Ivan Lowenthal, M.D.
NPI 1043245889 · Medical Oncology Physician · Tamuning, GU
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ivan Lowenthal, M.D. is a Medical Oncology Physician provider in Tamuning, GU (NPI 1043245889).
Provider details
- NPI number
- 1043245889
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 18789 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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.
Practice location
Mailing address
Additional practice locations (2)
- 6 Devine St Ste 2cNorth Haven, CT 06473-2222Phone: (203) 407-8002
- 385 Huron AveCambridge, MA 02138-6820Phone: (860) 307-3393
Registry dates
- Enumerated
- 2006-07-11
- Last updated
- 2025-03-19
- Certified
- 2025-03-17
Frequently asked questions
- What is Ivan Lowenthal's NPI number?
- Ivan Lowenthal's National Provider Identifier (NPI) is 1043245889, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ivan Lowenthal's specialty?
- Ivan Lowenthal is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ivan Lowenthal located?
- Ivan Lowenthal's practice location on file with NPPES is 633 Gov Carlos Camacho Rd., Ste B5, Tamuning, GU 96913-3194.
- What is Ivan Lowenthal's phone number?
- The practice phone number listed in the NPPES registry for Ivan Lowenthal is (671) 647-4656.
- Does Ivan Lowenthal accept Medicare?
- Ivan Lowenthal is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ivan Lowenthal's NPI active?
- Yes — Ivan Lowenthal's NPI (1043245889) is active in the NPPES registry as of the last update on 2025-03-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.