Mark J. Niezgoda, LICSW
Clinical Social Worker · Seattle, WA
Mark J. Niezgoda, LICSW is a clinical social worker with a practice address in Seattle, Washington, and NPI 1447888946, issued on Mar 30, 2020. Check the license (Washington LW60991792, as entered in NPPES) with the Washington board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark J. Niezgoda
- Credential
- LICSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License number
- LW60991792 WA
Self-reported in NPPES; status is on the state search - Practice location
- 4219 S Othello St Apt 517, Seattle, WA 98118
- Phone
- (206) 321-3997
- Enumerated
- Mar 30, 2020
- Record last updated
- Mar 30, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20250830000856); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 6,382 in Washington → Look up another NPI →
Verify Mark J. Niezgoda in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Washington board licenses this profession
Search for license LW60991792Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Renton Counseling Center PLLCRenton, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark J. Niezgoda among 6,382 clinical social worker records in Washington
Mark J. Niezgoda, LICSW is one of 6,382 clinical social worker records with a practice address in Washington. 9% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 65% of them.
- NPI issued2020 · 65% of these records are older, 30% newer
- In a Medicare fileYes · 9% of these records are
- In the CMS Doctors and Clinicians fileYes · 15% of these records are
- Graduated1993 · median 2010 among the 984 with a school on file
- Record last updated2020 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,704 clinical social worker records list a practice address in Seattle
They are 1,704 of the 41,956 NPPES records with a practice address in Seattle, and 6,382 clinical social worker records in Washington.
All 6,382 in Washington → Every provider in Seattle → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Ron Anders, LICSWSeattle, WA 981181356477053
- Sarah ArmstrongSeattle, WA 981181023210093
- Mary Anne Balch Speigel, MSWSeattle, WA 981181417013889
- Helen Estoque, MSWSeattle, WA 981181265414759
- Leslie Gilbert, MSWSeattle, WA 981181518150747
- Camie Goldhammer, MSW, LICSW, IBCLCSeattle, WA 981181972753606
- Theresa Hamrick, LISWSeattle, WA 981181447400999
- Keren Holt, LICSWSeattle, WA 981181144485103
Common questions
What is Mark J. Niezgoda, LICSW's NPI number?
Mark J. Niezgoda, LICSW's National Provider Identifier (NPI) is 1447888946, issued on Mar 30, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Mark J. Niezgoda, LICSW located?
The NPPES record lists a practice address at 4219 S Othello St Apt 517, Seattle, WA, 98118. Phone: (206) 321-3997. Providers update this record themselves, so call before visiting.
How can I verify Mark J. Niezgoda, LICSW's license?
NPPES lists Washington license number LW60991792, as entered by the provider. Search the Washington board that licenses this profession; the NPPES record confirms identity 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.