CHRISTOPHER J KO M.D.
NPI 1255364105
Internal Medicine in Vienna, VA
About Christopher J Ko M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CHRISTOPHER J KO M.D. (NPI 1255364105) is an individual internal medicine provider in Vienna, Virginia, licensed in Virginia (0101256632) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Northwestern University Feinberg Medical School (2003).
NPPES Registry Identity
Specialties & Licenses 2
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
Christopher J Ko M.d. 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 Christopher Ko reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Vienna, VA 22180
- Reassigned Medicare billing, District of Columbia and Virginia enrollments
- Also billed through NPI 1669511051 (District of Columbia)
- 160 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 22182 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 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
VIENNA, VA 22182
VIENNA, VA 22182
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 Christopher Ko's NPI number?
The NPI number for Christopher Ko is 1255364105. It was assigned to this individual provider in the NPPES registry on July 7, 2006.
Where is Christopher Ko located?
Christopher Ko practices at 8133 Leesburg Pike Suite 510, Vienna, VA 22182. The listed phone number is (703) 291-0021.
What is Christopher Ko's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Christopher Ko enrolled in Medicare?
Yes. Christopher Ko 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 Christopher Ko's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Christopher Ko reassigns Medicare benefits to Inova Health Care Services (Vienna, 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 Christopher Ko'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 Christopher Ko was last updated on September 8, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Christopher J Ko, M.D. · NPI 1255364105
Internal Medicine physician in Vienna, Virginia. Individual provider, active in the CMS NPPES registry since July 7, 2006.
## Identity
- **NPI:** 1255364105 (Entity type: Individual)
- **Enumerated:** July 7, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 0101256632 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 8133 LEESBURG PIKE, SUITE 510, Vienna, VA 22182-2751
- **Phone:** (703) 291-0021
## 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:** Inova Health Care Services (NPI 1275886418, Vienna, VA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Northwestern University Feinberg Medical School, class of 2003
## Record status
- **NPPES last updated:** September 8, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1255364105) · Data from the CMS NPPES public registry.