Mark Niezgoda, LICSW
NPI 1447888946 · Clinical Social Worker · Seattle, WA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Niezgoda, LICSW is a Clinical Social Worker provider in Seattle, WA (NPI 1447888946).
Provider details
- NPI number
- 1447888946
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LICSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- LW60991792 (WA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-03-30
- Last updated
- 2020-03-30
- Certified
- 2020-03-30
Frequently asked questions
- What is Mark Niezgoda's NPI number?
- Mark Niezgoda's National Provider Identifier (NPI) is 1447888946, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Niezgoda's specialty?
- Mark Niezgoda is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Niezgoda located?
- Mark Niezgoda's practice location on file with NPPES is 4219 S Othello St Apt 517, Seattle, WA 98118-3886.
- What is Mark Niezgoda's phone number?
- The practice phone number listed in the NPPES registry for Mark Niezgoda is (206) 321-3997.
- Does Mark Niezgoda accept Medicare?
- Mark Niezgoda is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Niezgoda's NPI active?
- Yes — Mark Niezgoda's NPI (1447888946) is active in the NPPES registry as of the last update on 2020-03-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.