Karen Ama-Serwa Chachu, MD
Gastroenterology (CMS) · Oxon Hill, MD
At a glance
125 Potomac Psge Ste 250, Oxon Hill, MD 20745-1580
Published activity: Colonoscopy · Upper gastrointestinal (GI) endoscopy for acid reflux. View counts and coverage
NPPES record updated Jan 12, 2026. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
125 Potomac Psge Ste 250Oxon Hill, MD 20745-1580
Additional reported practice locations
6100 Executive Blvd Ste 301North Bethesda, MD 208523913
Phone: 2407370085
Fax: 2022960301 5500 Friendship Blvd Ste T90
Chevy Chase, MD 208157219
Phone: 2407370085
Fax: 2022960310 2000 Pennsylvania Ave Nw Ste 3010
Washington, DC 200061929
Phone: 2407370085
Fax: 2022960301
Education & affiliations
- Medical / professional school
- Washington College Of Physicians And Surgeons
- Graduation year
- 2009
- CMS specialties
- Gastroenterology
CMS reports telehealth services for this clinician. Confirm current services and availability with the practice.
Practice groups
Reported hospital affiliations
- Duke University Hospital Durham, NC
- Sibley Memorial Hospital Washington, DC
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Colonoscopy | 58 |
| Upper gastrointestinal (GI) endoscopy for acid reflux | 47 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $124.61 |
Reporting companies
| Company | Amount |
|---|---|
| ABBVIE INC. | $124.61 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Gastroenterology (CMS)
- Taxonomy code
- 207RG0100X
- Enumeration date
- May 12, 2009
- Record updated
- Jan 12, 2026
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
207RG0100X
License reported: MD600004807 DC
207R00000X
License reported: MT194931 PA
207RG0100X
License reported: 2015-01167 NC
207RG0100X · Primary
License reported: D0105263 MD
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
125 Potomac Psge Ste 250Oxon Hill, MD 20745-1580
- Phone
- (240) 737-0085
- Fax
- (202) 296-0301
Mailing address
10770 COLUMBIA PIKE STE 400SILVER SPRING, MD 209014462
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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