Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Kathleen Michelle Leahy, M.D., MPH

Medical Oncology Physician in Weymouth, MA · enumerated 2015.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1275913014

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Registry record

Entity type Individual (Type 1)

Name Kathleen Michelle Leahy

Credential M.D., MPH

Sex Female

Practice address Weymouth, MA, 02190

Phone (781) 624-5000

Fax (781) 624-4840

Enumeration date Jun 7, 2015

Last updated in NPPES May 20, 2026

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RH0000X Hematology (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 288208 (MA) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 288208 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Kathleen Leahy?

Kathleen Leahy is registered in NPPES with the primary taxonomy of Medical Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Suniti Nimbkar Surgery Physician · South Weymouth, MA NPI 1144290800 William Powlis Radiation Oncology Physician · South Weymouth, MA NPI 1083656771 Anne Roberge Hematology & Oncology Physician · Weymouth, MA NPI 1639115041 Lynda Clancy Obstetrics & Gynecology Nurse Practitioner · Weymouth, MA NPI 1245261759 Rosemary Joyce Obstetrics & Gynecology Nurse Practitioner · Weymouth, MA NPI 1427089721 Reve Shields Hematology & Oncology Physician · South Weymouth, MA NPI 1871719187 Shail Maingi Hematology & Oncology Physician · South Weymouth, MA NPI 1114183795 Harbor Medical Associates, Inc. Diagnostic Radiology Physician · S. Weymouth, MA NPI 1689909723

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-20.