Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William W Macomber, MD

Internal Medicine Physician in Marblehead, MA · enumerated 2006.

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

National Provider Identifier

1033165717

Verified

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Registry record

Entity type Individual (Type 1)

Name William W Macomber

Credential MD

Sex Male

Practice address 1 Widger Rd, Ste 204, Marblehead, MA, 01945

Phone (781) 631-2577

Fax (781) 631-5405

Enumeration date May 25, 2006

Last updated in NPPES Aug 11, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 45330 (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
0116645	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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Macomber practice?

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

What is the NPI number for William Macomber?

The National Provider Identifier (NPI) for William Macomber is 1033165717, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-08-11.