ILKA LOUISE DE GAST PSYD
NPI 1649576851
Psychologist in Santa Rosa, CA

Active since February 04, 2011PECOS EnrolledAccepts Medicare Assignment
3569 ROUND BARN CIR, SANTA ROSA, CA 95403(707) 547-2222(707) 527-0472 Get Directions Write a Review

NPPES record last updated: May 13, 2014. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Ilka Louise De Gast Psyd NPPES

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

ILKA LOUISE DE GAST PSYD (NPI 1649576851) is an individual psychologist in Santa Rosa, California, licensed in California (PSY24409) and active in the NPI registry since February 2011. She is enrolled in Medicare PECOS and is a graduate of Other (2007).

NPPES Registry Identity

NPI1649576851
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameILKA LOUISE DE GASTCredential: PSYD
Location Address3569 ROUND BARN CIRSanta Rosa, CA 95403-1757
Mailing Address3569 Round Barn CirSanta Rosa, CA 95403-1757 · (707) 547-2222 · Fax (707) 527-0472
Fax(707) 527-0472
Sole ProprietorYes
Medical School CMSOtherGraduated 2007
Enumeration DateFebruary 4, 2011
Last NPPES UpdateMay 13, 2014
✔ NPI 1649576851 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License✔ Licensed in CA · PSY24409
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.
Also ListedCounselor · Mental HealthTaxonomy 101YM0800X · License PSB33686 (CA)
3569 ROUND BARN CIR, Santa Rosa, CA 95403

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Ilka Louise De Gast Psyd is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7618192030
PECOS Enrollment IDI20140627000211
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 Ilka De Gast reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Federally Qualified Health Center (FQHC)
3569 ROUND BARN CIRCLE
Santa Rosa, CA 95403
  • Reassigned Medicare billing, California enrollment
  • 215 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 20

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

Family Medicine
3569 ROUND BARN CIR
SANTA ROSA, CA 95403
Family Medicine
3569 ROUND BARN CIR
SANTA ROSA, CA 95403
Nurse Practitioner
3569 ROUND BARN CIR
SANTA ROSA, CA 95403
Nurse Practitioner (Psychiatric/Mental Health)
3569 ROUND BARN CIR
SANTA ROSA, CA 95403
Family Medicine
3569 ROUND BARN CIR, SUITE 200
SANTA ROSA, CA 95403
Family Medicine
3569 ROUND BARN CIR
SANTA ROSA, CA 95403
Counselor (Professional)
3569 ROUND BARN CIR
SANTA ROSA, CA 95403
Family Medicine
3569 ROUND BARN CIR
SANTA ROSA, CA 95403

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 Ilka De Gast's NPI number?

The NPI number for Ilka De Gast is 1649576851. It was assigned to this individual provider in the NPPES registry on February 4, 2011.

Where is Ilka De Gast located?

Ilka De Gast practices at 3569 Round Barn Cir, Santa Rosa, CA 95403. The listed phone number is (707) 547-2222.

What is Ilka De Gast's specialty?

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

Is Ilka De Gast enrolled in Medicare?

Yes. Ilka De Gast is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Ilka De Gast's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ilka De Gast reassigns Medicare benefits to Santa Rosa Community Health Centers (Santa Rosa, 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 Ilka De Gast'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 Ilka De Gast was last updated on May 13, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.