Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Sound Sleep LLC

Sleep Medicine (Internal Medicine) Physician in Haymarket, VA · enumerated 2020 · authorized official Sharmili Mathur, Owner.

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

National Provider Identifier

1639776347

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Registry record

Entity type Organization (Type 2)

Legal business name Sound Sleep LLC

Practice address 6626 Muir Dr, Haymarket, VA, 20169

Phone (301) 873-8379

Enumeration date Oct 6, 2020

Last updated in NPPES Oct 6, 2020

Taxonomy & classification

207RS0012X Sleep Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Sharmili Mathur

Title Owner

Phone (301) 873-8379

Other identifiers

Identifier	Type	State	Issuer
0102202672	Other	VA	LICENSE

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 current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2020-10-06. Verify at npiregistry.cms.hhs.gov.

Where is Sound Sleep LLC located?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-06.