DR. GARY ALAN WALCO PHD
NPI 1821040700
Psychologist - Health Service in Seattle, WA

Q: What is Gary Walco's NPI number?

The NPI number for Gary Walco is 1821040700. It was assigned to this individual provider in the NPPES registry on May 17, 2006.

Q: What is Gary Walco's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Gary Walco was last updated on July 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.

Active since May 17, 2006PECOS Enrolled

4800 SAND POINT WAY NE, SEATTLE CHILDREN'S HOSPITAL, SEATTLE, WA 98105(206) 987-2704(206) 987-3935 Get Directions Write a Review

NPPES record last updated: July 17, 2018. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Dr. Gary Alan Walco Phd NPPES

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

DR. GARY ALAN WALCO PHD (NPI 1821040700) is an individual health service provider in Seattle, Washington, licensed in Washington (60066173) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1821040700

Entity TypeIndividualMale

Primary Taxonomy103TH0100X

Provider Legal NameDR. GARY ALAN WALCOCredential: PHD

Location Address4800 SAND POINT WAY NE, SEATTLE CHILDREN'S HOSPITALSeattle, WA 98105

Mailing Address4800 Sand Point Way Ne, Seattle Children's HospitalSeattle, WA 98105-3901 · (206) 987-2704 · Fax (206) 987-3935

Phone(206) 987-2704

Fax(206) 987-3935

Sole ProprietorNo

Enumeration DateMay 17, 2006

Last NPPES UpdateJuly 17, 2018

✔ NPI 1821040700 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyPsychologist · Health ServiceBehavioral Health & Social Service Providers

Taxonomy Code103TH0100X

License✔ Licensed in WA · 60066173

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 · Clinical Child & AdolescentTaxonomy 103TC2200X · License PY 60066173 (WA)

Also ListedPsychologist · HealthTaxonomy 103TH0004X · License PY 60066173 (WA)

4800 SAND POINT WAY NE, Seattle, WA 98105

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Gary Alan Walco 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 Gary Walco reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Association Of Chmc And University Physicians

0.1 mi

Trauma Surgery

4800 SAND POINT WAY NE
Seattle, WA 98105

Reassigned Medicare billing, Washington enrollment
Medicare enrollment name: The Association Of Chrmc And University Physicians
1,443 clinicians in this Medicare group

NPI 1649497827 (206) 987-2000

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 20

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

NALINI MALARKKAN MD

Anesthesiology

4800 SAND POINT WAY NE
SEATTLE, WA 98105

King County (206) 987-2728

MS. LINDA E EBLEN MA

Speech-Language Pathologist

4800 SAND POINT WAY NE, MAIL STOP W-6839
SEATTLE, WA 98105

King County (206) 987-6164

DR. JAMES TOLIVER BENNETT JR. M.D., PH.D.

Medical Genetics (Clinical Molecular Genetics)

4800 SAND POINT WAY NE, GENETIC MEDICINE
SEATTLE, WA 98105

King County (206) 987-2056

DR. LESLIE ANN DERVAN MD

Pediatrics (Pediatric Critical Care Medicine)

4800 SAND POINT WAY NE, MB.10.620
SEATTLE, WA 98105

King County (206) 987-0293

DR. INDI TREHAN MD

Pediatrics (Pediatric Infectious Diseases)

4800 SAND POINT WAY NE
SEATTLE, WA 98105

King County (206) 987-2000

MS. JENNIFER PATANO CNP

Nurse Practitioner (Pediatrics)

4800 SAND POINT WAY NE, MS O.7.720
SEATTLE, WA 98105

King County (206) 987-8949

MRS. SUSAN L HOLTZCLAW ARNP

Nurse Practitioner (Family)

4800 SAND POINT WAY NE, MAILSTOP T-2108
SEATTLE, WA 98105

King County (206) 987-5691

SHENG ZHOU MD

Otolaryngology (Pediatric Otolaryngology)

4800 SAND POINT WAY NE
SEATTLE, WA 98105

King County (206) 987-2105

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 Gary Walco's NPI number?

The NPI number for Gary Walco is 1821040700. It was assigned to this individual provider in the NPPES registry on May 17, 2006.

Where is Gary Walco located?

Gary Walco practices at 4800 Sand Point Way NE Seattle Children's Hospital, Seattle, WA 98105. The listed phone number is (206) 987-2704.

What is Gary Walco's specialty?

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

Is Gary Walco enrolled in Medicare?

Yes. Gary Walco is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Gary Walco's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gary Walco reassigns Medicare benefits to Association Of Chmc And University Physicians (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 Gary Walco'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 Gary Walco was last updated on July 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.