Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Chalmers M Hamill, MD

Internal Medicine Physician in Waterbury, CT · enumerated 2006.

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

National Provider Identifier

1578589370

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Registry record

Entity type Individual (Type 1)

Name Chalmers M Hamill

Credential MD

Sex Male

Practice address 56 Franklin St, Waterbury, CT, 06706

Phone (203) 709-6000

Fax (203) 709-3679

Enumeration date Jul 14, 2006

Last updated in NPPES Jul 15, 2014

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 022056 (CT) 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
293594	Other	CT	WELLCARE
4111885	Other	CT	AETNA
P3615781	Other	CT	OXFORD
001220565	Medicaid	CT	-
0712540	Other	CT	CONNECTICARE
01397604	Other	CT	COVENTRY/FIRST HEALTH
977587	Other	CT	USA
P00385040	Other	CT	RR MEDICARE
010022056CT05	Other	CT	ANTHEM BCBS CT

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 Chalmers Hamill's NPI record?

Cross-check NPI 1578589370 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1578589370 active?

Yes, as of the latest NPPES snapshot, NPI 1578589370 is active (record last updated 2014-07-15).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-07-15.