Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William James Marasco, MD

Diagnostic Radiology Physician in West Yarmouth, MA · enumerated 2005.

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

National Provider Identifier

1588654891

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Registry record

Entity type Individual (Type 1)

Name Dr. William James Marasco

Credential MD

Sex Male

Practice address 21 Aarons Way, West Yarmouth, MA, 02673

Phone (508) 771-5200

Enumeration date Oct 27, 2005

Last updated in NPPES Apr 7, 2014

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 71311 (MA) Primary

2085R0204X Vascular & Interventional Radiology Physician Allopathic & Osteopathic Physicians · License 71311 (MA) Secondary

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
760277	Other	MA	TUFTS HEALTH PLAN
J16021	Other	MA	BCBS MA
3135942	Medicaid	MA	-

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.

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Frequently asked questions

Where does William Marasco practice?

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

What is the NPI number for William Marasco?

The National Provider Identifier (NPI) for William Marasco is 1588654891, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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William J Marasco MD PC Diagnostic Radiology Physician · Yarmouth, MA NPI 1225078926 Bk Primary Care Pllc Primary Care Clinic/Center · West Yarmouth, MA NPI 1114740933

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-04-07.