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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.

SIOBHAN M O'NEILL M.D.
NPI 1073571915
Psychiatry & Neurology - Psychiatry in Cambridge, MA

Active since May 02, 2006
1130 MASSACHUSETTS AVE, CAMBRIDGE, MA 02138(617) 724-6300 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Siobhan M O'neill M.d. NPPES

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

SIOBHAN M O'NEILL M.D. (NPI 1073571915) is an individual psychiatry provider in Cambridge, Massachusetts, licensed in Massachusetts (158509) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1073571915
Entity TypeIndividualFemale
Primary Taxonomy2084P0800X
Provider Legal NameSIOBHAN M O'NEILLCredential: M.D.
Location Address1130 MASSACHUSETTS AVECambridge, MA 02138-5204
Mailing Address1130 Massachusetts AveCambridge, MA 02138-5204 · (617) 724-6300
Phone(617) 724-6300
Sole ProprietorNo
Enumeration DateMay 2, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1073571915 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in MA · 158509
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
1130 MASSACHUSETTS AVE, Cambridge, MA 02138
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Other Providers at the Same Location NPPES 6

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

KARSTEN DIRK KUEPPENBENDER M.D., C.G.P.
Psychiatry & Neurology (Addiction Medicine)
1130 MASSACHUSETTS AVE, THIRD FLOOR
CAMBRIDGE, MA 02138
Middlesex County (617) 855-3966
MR. NEAL ANTHONY HOWARD MSW, LICSW
Social Worker (Clinical)
1130 MASSACHUSETTS AVE, 3RD FLOOR
CAMBRIDGE, MA 02138
Middlesex County (978) 606-9429
DR. MARGARET KOEPKE FOX PH.D.
Psychologist (Health Service)
1130 MASSACHUSETTS AVE, THIRD FLOOR
CAMBRIDGE, MA 02138
Middlesex County (617) 631-5411
DR. CATHERINE A FULLERTON MD
Psychiatry & Neurology (Psychiatry)
1130 MASSACHUSETTS AVE, THIRD FLOOR
CAMBRIDGE, MA 02138
Middlesex County (617) 395-7991
ALLYSON NICHELLE LIVINGSTONE LICSW
Social Worker (Clinical)
1130 MASSACHUSETTS AVE, FLOOR 3
CAMBRIDGE, MA 02138
Middlesex County (617) 905-5009
MS. ALLISON CELIMLI ADTR, LMHC
Counselor (Mental Health)
1130 MASSACHUSETTS AVE, #3
CAMBRIDGE, MA 02138
Middlesex County (617) 308-6854

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 Siobhan O'neill's NPI number?

The NPI number for Siobhan O'neill is 1073571915. It was assigned to this individual provider in the NPPES registry on May 2, 2006.

Where is Siobhan O'neill located?

Siobhan O'neill practices at 1130 Massachusetts Ave, Cambridge, MA 02138. The listed phone number is (617) 724-6300.

What is Siobhan O'neill's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

When was this NPI record last updated?

The NPPES record for Siobhan O'neill was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 25 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.