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ROBERT S MCWILLIAM MD LLC
NPI 1215486261
Psychiatry & Neurology - Psychiatry in Woodbury, CT

Active since September 30, 2016
4 S POMPERAUG AVE, WOODBURY, CT 06798(203) 266-0404(203) 263-0511 Get Directions Write a Review

NPPES record last updated: September 30, 2016. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Robert S Mcwilliam Md Llc NPPES

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

ROBERT S MCWILLIAM MD LLC (NPI 1215486261) is a healthcare organization registered as a psychiatry in Woodbury, Connecticut and active in the NPI registry since September 2016. The organization lists Robert S Mcwilliam, Owner, as its authorized official.

NPPES Registry Identity

NPI1215486261
Entity TypeOrganization
Primary Taxonomy2084P0800X
Legal Business NameROBERT S MCWILLIAM MD LLC
Location Address4 S POMPERAUG AVEWoodbury, CT 06798-3709
Mailing Address4 S Pomperaug AveWoodbury, CT 06798-3709 · (203) 266-0404 · Fax (203) 263-0511
Phone(203) 266-0404
Fax(203) 263-0511
Organization SubpartNo
Authorized OfficialRobert S McwilliamOwner · (203) 266-0404
Enumeration DateSeptember 30, 2016
✔ NPI 1215486261 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 CT · 022885
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.
4 S POMPERAUG AVE, Woodbury, CT 06798
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Other Identifiers 2

Medicare UPIN260000841CT
Medicaid001228857CT

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Robert S Mcwilliam Md Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Robert S Mcwilliam MD LLC, which bills Medicare for the services this clinician delivers.

Clinician (1)

Robert Mcwilliam, MD
Psychiatry
NPI 1619071602
4 S POMPERAUG AVE
Woodbury, CT 06798
(203) 266-0404
✔ PECOS✔ Accepts Medicare0.1 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Robert S Mcwilliam MD LLC's NPI number?

The NPI number for Robert S Mcwilliam MD LLC is 1215486261. It was assigned to this organization in the NPPES registry on September 30, 2016.

Where is Robert S Mcwilliam MD LLC located?

Robert S Mcwilliam MD LLC is located at 4 S Pomperaug Ave, Woodbury, CT 06798. The listed phone number is (203) 266-0404.

What is Robert S Mcwilliam MD LLC's specialty?

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

Is Robert S Mcwilliam MD LLC enrolled in Medicare?

Yes. Robert S Mcwilliam MD LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Robert S Mcwilliam MD LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Psychiatry) reassigns their Medicare billing to Robert S Mcwilliam MD LLC. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Robert S Mcwilliam MD LLC was last updated on September 30, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.