Quick answers
- Does Mark J. Niezgoda accept Medicare assignment?
- Yes. Medicare's clinician data says Mark J. Niezgoda accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Mark J. Niezgoda's NPI number?
- 1447888946. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mark J. Niezgoda is enrolled with Medicare (CMS data updated October 2, 2026).
- 15 S Grady Way, Suite 500Renton, WA 98057 (425) 444‑5902
Group practices
Medicare enrollment lists Mark J. Niezgoda as a member of this group (CMS data updated October 2, 2026).
- Renton Counseling Center PLLC6 clinicians in the group
Specialties
- Clinical Social Workerprimary
Other clinical social workers in Renton
Clinicians with the same Medicare primary specialty in Renton, WA — not a recommendation.
Other clinicians in Renton Counseling Center PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447888946 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians