MR. WILLIAM BRENNAN – Clinical Social Worker, NPI 1346624822

MR. WILLIAM BRENNAN is a healthcare provider. based in New britain, Connecticut. specializing in Clinical Social Worker. They hold a License No. 001219 (CT). The NPI Number for MR. WILLIAM BRENNAN is 1346624822

Main info

Male
12 Years Of Experience
Accepts Medicare Assignment
Name
MR. WILLIAM BRENNAN
NPI
1346624822
Phone
Not provided
Address
75 N MOUNTAIN RD
Enumeration Date
15 July 2015
Last Update Date
15 July 2015

Doctor Profile

Medical School Name
OTHER
Secondary Phone
2036305220
Graduation Year
2014 (12 years ago)
PAC ID
4981980851
Group Practice PAC ID
1153227756
Professional Enrollment ID
I20170406002103
Data current as of
20 May 2026

Profile Insights

NPPES metrics only — not quality of care.

Methodology
Experience34
Completeness75
Years active:10State licenses:1Digital endpointsOther names

Provider Addresses for MR. WILLIAM BRENNAN

  • 75 N MOUNTAIN RD

    NEW BRITAIN, CT 060533468

    Phone:

    Mailing address matches the actual address.

NPPES updates history

No NPPES updates recorded for this provider.

Prescription Activity

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Open Payments (CMS)

No Open Payments data available for this provider.

This can happen when there are no reportable CMS Open Payments records.

Medicare Enrollment & Revalidation

Source: CMS public data · Not endorsed by CMS ·

Educational use only—not medical, billing, or legal advice.

No Medicare enrollment or revalidation data available for this provider in our database.

Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS

Medicare Utilization (FFS)

Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·

Educational use only—not medical, billing, or legal advice.

Top Medicare procedures (2023) · refreshed 2026-05-27

HCPCSDescriptionServicesBeneficiariesMedicare allowed
90853Group psychotherapy34364$0
View full utilization report →

Insurance plans in this area (ZIP 06053)

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Group practice members

Group practice members are other physicians who share the same Group Practice PAC ID with this doctor. When doctors form a group practice and register in PECOS as a single entity, they receive a shared identification number. This table lists all providers in the same group practice.
PAC ID: 1153227756View full group profile
NameSpecialtyState
JAMES LOUGHRAN (LPC)
Mental Health CounselorCT
LADASIA SIERRA DAUGHTRY (LPC)
Mental Health CounselorCT
AMANDA L CHASE (APRN)
Nurse PractitionerCT
CAROLINE POLSKY
Nurse PractitionerCT
NICOLE K EVANKO (APRN)
Nurse PractitionerCT
MONIKA GUNNING (LCSW)
Clinical Social WorkerCT
EMILY JULIANA FRIEDMAN
-CT
AMA GYIMAH
Nurse PractitionerCT
MS. JOANN KIERNAN (PHD LPC)
Mental Health CounselorCT
MR. JOHN ALBERT III POTTER (LCSW)
-CT

Reviews

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Frequently asked questions

What is the registry number for MR. WILLIAM BRENNAN?
The registry entry for MR. WILLIAM BRENNAN shows NPI 1346624822.
Does the public listing show MR. WILLIAM BRENNAN as active?
MR. WILLIAM BRENNAN's NPI record reflects an active status in NPPES.
What does the directory say MR. WILLIAM BRENNAN does?
Insurance directories may phrase it differently, but here MR. WILLIAM BRENNAN maps to Clinical Social Worker. Clinical services aligned with this taxonomy classification.
What geographic area is tied to MR. WILLIAM BRENNAN?
MR. WILLIAM BRENNAN is associated with New Britain, Connecticut in the same public data insurers reference.
What is the difference between NPI and a medical license?
An NPI is a federal identifier; a medical license is issued by a state and governs where someone may practice.

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