Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark S Lewis, M.D.

Anesthesiology Physician in Boston, MA · enumerated 2005.

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

National Provider Identifier

1942282280

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark S Lewis

Credential M.D.

Sex Male

Practice address 800 Washington St, #298, Boston, MA, 02111

Phone (617) 636-5000

Fax (617) 636-1465

Enumeration date Nov 14, 2005

Last updated in NPPES Apr 27, 2017

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License 55261 (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
613824	Other	MA	HARVARD PILGRIM HEALTHCAR
3050297	Medicaid	MA	-
82971	Other	MA	AETNA US HEALTHCARE
5586023	Other	MA	AETNA
055261	Other	MA	TUFTS HEALTHPLAN
2000005	Other	MA	UNITED HEALTHCARE
J05103LE	Other	MA	BLUE CROSS/SHIELD 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

How do I verify Mark Lewis's NPI record?

Cross-check NPI 1942282280 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1942282280 active?

Yes, as of the latest NPPES snapshot, NPI 1942282280 is active (record last updated 2017-04-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-04-27.