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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.

BRENDAN LEO ROONEY MD
NPI 1184423261
Internal Medicine in Boston, MA

Active since March 11, 2025PECOS Enrolled
800 WASHINGTON ST # 600B, BOSTON, MA 02111(617) 636-5400 Get Directions Write a Review

NPPES record last updated: October 8, 2026. Verified against the NPPES registry weekly; last sync: October 11, 2026.

Record update history: Oct 8, 2026, Mar 11, 2025 (2 updates tracked since 2025).

About Brendan Leo Rooney Md NPPES

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

BRENDAN LEO ROONEY MD (NPI 1184423261) is an individual internal medicine provider in Boston, Massachusetts, licensed in Massachusetts (3021170) and active in the NPI registry since March 2025. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1184423261
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameBRENDAN LEO ROONEYCredential: MD
Location Address800 WASHINGTON ST # 600BBoston, MA 02111-1552
Mailing Address800 Washington St # 600bBoston, MA 02111-1552 · (617) 636-5400
Phone(617) 636-5400
Sole ProprietorNo
Enumeration DateMarch 11, 2025
Last NPPES UpdateOctober 8, 20262 updates tracked since enumeration
NPPES CertifiedOctober 8, 2026
✔ NPI 1184423261 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MA · 3021170
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
800 WASHINGTON ST # 600B, Boston, MA 02111
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Brendan Leo Rooney Md 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02111 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$144.11 typical visit price
range $63.72 – $189.86
Typical copayment $36.02 (range $15.93 – $47.46)
Most-billed visit code 99204
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

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

MARGARET B MCNAMARA MD
Internal Medicine
800 WASHINGTON ST # 600B
BOSTON, MA 02111
Suffolk County (617) 636-5400
DHRUSTI PATEL MD
Internal Medicine
800 WASHINGTON ST # 600B
BOSTON, MA 02111
Suffolk County (617) 636-5400

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 Brendan Rooney's NPI number?

The NPI number for Brendan Rooney is 1184423261. It was assigned to this individual provider in the NPPES registry on March 11, 2025.

Where is Brendan Rooney located?

Brendan Rooney practices at 800 Washington St # 600B, Boston, MA 02111. The listed phone number is (617) 636-5400.

What is Brendan Rooney's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Brendan Rooney enrolled in Medicare?

Yes. Brendan Rooney is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Brendan Rooney 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 7 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.