Individual Healthcare Provider
Richard Joseph Chadwin, MD
Provider's NPPES record last updated: May 22, 2018
Overview
- Entity Type
- Individual Healthcare Provider
- NPI
- 1811949399
- Primary Specialty
- Psychiatry & Neurology — Neurodevelopmental Disabilities
- Practice Location
- Sonoma, California
- Sole Proprietor
- No
Federal Screening
NPISignal checked this NPI against federal exclusion sources. Results below are based on the NPI number itself — an identifier match, not a name match.
List of Excluded Individuals/Entities (LEIE)
HHS Office of Inspector General
No potential match was identified in NPISignal's indexed List of Excluded Individuals/Entities (LEIE) records as of 2026-09-10.
- Source data
- September 10, 2026
- Records indexed
- 84,001
- Screened
- Sep 18, 2026, 11:07 AM UTC
This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.
SAM.gov Exclusions
U.S. General Services Administration
SAM.gov Exclusions was not checked.
SAM.gov screening is not configured on this deployment. No SAM check has been performed.
- Screened
- Not checked
This is an NPI-based check only. NPISignal does not publish name-based exclusion matches on a provider profile. A shared or similar name is a lead that requires human review, not an identification, and this page is not the place to make one. Run a name-based screening below to see potential matches with the reasons for each.
This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.
Searches OIG LEIE and SAM.gov by name and reviews every potential match.
Specialties & Taxonomies
- Primary
Psychiatry & Neurology
Neurodevelopmental Disabilities
Allopathic & Osteopathic Physicians
A neurologist who specializes in the treatment of individuals with developmental delays and learning disorders associated with cerebral palsy, spina bifida, autism, and other chronic neurologic conditions.
Taxonomy code 2084P0005X Psychiatry & Neurology
Psychiatry
Allopathic & Osteopathic Physicians
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.
Taxonomy code 2084P0800X
Provider-Reported License Information
- Psychiatry & Neurology (California)
- G27274
- Psychiatry & Neurology (California)
- G27274
Practice Locations
Practice Location
690 Hudson Ct
Sonoma, California 95476
Phone: (707) 849-6533
Record Information
- Enumeration Date
- May 16, 2006
- Provider's NPPES Record Last Updated
- May 22, 2018
- NPISignal NPPES Dataset
- August 2026
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