Michael Janssen, MD
NPI 1194804161 · Internal Medicine Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Janssen, MD is a Internal Medicine Physician provider in Seattle, WA (NPI 1194804161).
Provider details
- NPI number
- 1194804161
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- RT-1351 (NH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,414 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 493 | $140 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 355 | $17 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 213 | $141 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 179 | $99 |
| Hemoglobin A1c Level83036 | 82 | $9 |
| Administration of Influenza Virus Vaccine |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 101 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 754 | 211 |
| Amlodipine Besylate | 285 | 80 |
| Lisinopril | 249 | 65 |
| Losartan Potassium | 237 | 70 |
| Levothyroxine Sodium | 180 | 49 |
| Hydrochlorothiazide | 169 | 50 |
| Metoprolol Succinate |
Practice location
Mailing address
Additional practice locations (1)
- 500 17th AveSeattle, WA 98122-5711Phone: (206) 320-2230Fax: (206) 320-3462
Registry dates
- Enumerated
- 2006-11-02
- Last updated
- 2020-10-07
- Certified
- 2020-10-07
Frequently asked questions
- What is Michael Janssen's NPI number?
- Michael Janssen's National Provider Identifier (NPI) is 1194804161, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Janssen's specialty?
- Michael Janssen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Janssen located?
- Michael Janssen's practice location on file with NPPES is 5350 Tallman Ave Nw, Seattle, WA 98107-5902.
- What is Michael Janssen's phone number?
- The practice phone number listed in the NPPES registry for Michael Janssen is (206) 320-3335.
- Does Michael Janssen accept Medicare?
- Michael Janssen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Janssen's NPI active?
- Yes — Michael Janssen's NPI (1194804161) is active in the NPPES registry as of the last update on 2020-10-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.