Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Diana K Koala, MD

Individual provider Obstetrics & Gynecology Physician · NPI 1811969801

Diana K Koala, MD practises Obstetrics/Gynecology in Seattle, Washington. Graduated from University of Washington School of Medicine in 1994, 32 years ago. Practices with Womens Healthcare Alliance PLLC, a 15-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
32
Trained at
University of Washington School of Medicine
Licensed in
WA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1101 Madison St Ste 950
Seattle, WA 98104-3592 Not confirmed with CMS for 19 years — call before visiting
Phone: (206) 682-5800
Fax: (206) 233-9657
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence MD00037938 (WA)

Record details

NPI number1811969801
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 3, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolUNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE
Graduated 1994 (32 years in practice)
Group practice Womens Healthcare Alliance Pllc — 15 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients27
Services billed 39 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Womens Healthcare Alliance PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 15 clinicians in the practice; 12 are shown here.

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