Mark Koenen, MD
NPI 1649414301 · Psychiatry Physician · Seattle, WA
Mark Koenen, MD is a Psychiatry Physician provider in Seattle, WA (NPI 1649414301).
Provider details
- NPI number
- 1649414301
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD00041348 (WA)
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 tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Clozapine | 44 |
| Escitalopram Oxalate | 27 |
| Mirtazapine | 25 |
| Quetiapine Fumaratebrand: Quetiapine Fumarate Er | 18 |
| Lithium Carbonate | 17 |
| Clonazepam | 16 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-04-26
- Last updated
- 2010-04-14
Frequently asked questions
- What is Mark Koenen's NPI number?
- Mark Koenen's National Provider Identifier (NPI) is 1649414301, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Koenen's specialty?
- Mark Koenen is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Koenen located?
- Mark Koenen's practice location on file with NPPES is 601 Union St, Seattle, WA 98101-2341.
- What is Mark Koenen's phone number?
- The practice phone number listed in the NPPES registry for Mark Koenen is (206) 623-1949.
- Is Mark Koenen's NPI active?
- Yes — Mark Koenen's NPI (1649414301) is active in the NPPES registry as of the last update on 2010-04-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.