Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gilbert Raymond Irwin, M.D.P.C.

Internal Medicine Physician in Manassas, VA · enumerated 2005 · practices at Thomas C. Dotson, M.D.P.C..

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

National Provider Identifier

1588649990

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Registry record

Entity type Individual (Type 1)

Name Dr. Gilbert Raymond Irwin

Credential M.D.P.C.

Sex Male

Practice address 9590 Surveyor Ct, Manassas, VA, 20110

Phone (703) 361-5116

Fax (703) 361-5876

Enumeration date Dec 8, 2005

Last updated in NPPES Dec 8, 2016

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 0101023931 (VA) Primary

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License 0101023931 (VA) Secondary

Other identifiers

Identifier	Type	State	Issuer
6052975	Medicaid	VA	-
1588649990	Medicaid	VA	-

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

What is the NPI number for Gilbert Irwin?

The National Provider Identifier (NPI) for Gilbert Irwin is 1588649990, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gilbert Irwin practice?

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

Other providers at this practice address

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Thomas C. Dotson, M.D.P.C. Internal Medicine Physician · Manassas, VA NPI 1235313479

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-12-08.