Alexandra L. Messerli, MD
Geriatric Medicine (Internal Medicine) Physician · Williston, VT
Alexandra L. Messerli, MD is a geriatric medicine (internal medicine) physician with a practice address in Williston, Vermont, and NPI 1992142939, issued on May 31, 2013. Check the license (Vermont 042.0013838, as entered in NPPES) on the Vermont Board of Medical Practice; the Medicare figures below come from public CMS files.
- Name
- Alexandra L. Messerli
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 042.0013838 VT
Self-reported in NPPES; status is on the state search - Practice location
- 353 Blair Park RD, Williston, VT 05495
- Phone
- (802) 847-1470
- Enumerated
- May 31, 2013
- Record last updated
- Jul 21, 2022
- Fax
- (802) 847-7135
- Medicare enrollment
- Enrolled (PECOS I20180129000515); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 2013
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 16 in Vermont → Look up another NPI →
Also registered at 353 Blair Park RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kirsten Berggren, FNPNurse Practitioner1841580859
- Anne Brena, MDInternal Medicine Physician1790870723
- Martha Churchill, CNMAdvanced Practice Midwife1285741157
- Karyn Farevaag, NPNurse Practitioner1215364062
- Tracy FornasierGerontology Registered Nurse1790645604
- Karen GibbsNurse Practitioner1215550116
Verify Alexandra L. Messerli in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVermont Board of Medical Practice
Search for license 042.0013838Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
30% more Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
5,512 Medicare Part D claims for 474 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 130 claims were for opioids.
Most prescribed
- Atorvastatin Calcium327 claims
- Amlodipine Besylate210 claims
- Levothyroxine Sodium197 claims
- Eliquis183 claims
- Gabapentin157 claims
- Sertraline Hcl150 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- University OF Vermont Medical Center IncBurlington, VT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexandra L. Messerli among 16 geriatric medicine (internal medicine) physician records in Vermont
Alexandra L. Messerli, MD is one of 16 geriatric medicine (internal medicine) physician records with a practice address in Vermont. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 75% of them.
- NPI issued2013 · 75% of these records are older, 13% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Record last updated2022 · 75% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Vermont practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Vermont
There are 16 geriatric medicine (internal medicine) physician records in Vermont.
All 16 in Vermont → Every provider in Williston → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Owen Maguire, MDWilliston, VT 054951477176097
- Dorothy Fisher, MDEssex Jct, VT 054521376639021
- Michael Lamantia, M.D.Colchester, VT 054461801005632
- Zail Berry, M.D., M.P.H.Burlington, VT 054011427158989
- Amelia Gennari, MDBurlington, VT 054011851364848
- Robert Karp, MDBurlington, VT 054011780608588
- Henry Southall, M.D.Morrisville, VT 056611770674137
- Walter Griffiths, M.D.Brattleboro, VT 053011962432880
Common questions
What is Alexandra L. Messerli, MD's NPI number?
Alexandra L. Messerli, MD's National Provider Identifier (NPI) is 1992142939, issued on May 31, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Alexandra L. Messerli, MD located?
The NPPES record lists a practice address at 353 Blair Park RD, Williston, VT, 05495. Phone: (802) 847-1470. Providers update this record themselves, so call before visiting.
How can I verify Alexandra L. Messerli, MD's license?
NPPES lists Vermont license number 042.0013838, as entered by the provider. Search the Vermont Board of Medical Practice at https://www.healthvermont.gov/systems/board-medical-practice. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alexandra L. Messerli, MD prescribe under Medicare Part D?
In 2024, Alexandra L. Messerli, MD had 5,512 Medicare Part D claims for 474 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.