Dr. Katherine Jennifer Koss , MD
Pediatrics β’ Bellevue, WA
13030 121st Way Ne
Bellevue, WA 98034
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
Practice Location & Contact Primary Location
13030 121st Way Ne
Bellevue, WA 98034
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Pediatrics: NPPES taxonomy is a reported classification, not proof of board certification.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019β2025.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Compared with the same specialty in Bellevue and Washington
85 active clinicians are listed under Pediatrics with a practice address in Bellevue, WA (1,752 in Washington).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Bellevue
0% of these 85 clinicians have the CMS telehealth indicator.
2.4% of these 85 clinicians are listed by CMS as accepting Medicare assignment.
Sources: CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2023-04-10NUCC Taxonomy Code: 208000000X
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 13030 121ST WAY NE, BELLEVUE, WA 98034 (Tel: 4258145170)
Registered at 13030 121ST WAY NE, SUITE #100, BELLEVUE, WA 98034
NPI status registered as active in NPPES database
Registered at 2700 NORTHUP WAY, BELLEVUE, WA 980041463 (Tel: 4254605634)
Registered at 14711 NE 29TH PL, SUITE #255, BELLEVUE, WA 980077666
Recorded as KATHERINE KOSS, MD
Pediatrics (license number reported to NPPES: WA MD60475519)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Mailing Address
13030 121st Way Ne, Suite #100
Bellevue, WA 98034