Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Stephen Maher, M.D.

Internal Medicine Physician in Newton Lower Falls, MA · enumerated 2006.

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

National Provider Identifier

1194835637

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Registry record

Entity type Individual (Type 1)

Name William Stephen Maher

Credential M.D.

Sex Male

Practice address 2000 Washington St, Suite 546, Newton Lower Falls, MA, 02462

Phone (617) 964-5020

Fax (617) 964-3033

Enumeration date Aug 30, 2006

Last updated in NPPES May 14, 2008

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 78946 (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
3198600	Medicaid	MA	-
400623	Other	MA	TUFTS HEALTH PLAN
0407539	Other	MA	UNITED HEALTHCARE
6000021	Other	MA	HARVARD PILGRIM HEALTHCAR
J21520	Other	MA	BLUE SHIELD
1013478004	Other	MA	CIGNA HEALTHCARE
P00079305	Other	MA	RAILROAD MEDICARE

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

Is NPI 1194835637 active?

Yes, as of the latest NPPES snapshot, NPI 1194835637 is active (record last updated 2008-05-14).

How do I verify William Maher's NPI record?

Cross-check NPI 1194835637 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-05-14.