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MARY ANN KASSIER LCSW
NPI 1285850990
Social Worker - Clinical in Walnut Creek, CA

Active since April 18, 2007Opted out of Medicare · through Jul 1, 2027
1849 BONANZA ST, WALNUT CREEK, CA 94596(925) 746-2624 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Mary Ann Kassier Lcsw NPPES

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

MARY ANN KASSIER LCSW (NPI 1285850990) is an individual clinical provider in Walnut Creek, California, licensed in California (LCS10164) and active in the NPI registry since April 2007. She has opted out of Medicare through July 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1285850990
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMARY ANN KASSIERCredential: LCSW
Location Address1849 BONANZA STWalnut Creek, CA 94596-4317
Mailing Address2123 Carleton StBerkeley, CA 94704-3213 · (925) 746-2624
Phone(925) 746-2624
Sole ProprietorYes
Enumeration DateApril 18, 2007
Last NPPES UpdateJuly 8, 2007
✔ NPI 1285850990 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in CA · LCS10164
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
1849 BONANZA ST, Walnut Creek, CA 94596
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Mary Ann Kassier Lcsw has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from July 1, 2013 through July 1, 2027.

Opt-Out Effective DateJuly 1, 2013
Opt-Out In Effect ThroughJuly 1, 2027Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94596 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
$0.00 typical visit price
range $69.00 – $202.35
Typical copayment $0.00 (range $17.25 – $50.58)
Most-billed visit code NA
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
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 4

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

DR. EMANUEL JACK WEISS PSYD
Psychologist
1849 BONANZA ST
WALNUT CREEK, CA 94596
Contra Costa County (925) 788-1389
DR. MICHAEL CHENEY PSY.D.
Psychologist (Clinical)
1849 BONANZA ST
WALNUT CREEK, CA 94596
Contra Costa County (925) 210-0700
CAREE LEE BROWN LCSW
Counselor (Mental Health)
1849 BONANZA ST
WALNUT CREEK, CA 94596
Contra Costa County (925) 878-5587
MRS. LAURIE RUTH LANGER LCSW
Social Worker (Clinical)
1849 BONANZA ST
WALNUT CREEK, CA 94596
Contra Costa County (925) 946-1622

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 Mary Ann Kassier's NPI number?

The NPI number for Mary Ann Kassier is 1285850990. It was assigned to this individual provider in the NPPES registry on April 18, 2007.

Where is Mary Ann Kassier located?

Mary Ann Kassier practices at 1849 Bonanza St, Walnut Creek, CA 94596. The listed phone number is (925) 746-2624.

What is Mary Ann Kassier's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Mary Ann Kassier enrolled in Medicare?

No. Mary Ann Kassier has opted out of Medicare through July 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Mary Ann Kassier was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.