1st Class Sleep Diagnostics, Inc

1st Class Sleep Diagnostics, Inc is a healthcare organization registered as Clinical Medical Laboratory in Fairfax, VA, holding Type 2 (organization) NPI 1164766572 since 2012. The authorized official on file is Young Yi, Founder.

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NPI	1164766572
Entity type	Organization (Type 2)
Legal business name	1st Class Sleep Diagnostics, Inc
Practice address	3911 OLD LEE HWY, SUITE 42-B, Fairfax, VA, 22030
Phone	7033859222
Fax	7033732671
Enumeration date	2012-11-26
Last updated in NPPES	2012-11-26

Authorized official

Name	Young Yi
Title	Founder
Phone	7033859222

Taxonomy & classification

Taxonomy code	Specialty	Primary	License	State
291U00000X	Clinical Medical Laboratory	Primary	107828	VA

Copy-ready billing details

Provider: 1st Class Sleep Diagnostics, Inc
NPI: 1164766572
Taxonomy: 291U00000X (Clinical Medical Laboratory)
Address: 3911 OLD LEE HWY, SUITE 42-B, Fairfax, VA, 22030

Providers at this address

NPI	Name	Type	Specialty	Location
1609968874	Lida Vargas	Individual	Dentist	Fairfax, VA
1366502429	Daniele Nunez	Individual	Family Medicine Physician	Fairfax, VA
1598825655	Eric Vallone	Individual	Internal Medicine Physician	Fairfax, VA
1457662660	Margaret Rockwood	Individual	Family Medicine Physician	Fairfax, VA
1639542160	Loudoun Medical Group, PC	Organization	Family Medicine Physician	Fairfax, VA

Verify this record

Cross-check NPI 1164766572 against the authoritative CMS record: view 1st Class Sleep Diagnostics, Inc on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

Where is 1st Class Sleep Diagnostics, Inc located?

The practice location on file with NPPES is in Fairfax, VA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2012-11-26. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2012-11-26.