Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Nicolas Athanassiou, M.D.

Anesthesiology Physician in Houston, TX · enumerated 2006.

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

National Provider Identifier

1750449831

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Registry record

Entity type Individual (Type 1)

Name Dr. Nicolas Athanassiou

Credential M.D.

Sex Male

Practice address 6565 Fannin St Ste B452, Houston, TX, 77030

Phone (713) 441-3620

Fax (713) 790-2082

Enumeration date Dec 4, 2006

Last updated in NPPES Jul 14, 2026

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License L3914 (TX) 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
P00246625	Other	TX	RAILROAD MEDICARE
147621003	Medicaid	TX	-
2315269	Medicaid	LA	-

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 Nicolas Athanassiou practice?

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

What is the NPI number for Nicolas Athanassiou?

The National Provider Identifier (NPI) for Nicolas Athanassiou is 1750449831, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-14.