Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William David Carroll, M.D.

Internal Medicine Physician in Santa Rosa, CA · enumerated 2005.

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

National Provider Identifier

1922005891

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Registry record

Entity type Individual (Type 1)

Name William David Carroll

Credential M.D.

Sex Male

Practice address 3536 Mendocino Ave, 300, Santa Rosa, CA, 95403

Phone (707) 546-2180

Fax (707) 546-2188

Enumeration date Jul 6, 2005

Last updated in NPPES Feb 7, 2012

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A39947 (CA) Primary

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A39947 (CA) Secondary

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
00A399470	Other	CA	BLUE SHIELD OF CALIFORNIA
00A399470	Medicaid	CA	-
110105821	Other	CA	RAILROAD MEDICARE

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.

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Frequently asked questions

Where does William Carroll practice?

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

What is the NPI number for William Carroll?

The National Provider Identifier (NPI) for William Carroll is 1922005891, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-02-07.