Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. James J. Castner, M.D.

Ophthalmology Physician in Bloomfield, CT · enumerated 2005.

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

National Provider Identifier

1124026604

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Registry record

Entity type Individual (Type 1)

Name Dr. James J. Castner

Credential M.D.

Sex Male

Practice address 4 Northwestern Dr, Bloomfield, CT, 06002

Phone (860) 243-2020

Enumeration date Jul 8, 2005

Last updated in NPPES May 27, 2008

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 018022 (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
1180223	Medicaid	CT	-
180019063	Other	-	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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify James Castner's NPI record?

Cross-check NPI 1124026604 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1124026604 active?

Yes, as of the latest NPPES snapshot, NPI 1124026604 is active (record last updated 2008-05-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-05-27.