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

Dr. William Slaughter, MD

Psychiatry Physician in Cambridge, MA · enumerated 2006.

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

National Provider Identifier

1811935042

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Registry record

Entity type Individual (Type 1)

Name Dr. William Slaughter

Credential MD

Sex Male

Practice address Cambridge, MA, 02139

Phone (617) 233-8957

Enumeration date Jun 2, 2006

Last updated in NPPES Mar 25, 2010

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

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 220004 (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
1086950	Other	MA	BEACON HEALTH
1811935042	Other	MA	UNITED BEHAVIORAL HEALTH
495436	Other	MA	TUFTS HEALTH PLAN
1811935042	Other	MA	PACIFICARE
33235	Other	MA	CIGNA
J40610	Other	MA	BLUE CROSS
2128586	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

What is the NPI number for William Slaughter?

The National Provider Identifier (NPI) for William Slaughter is 1811935042, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Slaughter practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-03-25.