Claus Henner Janssen, M.D.
Family Medicine Physician · Port Townsend, WA
Claus Henner Janssen, M.D. is a family medicine physician with a practice address in Port Townsend, Washington, and NPI 1992758312, issued on May 18, 2006. Check the license (Washington MD00031036, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Claus Henner Janssen
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD00031036 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1010 Sheridan St, Port Townsend, WA 98368
- Phone
- (360) 385-3500
- Enumerated
- May 18, 2006
- Record last updated
- Nov 15, 2024
- Fax
- (360) 385-5496
- Medicaid ID
- 1084391 WA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Also registered at 1010 Sheridan St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Rebecca Kimball, A.R.N.P.Family Nurse Practitioner1437106432
- Jay Lawrence, DOSurgery Physician1659455095
Verify Claus Henner Janssen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00031036Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average family medicine physician in 2024
117 Medicare Part D claims for 34 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Spironolactone11 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.
Claus Henner Janssen among 5,534 family medicine physician records in Washington
Claus Henner Janssen, M.D. is one of 5,534 family medicine physician records with a practice address in Washington. 73% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2024 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
14 family medicine physician records list a practice address in Port Townsend
They are 14 of the 601 NPPES records with a practice address in Port Townsend, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Port Townsend → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Sarah Abhold, DOPort Townsend, WA 983681962991992
- Katherine Biccum, D.O.Port Townsend, WA 983681407236912
- Rachel Bickling, MDPort Townsend, WA 983681760587133
- Todd Carlson, M.D.Port Townsend, WA 983681164475554
- Stephen Erickson, MDPort Townsend, WA 983681932259587
- David Harris, M.D.Port Townsend, WA 983681154373553
- Shannan Kirchner, M.D.Port Townsend, WA 983681518994615
- Joseph Mattern, M.D.Port Townsend, WA 983681023060423
Common questions
What is Claus Henner Janssen, M.D.'s NPI number?
Claus Henner Janssen, M.D.'s National Provider Identifier (NPI) is 1992758312, issued on May 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Claus Henner Janssen, M.D. located?
The NPPES record lists a practice address at 1010 Sheridan St, Port Townsend, WA, 98368. Phone: (360) 385-3500. Providers update this record themselves, so call before visiting.
How can I verify Claus Henner Janssen, M.D.'s license?
NPPES lists Washington license number MD00031036, 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 Claus Henner Janssen, M.D. prescribe under Medicare Part D?
In 2024, Claus Henner Janssen, M.D. had 117 Medicare Part D claims for 34 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.