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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

SHANNON O'BRIEN LCSW
NPI 1962088062
Student in an Organized Health Care Education/Training Program in Vacaville, CA

Active since March 20, 2021PECOS Enrolled
1600 CALIFORNIA DRIVE, VACAVILLE, CA 95696(707) 448-6841 Get Directions Write a Review

NPPES record last updated: October 8, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Oct 8, 2026, Sep 21, 2026, Apr 30, 2026 and 3 more (6 updates tracked since 2021).

About Shannon O'brien Lcsw NPPES

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

SHANNON O'BRIEN LCSW (NPI 1962088062) is an individual student in an organized health care education/training program in Vacaville, California and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS and maintains a secondary practice location in Lancaster.

NPPES Registry Identity

NPI1962088062
Entity TypeIndividualFemale
Primary Taxonomy390200000X
Provider Legal NameSHANNON O'BRIENCredential: LCSW
Location Address1600 CALIFORNIA DRIVEVacaville, CA 95696-2237
Mailing Address626 W Lancaster Blvd Unit 128Lancaster, CA 93534-3108 · (661) 434-5997
Phone(707) 448-6841
Sole ProprietorYes
Enumeration DateMarch 20, 2021
Last NPPES UpdateOctober 8, 20266 updates tracked since enumeration
NPPES CertifiedOctober 8, 2026
✔ NPI 1962088062 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyStudent in an Organized Health Care Education/Training ProgramStudent, Health Care
Taxonomy Code390200000X
Definition
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
Also ListedSocial Worker · ClinicalTaxonomy 1041C0700X · License 89763 (CA), 0904014443 (VA), 102476 (NY), 44SC06383300 (NJ)
1600 CALIFORNIA DRIVE, Vacaville, CA 95696
Open in Google Maps ↗

Secondary Practice Location 1

Location 1626 W Lancaster Blvd Unit 128Lancaster, CA 93534-3108 · Phone (661) 434-5997

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cigna Healthcare, Cigna HealthCare of Florida, Inc., Oscar Health and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Shannon O'brien Lcsw 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 Shannon O'brien reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Sud Specialty Group - Ca
64 mi
Addiction Medicine
4633 OLD IRONSIDES DR STE 304
Santa Clara, CA 95054
  • Reassigned Medicare billing, California enrollment
  • 1,607 clinicians in this Medicare group
NPI 1972138238 (323) 205-7088

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.

MR. JOHN JAMES BARCLAY RPH
Pharmacist
1600 CALIFORNIA DRIVE
VACAVILLE, CA 95696
Solano County (707) 449-6595
MR. STIRLING C PRICE SOCIAL WORKER
Social Worker (Clinical)
1600 CALIFORNIA DRIVE
VACAVILLE, CA 95696
Solano County (707) 449-6504
DR. JOYCE W CORDOSI PSY.D.
Psychologist (Clinical)
1600 CALIFORNIA DRIVE
VACAVILLE, CA 95696
Solano County (707) 448-6841
TARA RENEE TANAKA PH.D.
Psychologist (Clinical)
1600 CALIFORNIA DRIVE
VACAVILLE, CA 95696
Solano County (707) 430-1165
MS. EILEEN JOY E ESPORO MSW, LCSW
Social Worker (Clinical)
1600 CALIFORNIA DRIVE
VACAVILLE, CA 95696
Solano County (707) 448-6841
MOLLY BRIDGET MALONE
Psychologist (Clinical)
1600 CALIFORNIA DRIVE
VACAVILLE, CA 95696
Solano County (707) 448-6841
DR. JOHN FANNIN LECKIE PH.D
Psychologist (Counseling)
1600 CALIFORNIA DRIVE
VACAVILLE, CA 95696
Solano County (707) 448-6841
MRS. ASHA MAHENDRA GANDHI M.D.
Psychiatry & Neurology (Forensic Psychiatry)
1600 CALIFORNIA DRIVE, DEPT. OF MENTAL HEALTH, DEPT. OF CORRECTIONS
VACAVILLE, CA 95696
Solano County (707) 449-6589

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 Shannon O'brien's NPI number?

The NPI number for Shannon O'brien is 1962088062. It was assigned to this individual provider in the NPPES registry on March 20, 2021.

Where is Shannon O'brien located?

Shannon O'brien practices at 1600 California Drive, Vacaville, CA 95696. The listed phone number is (707) 448-6841.

What is Shannon O'brien's specialty?

The primary specialty registered for this NPI is Student in an Organized Health Care Education/Training Program with taxonomy code 390200000X.

Is Shannon O'brien enrolled in Medicare?

Yes. Shannon O'brien is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Shannon O'brien's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Shannon O'brien reassigns Medicare benefits to Sud Specialty Group - Ca (Santa Clara, 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 Shannon O'brien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Shannon O'brien accept?

Health plans from Cigna HealthCare of Florida, Inc., Cigna Healthcare, Oscar Health and UnitedHealthcare list Shannon O'brien as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Shannon O'brien was last updated on October 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 29 days 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.