'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 Stacy Yun was last updated on July 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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 August 18, 2025PECOS Enrolled

795 WILLOW RD BLDG 324, MENLO PARK, CA 94025(650) 614-9825 Get Directions Write a Review

NPPES record last updated: July 7, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jul 7, 2026, Apr 6, 2026 (2 updates tracked since 2026).

On this page

About Stacy Yun Phd NPPES

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

STACY YUN PHD (NPI 1205713831) is an individual clinical provider in Menlo Park, California, licensed in Colorado (PSY.0006500) and active in the NPI registry since August 2025. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (2023).

NPPES Registry Identity

NPI1205713831

Entity TypeIndividualFemale

Primary Taxonomy103TC0700X

Provider Legal NameSTACY YUNCredential: PHD

Location Address795 WILLOW RD BLDG 324Menlo Park, CA 94025-2539

Mailing Address1450 Oak Creek Dr Apt 406Palo Alto, CA 94304-2027 · (213) 222-7196

Phone(650) 614-9825

Sole ProprietorYes

Medical School CMSOtherGraduated 2023

Enumeration DateAugust 18, 2025

Last NPPES UpdateJuly 7, 20262 updates tracked since enumeration

NPPES CertifiedJuly 7, 2026

✔ NPI 1205713831 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code103TC0700X

Licenses✔ Licensed in CO · PSY.0006500✔ Licensed in CA · PSY36191

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.

795 WILLOW RD BLDG 324, Menlo Park, CA 94025

Open in Google Maps ↗

Other Names 1

Other Name (5)Stacy Wonkyung Yun Phd

Secondary Practice Locations 3

Location 11990 N California Blvd Ste 800Walnut Creek, CA 94596-7261 · Phone (858) 208-0380

Location 284 W Santa Clara St Ste 700San Jose, CA 95113-1809 · Phone (858) 208-0380 · Fax (833) 643-0973

Location 3374 N Coast Highway 101Encinitas, CA 92024-2542 · Phone (858) 367-7274

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Stacy Yun Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6305316100

PECOS Enrollment IDI20260521002637

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 Stacy Yun reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Grounded Therapy, A Psychology Corp

410 mi

Clinical

374 N COAST HIGHWAY 101
Encinitas, CA 92024

Reassigned Medicare billing, California enrollment
9 clinicians in this Medicare group

NPI 1043836505 (858) 208-0380

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 94025 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

$202.35 typical visit price

range $69.00 – $202.35

Typical copayment $50.58 (range $17.25 – $50.58)

Most-billed visit code 99205

Established Patient

$119.48 typical visit price

range $23.44 – $166.46

Typical copayment $29.87 (range $5.86 – $41.61)

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 2

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

AARON DAVID STUMPF

Psychologist (Counseling)

795 WILLOW RD BLDG 324
MENLO PARK, CA 94025

San Mateo County (650) 617-4300

FRIDA DOLORES GUTIERREZ

Social Worker

795 WILLOW RD BLDG 324
MENLO PARK, CA 94025

San Mateo County (650) 493-5000

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 Stacy Yun's NPI number?

The NPI number for Stacy Yun is 1205713831. It was assigned to this individual provider in the NPPES registry on August 18, 2025. The provider is also known as Stacy Wonkyung Yun Phd.

Where is Stacy Yun located?

Stacy Yun practices at 795 Willow Rd Bldg 324, Menlo Park, CA 94025. The listed phone number is (650) 614-9825.

What is Stacy Yun's specialty?

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

Is Stacy Yun enrolled in Medicare?

Yes. Stacy Yun is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Stacy Yun's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stacy Yun reassigns Medicare benefits to Grounded Therapy, A Psychology Corp (Encinitas, CA). 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 Stacy Yun'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 Stacy Yun was last updated on July 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.