Alexandra Messerli, MD
NPI 1992142939 · Geriatric Medicine (Internal Medicine) Physician · Williston, VT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexandra Messerli, MD is a Geriatric Medicine (Internal Medicine) Physician provider in Williston, VT (NPI 1992142939).
Provider details
- NPI number
- 1992142939
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 042.0013838 (VT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
769 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 154 | $93 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 135 | $103 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 93 | $125 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 91 | $16 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 55 | $138 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 111 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 327 | 91 |
| Amlodipine Besylate | 210 | 55 |
| Levothyroxine Sodium | 197 | 45 |
| Apixabanbrand: Eliquis | 183 | 55 |
| Gabapentin | 157 | 48 |
| Sertraline Hcl | 150 | 28 |
| Omeprazole |
Practice location
Mailing address
Additional practice locations (2)
- 111 Colchester AveUvm Medical Center - Hospitalist ServiceBurlington, VT 05401Phone: (802) 847-7911Fax: (802) 847-5784
- 792 College Pkwy Ste 205Colchester, VT 05446-3052Phone: (802) 847-1111Fax: (802) 847-7594
Registry dates
- Enumerated
- 2013-05-31
- Last updated
- 2022-07-21
Frequently asked questions
- What is Alexandra Messerli's NPI number?
- Alexandra Messerli's National Provider Identifier (NPI) is 1992142939, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexandra Messerli's specialty?
- Alexandra Messerli is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Alexandra Messerli located?
- Alexandra Messerli's practice location on file with NPPES is 353 Blair Park Rd, Williston, VT 05495-7530.
- What is Alexandra Messerli's phone number?
- The practice phone number listed in the NPPES registry for Alexandra Messerli is (802) 847-1470.
- Does Alexandra Messerli accept Medicare?
- Alexandra Messerli is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexandra Messerli's NPI active?
- Yes — Alexandra Messerli's NPI (1992142939) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.