Duncan Otieno Asaka
Registered Nurse · Madison, WI
Duncan Otieno Asaka is a registered nurse with a practice address in Madison, Wisconsin, and NPI 1457186694, issued on Sep 6, 2024. Check the license (Wisconsin 227414-30, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Duncan Otieno Asaka
- Primary taxonomy
- Registered Nurse 163W00000X
- License number
- 227414-30 WI
Self-reported in NPPES; status is on the state search - Practice location
- 600 Williamson St, Madison, WI 53703
- Phone
- (608) 266-0721
- Enumerated
- Sep 6, 2024
- Record last updated
- Sep 6, 2024
- Entity
- Type 1 · individual
8 nearest registered nurse records → All 4,628 in Wisconsin → Look up another NPI →
Also registered at 600 Williamson St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Duncan Otieno Asaka in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 227414-30Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average registered nurse in 2024
203 Medicare Part D claims for 50 beneficiaries, against an average of 678 among the 694 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Lorazepam18 claims
- Benztropine Mesylate17 claims
- Clozapine13 claims
- Olanzapine11 claims
- Vraylar11 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.
Duncan Otieno Asaka among 4,628 registered nurse records in Wisconsin
Duncan Otieno Asaka is one of 4,628 registered nurse records with a practice address in Wisconsin. under 1% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2024, is newer than 81% of them.
- NPI issued2024 · 81% of these records are older, 15% newer
- In a Medicare fileYes · under 1% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2024 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 163W00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
526 registered nurse records list a practice address in Madison
They are 526 of the 15,014 NPPES records with a practice address in Madison, and 4,628 registered nurse records in Wisconsin.
All 4,628 in Wisconsin → Every provider in Madison → Registered Nurse nationwide →
The 8 registered nurse records with the nearest ZIP codes
- Andrea ChilesMadison, WI 537031912134172
- Larissa Gearing-BundyMadison, WI 537031962709238
- Karl Gilbertson, R.N.Madison, WI 537031437176948
- Janice GrayMadison, WI 537031518274109
- Therese HarmesMadison, WI 537031063705937
- Leigh Hermanson, RNMadison, WI 537031295056679
- Kristen KrizMadison, WI 537031790082881
- Susan MickMadison, WI 537031891014361
Common questions
What is Duncan Otieno Asaka's NPI number?
Duncan Otieno Asaka's National Provider Identifier (NPI) is 1457186694, issued on Sep 6, 2024. An NPI identifies a provider in billing; it is not a license.
Where is Duncan Otieno Asaka located?
The NPPES record lists a practice address at 600 Williamson St, Madison, WI, 53703. Phone: (608) 266-0721. Providers update this record themselves, so call before visiting.
How can I verify Duncan Otieno Asaka's license?
NPPES lists Wisconsin license number 227414-30, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Duncan Otieno Asaka prescribe under Medicare Part D?
In 2024, Duncan Otieno Asaka had 203 Medicare Part D claims for 50 beneficiaries; the average among registered nurse prescribers was 678. 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.