LIA ILONA LOSONCZY
NPI 1598082828
Internal Medicine - Critical Care Medicine in Washington, DC
About Lia Ilona Losonczy NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LIA ILONA LOSONCZY (NPI 1598082828) is an individual critical care medicine provider in Washington, District Of Columbia, licensed in District Of Columbia (MD046299) and active in the NPI registry since April 2010. She is enrolled in Medicare PECOS, maintains a secondary practice location in Baltimore, and is a graduate of Johns Hopkins University School Of Medicine (2012).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Lia Ilona Losonczy is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show Lia Losonczy reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Washington, DC 20037
- Reassigned Medicare billing, District of Columbia enrollment
- 1,275 clinicians in this Medicare group
Washington, DC 20036
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 3,530 clinicians in this Medicare group
Fairfax, VA 22033
- Reassigned Medicare billing, District of Columbia enrollment
- 71 clinicians in this Medicare group
Bloomfield, NM 87413
- Reassigned Medicare billing, Texas enrollment
- 572 clinicians in this Medicare group
Fairfield, CA 94533
- Reassigned Medicare billing, California enrollment
- 212 clinicians in this Medicare group
Newark, CA 94560
- Reassigned Medicare billing, California enrollment
- 900 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20037 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 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
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 Lia Losonczy's NPI number?
The NPI number for Lia Losonczy is 1598082828. It was assigned to this individual provider in the NPPES registry on April 26, 2010.
Where is Lia Losonczy located?
Lia Losonczy practices at 900 23rd St NW, Washington, DC 20037. The listed phone number is (202) 741-2911.
What is Lia Losonczy's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Lia Losonczy enrolled in Medicare?
Yes. Lia Losonczy is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Lia Losonczy's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Lia Losonczy reassigns Medicare benefits to 6 organizations: Medical Faculty Associates, Inc (Washington, DC), Medstar Medical Group II LLC (Washington, DC), Fair Oaks Emergency Physicians, PLLC (Fairfax, VA), Dhhs, Phs, Naihs, Shiprock Hospital (Bloomfield, NM), Solano Gateway Medical Group Inc (Fairfield, CA) and 1 more organization, listed in the Medicare section above. 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 Lia Losonczy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Lia Losonczy was last updated on July 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Lia Ilona Losonczy · NPI 1598082828
Critical Care Medicine physician in Washington, District of Columbia. Individual provider, active in the CMS NPPES registry since April 26, 2010.
## Identity
- **NPI:** 1598082828 (Entity type: Individual)
- **Enumerated:** April 26, 2010
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** MD046299 (District of Columbia)
- **Sole proprietor:** No
## Practice location
- **Address:** 900 23RD ST NW, Washington, DC 20037-2342
- **Phone:** (202) 741-2911 · **Fax:** (202) 741-2921
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Medical Faculty Associates, Inc (NPI 1417990581, Washington, DC); Medstar Medical Group II LLC (NPI 1376887844, Washington, DC); Fair Oaks Emergency Physicians, PLLC (NPI 1649203605, Fairfax, VA); Dhhs, Phs, Naihs, Shiprock Hospital (NPI 1760427587, Bloomfield, NM); Solano Gateway Medical Group Inc (NPI 1952344293, Fairfield, CA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Johns Hopkins University School Of Medicine, class of 2012
## Record status
- **NPPES last updated:** July 1, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1598082828) · Data from the CMS NPPES public registry.