Diana K. Koala, MD
Obstetrics & Gynecology Physician · Seattle, WA
Diana K. Koala, MD is an obstetrics & gynecology physician with a practice address in Seattle, Washington, and NPI 1811969801, issued on Feb 3, 2006. Check the license (Washington MD00037938, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Diana K. Koala
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- MD00037938 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1101 Madison St, Seattle, WA 98104
- Phone
- (206) 682-5800
- Enumerated
- Feb 3, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (206) 233-9657
- Medicaid ID
- 7086887 WA
- Medicare enrollment
- Enrolled (PECOS I20060110000954); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 1994
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 1,038 in Washington → Look up another NPI →
Also registered at 1101 Madison St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Diana K. Koala in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00037938Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
91 Medicare Part D claims for 32 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Estradiol40 claims
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.
Bills Medicare through one group practice
- Womens Healthcare Alliance PLLCSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Diana K. Koala among 1,038 obstetrics & gynecology physician records in Washington
Diana K. Koala, MD is one of 1,038 obstetrics & gynecology physician records with a practice address in Washington. 68% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 52% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated1994 · median 2007 among the 582 with a school on file
- Record last updated2007 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Washington
There are 1,038 obstetrics & gynecology physician records in Washington.
All 1,038 in Washington → Every provider in Seattle → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Susan Block, MDSeattle, WA 981041285621771
- Karen Bohmke, MDSeattle, WA 981041003802679
- Ann Bridges, M.D.Seattle, WA 981041811963424
- Robin Cole, MDSeattle, WA 981041043206717
- Sarah Delatorre, MDSeattle, WA 981041104899673
- Philip Dubois, M.D.Seattle, WA 981041578552238
- Nancy Gregory-Hoefling, ARNPSeattle, WA 981041124091517
- Elena Hannon, M.D.Seattle, WA 981041437126067
Common questions
What is Diana K. Koala, MD's NPI number?
Diana K. Koala, MD's National Provider Identifier (NPI) is 1811969801, issued on Feb 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Diana K. Koala, MD located?
The NPPES record lists a practice address at 1101 Madison St, Seattle, WA, 98104. Phone: (206) 682-5800. Providers update this record themselves, so call before visiting.
How can I verify Diana K. Koala, MD's license?
NPPES lists Washington license number MD00037938, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Diana K. Koala, MD prescribe under Medicare Part D?
In 2024, Diana K. Koala, MD had 91 Medicare Part D claims for 32 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.