Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Leonid Karkanitsa, MD

Internal Medicine Physician in Stratford, CT · enumerated 2006.

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

National Provider Identifier

1669435087

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Registry record

Entity type Individual (Type 1)

Name Leonid Karkanitsa

Credential MD

Sex Male

Practice address 6580 Main St Fl 1, Stratford, CT, 06614

Phone (203) 377-5444

Fax (203) 377-5540

Enumeration date Apr 7, 2006

Last updated in NPPES Jul 24, 2018

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 043534 (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
004256302	Medicaid	CT	-
D300080683	Other	CT	MEDICARE
C03462	Other	CT	MEDICARE PTAN

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

Where does Leonid Karkanitsa practice?

The practice location on file with NPPES is in Stratford, CT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Leonid Karkanitsa?

The National Provider Identifier (NPI) for Leonid Karkanitsa is 1669435087, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-07-24.