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HASMIG TATIOSSIAN LCSW
NPI 1659080695
Social Worker in Santa Rosa, CA

Active since November 18, 2022PECOS EnrolledAccepts Medicare Assignment
2225 CHALLENGER WAY, SANTA ROSA, CA 95407(707) 565-6900 Get Directions Write a Review

NPPES record last updated: January 14, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 14, 2026, Nov 18, 2022 (2 updates tracked since 2022).

About Hasmig Tatiossian Lcsw NPPES

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

HASMIG TATIOSSIAN LCSW (NPI 1659080695) is an individual social worker in Santa Rosa, California, licensed in California (125498) and active in the NPI registry since November 2022. She is enrolled in Medicare PECOS and is a graduate of Other (2020).

NPPES Registry Identity

NPI1659080695
Entity TypeIndividualFemale
Primary Taxonomy104100000X
Provider Legal NameHASMIG TATIOSSIANCredential: LCSW
Location Address2225 CHALLENGER WAYSanta Rosa, CA 95407-5441
Mailing AddressPo Box 1347Rohnert Park, CA 94927-1347 · (818) 730-8130
Phone(707) 565-6900
Sole ProprietorNo
Medical School CMSOtherGraduated 2020
Enumeration DateNovember 18, 2022
Last NPPES UpdateJanuary 14, 20262 updates tracked since enumeration
NPPES CertifiedJanuary 14, 2026
✔ NPI 1659080695 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial WorkerBehavioral Health & Social Service Providers
Taxonomy Code104100000X
License✔ Licensed in CA · 125498
Definition
A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.
2225 CHALLENGER WAY, Santa Rosa, CA 95407
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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 and accepts Medicare assignment

Hasmig Tatiossian Lcsw 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 ID6608301197
PECOS Enrollment IDI20241120003041
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 Hasmig Tatiossian reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

County Of Sonoma
Same address
Mental Health (Including Community Mental Health Center)
2225 CHALLENGER WAY
Santa Rosa, CA 95407
  • Reassigned Medicare billing, California enrollment
  • 64 clinicians in this Medicare group
NPI 1154537512 (707) 565-6950

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.

RACHEL J AVILA
Counselor (Addiction (Substance Use Disorder))
2225 CHALLENGER WAY
SANTA ROSA, CA 95407
Sonoma County (707) 565-5510
MRS. LUCILLE A CAPO ROME NP
Registered Nurse (Psychiatric/Mental Health, Adult)
2225 CHALLENGER WAY
SANTA ROSA, CA 95407
Sonoma County (707) 565-6625
ANITA DELOS REYES SALANGA
Licensed Psychiatric Technician
2225 CHALLENGER WAY
SANTA ROSA, CA 95407
Sonoma County (707) 565-4101
GARDNER CARLSON
Licensed Psychiatric Technician
2225 CHALLENGER WAY
SANTA ROSA, CA 95407
Sonoma County (707) 565-4970
TODD HARLAND BELLINGER
Marriage & Family Therapist
2225 CHALLENGER WAY
SANTA ROSA, CA 95407
Sonoma County (707) 565-4970
IVELISE MARGARET ARGUELLO ASW
Counselor
2225 CHALLENGER WAY
SANTA ROSA, CA 95407
Sonoma County (707) 565-2862
PRABHJOT GILL
Registered Nurse (Psychiatric/Mental Health)
2225 CHALLENGER WAY
SANTA ROSA, CA 95407
Sonoma County (707) 576-8181
MEGHAN C GRIFFIN
Marriage & Family Therapist
2225 CHALLENGER WAY
SANTA ROSA, CA 95407
Sonoma County (707) 565-4970

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 Hasmig Tatiossian's NPI number?

The NPI number for Hasmig Tatiossian is 1659080695. It was assigned to this individual provider in the NPPES registry on November 18, 2022.

Where is Hasmig Tatiossian located?

Hasmig Tatiossian practices at 2225 Challenger Way, Santa Rosa, CA 95407. The listed phone number is (707) 565-6900.

What is Hasmig Tatiossian's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

Is Hasmig Tatiossian enrolled in Medicare?

Yes. Hasmig Tatiossian 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 Hasmig Tatiossian's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hasmig Tatiossian reassigns Medicare benefits to County Of Sonoma (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 Hasmig Tatiossian'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 Hasmig Tatiossian was last updated on January 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.