Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexandra L Messerli, MD

Geriatric Medicine (Internal Medicine) Physician in Williston, VT · enumerated 2013.

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

National Provider Identifier

1992142939

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Registry record

Entity type Individual (Type 1)

Name Alexandra L Messerli

Credential MD

Sex Female

Practice address 353 Blair Park Rd, Williston, VT, 05495

Phone (802) 847-1470

Fax (802) 847-7135

Enumeration date May 31, 2013

Last updated in NPPES Jul 21, 2022

Taxonomy & licenses

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 042.0013838 (VT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

Where does Alexandra Messerli practice?

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

What is the NPI number for Alexandra Messerli?

The National Provider Identifier (NPI) for Alexandra Messerli is 1992142939, 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 2022-07-21.