Registry data as of Aug 27, 2026

1st Class Sleep Diagnostics

1st Class Sleep Diagnostics holds 7 active organization NPIs in the federal registry, with practice locations in 6 Virginia cities. All list clinical medical laboratory as their primary taxonomy; each location can bill under its own NPI.

CMS NPPES registry, file of Aug 9, 2026 · legal names grouped after punctuation and "LLC" are removed · method · Verify with CMS →

Which NPI is yours?

Search the organization with your city to find the NPI for the location you visit or bill.

Find a location's NPI

Leesburg has the most NPIs, 2

  1. Leesburg2
  2. Fairfax1
  3. Gainesville1
  4. Herndon1
  5. Springfield1
  6. Vienna1

Source: CMS NPPES monthly file of Aug 9, 2026, organization NPIs by practice city.

Most NPIs were issued in 2012 and 2013

1st Class Sleep Diagnostics NPIs by year issued2012: 6, 2013: 102462012201361
1st Class Sleep Diagnostics NPIs by year issued2012: 6, 2013: 102462012201361
1st Class Sleep Diagnostics NPIs by year issued2012: 6, 2013: 102462012201361

Source: CMS NPPES, enumeration dates.

6 NPIs were issued in 2012 alone, more than in any other year.

Leesburg locations

The city with the most 1st Class Sleep Diagnostics NPIs. The full list of all 7 follows.

NPILocationPrimary taxonomyIssued
150810071019420 GOLF VISTA PLZ SUITE 110, LeesburgClinical Medical LaboratoryNov 15, 2012
141729162619420 GOLF VISTA PLZ SUITE 350, LeesburgClinical Medical LaboratoryNov 15, 2012
All 7 locations, by city
NPILocationPrimary taxonomyIssued
11647665723911 OLD LEE HWY SUITE 42-B, FairfaxClinical Medical LaboratoryNov 26, 2012
18819380907915 LAKE MANASSAS DR SUITE 305, GainesvilleClinical Medical LaboratoryNov 15, 2012
19021456261037 STERLING RD STE 102, HerndonClinical Medical LaboratoryFeb 1, 2013
150810071019420 GOLF VISTA PLZ SUITE 110, LeesburgClinical Medical LaboratoryNov 15, 2012
141729162619420 GOLF VISTA PLZ SUITE 350, LeesburgClinical Medical LaboratoryNov 15, 2012
11445643526128 BRANDON AVE SUITE 208, SpringfieldClinical Medical LaboratoryNov 15, 2012
13263825322559 CHAIN BRIDGE RD, ViennaClinical Medical LaboratoryNov 15, 2012

Checking an organization

  1. Match the NPI to the exact location you will visit or bill; each location can have its own.
  2. Confirm the business entity with the secretary of state.
  3. Check the HHS-OIG exclusion list for the organization and its owners.
  4. Verify each clinician you will see on their own record and with the state license search.

Common questions

Why does 1st Class Sleep Diagnostics have 7 NPIs?

An organization may obtain more than one Type 2 NPI, for example for separate locations or units that bill on their own. 1st Class Sleep Diagnostics's NPIs list practice locations in 6 cities.

Is an organization NPI a license?

No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.

Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.