DR. IAN H LEIBOWITZ M.D.
NPI 1225004815
Pediatrics - Pediatric Gastroenterology in Washington, DC
About Dr. Ian H Leibowitz M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. IAN H LEIBOWITZ M.D. (NPI 1225004815) is an individual pediatric gastroenterology provider in Washington, District Of Columbia, licensed in District Of Columbia (MDO46686) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Ian H Leibowitz M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Ian Leibowitz reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- 1,417 clinicians in this Medicare group
Falls Church, VA 22042
- Reassigned Medicare billing, Virginia enrollment
- 2,379 clinicians in this Medicare group
Fairfax, VA 22031
- Reassigned Medicare billing, Virginia enrollment
- 73 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20010 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WASHINGTON, DC 20010
WASHINGTON, DC 20010
WASHINGTON, DC 20010
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 Ian Leibowitz's NPI number?
The NPI number for Ian Leibowitz is 1225004815. It was assigned to this individual provider in the NPPES registry on February 24, 2006.
Where is Ian Leibowitz located?
Ian Leibowitz practices at 111 Michigan Ave NW, Washington, DC 20010. The listed phone number is (202) 476-5000.
What is Ian Leibowitz's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Gastroenterology, with taxonomy code 2080P0206X.
Is Ian Leibowitz enrolled in Medicare?
Yes. Ian Leibowitz is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Ian Leibowitz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ian Leibowitz reassigns Medicare benefits to 3 organizations: Children's Hospital (Washington, DC), Inova Health Care Services (Falls Church, VA) and Pediatric Specialists Of Virginia, LLC (Fairfax, VA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ian Leibowitz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ian Leibowitz accept?
Health plans from Oscar Health list Ian Leibowitz as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Ian Leibowitz was last updated on February 5, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years 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.
# Dr. Ian H Leibowitz, M.D. · NPI 1225004815
Pediatric Gastroenterology physician in Washington, District of Columbia. Individual provider, active in the CMS NPPES registry since February 24, 2006.
## Identity
- **NPI:** 1225004815 (Entity type: Individual)
- **Enumerated:** February 24, 2006
- **Primary specialty:** Pediatrics - Pediatric Gastroenterology · taxonomy 2080P0206X
- **State license:** MDO46686 (District of Columbia)
- **Sole proprietor:** No
## Practice location
- **Address:** 111 MICHIGAN AVE NW, Washington, DC 20010
- **Phone:** (202) 476-5000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Children's Hospital (NPI 1780800128, Washington, DC); Inova Health Care Services (NPI 1588717755, Falls Church, VA); Pediatric Specialists Of Virginia, LLC (NPI 1699119818, Fairfax, VA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 5, 2019
- **Other identifiers:** Medicaid 6071787 (VA)
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Source: [NPI Profile](https://npiprofile.com/npi/1225004815) · Data from the CMS NPPES public registry.