KATHERINE LILJA
NPI 1477434611
Dietitian, Registered - Nutrition, Obesity and Weight Management in Fairfax, VA
About Katherine Lilja NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KATHERINE LILJA (NPI 1477434611) is an individual nutrition, obesity and weight management provider in Fairfax, Virginia and active in the NPI registry since September 2025. She is a graduate of Oakland College Of Medicine And Surgery (2022).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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
Katherine Lilja 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 Reassignment
Medicare enrollment records show Katherine Lilja reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Fairfax, VA 22031
- Reassigned Medicare billing, District of Columbia enrollment
- 2,618 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.
Other Providers at the Same Location NPPES 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
FAIRFAX, VA 22033
FAIRFAX, VA 22033
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 Katherine Lilja's NPI number?
The NPI number for Katherine Lilja is 1477434611. It was assigned to this individual provider in the NPPES registry on September 11, 2025.
Where is Katherine Lilja located?
Katherine Lilja practices at 3580 Joseph Siewick Dr Ste 205, Fairfax, VA 22033. The listed phone number is (703) 620-3211.
What is Katherine Lilja's specialty?
The primary specialty registered for this NPI is Dietitian, Registered, specializing in Nutrition, Obesity and Weight Management, with taxonomy code 133VN1201X.
Is Katherine Lilja enrolled in Medicare?
Yes. Katherine Lilja 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 organization bills Medicare for Katherine Lilja's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Lilja reassigns Medicare benefits to Inova Health Care Services (Fairfax, VA). The 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 Katherine Lilja's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Katherine Lilja accept?
Health plans from Oscar Health list Katherine Lilja 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 Katherine Lilja was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Katherine Lilja · NPI 1477434611
Nutrition, Obesity and Weight Management provider in Fairfax, Virginia. Individual provider, active in the CMS NPPES registry since September 11, 2025.
## Identity
- **NPI:** 1477434611 (Entity type: Individual)
- **Enumerated:** September 11, 2025
- **Primary specialty:** Dietitian, Registered - Nutrition, Obesity and Weight Management · taxonomy 133VN1201X
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3580 JOSEPH SIEWICK DR STE 205, Fairfax, VA 22033-1764
- **Phone:** (703) 620-3211
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** Inova Health Care Services (NPI 1669511051, Fairfax, VA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Oakland College Of Medicine And Surgery, class of 2022
## Record status
- **NPPES last updated:** September 11, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1477434611) · Data from the CMS NPPES public registry.