Isabelle Vonalthen-Dagum, M.D.
NPI 1598789760 · Gastroenterology Physician · East Setauket, NY
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Isabelle Vonalthen-Dagum, M.D. is a Gastroenterology Physician provider in East Setauket, NY (NPI 1598789760).
Provider details
- NPI number
- 1598789760
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 231934 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
666 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 117 | $150 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 90 | $197 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 89 | $106 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 77 | $109 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 54 | $57 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 125 | 56 |
| Pantoprazole Sodium | 40 | 21 |
| Famotidine | 29 | 15 |
| Linaclotidebrand: Linzess | 29 | 12 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 23 | 21 |
| Sucralfate | 22 | — |
| Rabeprazole Sodium | 15 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$288 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-27
- Last updated
- 2008-02-29
Frequently asked questions
- What is Isabelle Vonalthen-Dagum's NPI number?
- Isabelle Vonalthen-Dagum's National Provider Identifier (NPI) is 1598789760, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Isabelle Vonalthen-Dagum's specialty?
- Isabelle Vonalthen-Dagum is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Isabelle Vonalthen-Dagum located?
- Isabelle Vonalthen-Dagum's practice location on file with NPPES is 3 Technology Dr, East Setauket, NY 11733-4064.
- What is Isabelle Vonalthen-Dagum's phone number?
- The practice phone number listed in the NPPES registry for Isabelle Vonalthen-Dagum is (631) 444-5220.
- Does Isabelle Vonalthen-Dagum accept Medicare?
- Isabelle Vonalthen-Dagum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Isabelle Vonalthen-Dagum's NPI active?
- Yes — Isabelle Vonalthen-Dagum's NPI (1598789760) is active in the NPPES registry as of the last update on 2008-02-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.