Christopher J. Ko, M.D.
Internal Medicine Physician · Vienna, VA
Christopher J. Ko, M.D. is an internal medicine physician with a practice address in Vienna, Virginia, and NPI 1255364105, issued on Jul 7, 2006. Check the license (Virginia 0101256632, as entered in NPPES) on the Virginia Department of Health Professions; the Medicare figures below come from public CMS files.
- Name
- Christopher J. Ko
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 0101256632 VA
D0071763 MD
25MA08039300 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 8133 Leesburg Pike, Vienna, VA 22182
- Phone
- (703) 291-0021
- Enumerated
- Jul 7, 2006
- Record last updated
- Sep 8, 2023
- Medicare enrollment
- Enrolled (PECOS I20150217001493); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 2003
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,599 in Virginia → Look up another NPI →
Also registered at 8133 Leesburg Pike
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Christopher J. Ko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersVirginia Department of Health Professions
Search for license 0101256632Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
133 Medicare Part D claims for 39 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Christopher J. Ko among 3,599 internal medicine physician records in Virginia
Christopher J. Ko, M.D. is one of 3,599 internal medicine physician records with a practice address in Virginia. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 55% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2003 · median 2003 among the 2,234 with a school on file
- Record last updated2023 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Virginia practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
38 internal medicine physician records list a practice address in Vienna
They are 38 of the 1,554 NPPES records with a practice address in Vienna, and 3,599 internal medicine physician records in Virginia.
All 3,599 in Virginia → Every provider in Vienna → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Woody Chang, M.D.Vienna, VA 221821659571743
- Parham Haghighi, M.D.Vienna, VA 221821134288699
- Sherry HossVienna, VA 221821972698066
- Ali Kamran, MDVienna, VA 221821487690129
- Patricia Ladisa-Gonzalez, MDVienna, VA 221821760648984
- Humera Malik, M.D.Vienna, VA 221821295744381
- Ramin MazhariVienna, VA 221821811041106
- Ali Mirebrahimi-Tafreshi, M.DVienna, VA 221821295860732
Common questions
What is Christopher J. Ko, M.D.'s NPI number?
Christopher J. Ko, M.D.'s National Provider Identifier (NPI) is 1255364105, issued on Jul 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christopher J. Ko, M.D. located?
The NPPES record lists a practice address at 8133 Leesburg Pike, Vienna, VA, 22182. Phone: (703) 291-0021. Providers update this record themselves, so call before visiting.
How can I verify Christopher J. Ko, M.D.'s license?
NPPES lists Virginia license number 0101256632, as entered by the provider. Search the Virginia Department of Health Professions at https://dhp.virginiainteractive.org/lookup/index. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Christopher J. Ko, M.D. prescribe under Medicare Part D?
In 2024, Christopher J. Ko, M.D. had 133 Medicare Part D claims for 39 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.