Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Joseph Martin Litwak, MD

Hospitalist Physician in Oak Bluffs, MA · enumerated 2006.

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

National Provider Identifier

1396792958

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Registry record

Entity type Individual (Type 1)

Name Dr. Joseph Martin Litwak

Credential MD

Sex Male

Practice address 1 Hospital Rd, Oak Bluffs, MA, 02557

Phone (603) 502-4144

Fax (413) 200-3251

Enumeration date May 28, 2006

Last updated in NPPES Nov 23, 2020

Taxonomy & licenses

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 9700642 (NC) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 14515 (NH) 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
30208808	Medicaid	NH	-
891118N	Medicaid	NC	-

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

How do I verify Joseph Litwak's NPI record?

Cross-check NPI 1396792958 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1396792958 active?

Yes, as of the latest NPPES snapshot, NPI 1396792958 is active (record last updated 2020-11-23).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-11-23.