Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Davenport Powlis, M.D.

Radiation Oncology Physician in South Weymouth, MA · enumerated 2006.

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

National Provider Identifier

1083656771

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Registry record

Entity type Individual (Type 1)

Name William Davenport Powlis

Credential M.D.

Sex Male

Practice address 101 Columbian St, Radiation Oncology, South Weymouth, MA, 02190

Phone (781) 624-4700

Fax (781) 624-4710

Enumeration date Jun 10, 2006

Last updated in NPPES Aug 24, 2015

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License MD027906E (PA) Secondary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 38122 (MA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
0011060870002	Medicaid	TN	-
487351	Other	PA	HIGHMARK BCBS

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

Where does William Powlis practice?

The practice location on file with NPPES is in South Weymouth, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Powlis?

The National Provider Identifier (NPI) for William Powlis is 1083656771, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Suniti Nimbkar Surgery Physician · South Weymouth, MA NPI 1144290800 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 Jennifer Byer Medical Oncology Physician · Weymouth, MA NPI 1336438522

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-08-24.