1. Home
  2. Directory
  3. NPI Profile

DR. IVAN STEPHEN LOWENTHAL M.D.
NPI 1043245889
Internal Medicine - Medical Oncology in Tamuning, GU

Active since July 11, 2006PECOS Enrolled
633 GOV CARLOS CAMACHO RD., STE B5, TAMUNING, GU 96913(671) 647-4656(671) 647-4660 Get Directions Write a Review

NPPES record last updated: March 19, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Mar 19, 2025, Mar 7, 2023, Oct 29, 2018 and 1 more (4 updates tracked since 2016).

About Dr. Ivan Stephen Lowenthal M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. IVAN STEPHEN LOWENTHAL M.D. (NPI 1043245889) is an individual medical oncology provider in Tamuning, Guam, licensed in Guam (M-1925) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1043245889
Entity TypeIndividualMale
Primary Taxonomy207RX0202X
Provider Legal NameDR. IVAN STEPHEN LOWENTHALCredential: M.D.
Location Address633 GOV CARLOS CAMACHO RD., STE B5Tamuning, GU 96913-3194
Mailing Address633 Gov Carlos Camacho Rd., Ste B5Tamuning, GU 96913-3194 · (671) 647-4656 · Fax (671) 647-4660
Phone(671) 647-4656
Fax(671) 647-4660
Sole ProprietorYes
Enumeration DateJuly 11, 2006
Last NPPES UpdateMarch 19, 20254 updates tracked since enumeration
NPPES CertifiedMarch 17, 2025
✔ NPI 1043245889 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
Licenses✔ Licensed in GU · M-1925✔ Licensed in CT · 18789
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

Secondary Practice Locations 2

Location 16 Devine St Ste 2CNorth Haven, CT 06473-2222 · Phone (203) 407-8002
Location 2385 Huron AveCambridge, MA 02138-6820 · Phone (860) 307-3393

Other Identifiers 5

Medicaid001187897CT
Other18789CT · Ct. License
OtherM-1925GU · Guam License
Other06-1088532Tax Id #
Other1683CT · Ct Controlled Substance

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ivan Stephen Lowenthal M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 96913 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$180.05 typical visit price
range $60.53 – $180.05
Typical copayment $45.01 (range $15.13 – $45.01)
Most-billed visit code 99205
Established Patient
$105.65 typical visit price
range $20.09 – $147.56
Typical copayment $26.41 (range $5.02 – $36.89)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ivan Lowenthal's NPI number?

The NPI number for Ivan Lowenthal is 1043245889. It was assigned to this individual provider in the NPPES registry on July 11, 2006.

Where is Ivan Lowenthal located?

Ivan Lowenthal practices at 633 Gov Carlos Camacho Rd., Ste B5, Tamuning, GU 96913. The listed phone number is (671) 647-4656.

What is Ivan Lowenthal's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Is Ivan Lowenthal enrolled in Medicare?

Yes. Ivan Lowenthal is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Ivan Lowenthal was last updated on March 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.