Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David M. Slack, MD

Internal Medicine Physician in Easthampton, MA · enumerated 2006.

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

National Provider Identifier

1205895554

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Registry record

Entity type Individual (Type 1)

Name David M. Slack

Credential MD

Sex Male

Practice address 179 Northampton St, #H, Easthampton, MA, 01027

Phone (413) 529-9300

Fax (413) 527-9793

Enumeration date Mar 23, 2006

Last updated in NPPES Jun 17, 2008

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 72497 (MA) Primary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 72497 (MA) Secondary

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
16474	Other	MA	HEALTH NEW ENGLAND
2358373	Other	MA	AETNA
740008	Other	MA	CONNECTICARE
J09911	Other	MA	BCBSMA
000000007738	Other	MA	BOSTON MEDICAL CENTER HEALTHNET PLAN
1293916	Other	MA	FALLON
3066134	Medicaid	MA	-
1024130	Other	MA	CIGNA
63401	Other	MA	HARVARD PILGRIM
729533	Other	MA	TUFTS

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

What specialty is David Slack?

David Slack is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-17.