Grace Claire Mathieson
Clinical Social Worker · Marysville, WA
Grace Claire Mathieson is a clinical social worker with a practice address in Marysville, Washington, and NPI 1457946196, issued on Mar 4, 2021. Check the license (Washington LW61165345, as entered in NPPES) with the Washington board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Grace Claire Mathieson
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License numbers
- LW61165345 WA
SC60754947 WA
Self-reported in NPPES; status is on the state search - Practice location
- 11603 State Ave Ste G, Marysville, WA 98271
- Phone
- (425) 316-5062
- Enumerated
- Mar 4, 2021
- Record last updated
- Nov 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (425) 259-8600
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 6,382 in Washington → Look up another NPI →
Also registered at 11603 State Ave Ste G
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Andreoni, MDInternal Medicine Physician1487754677
- Ryan MaziarzFamily Medicine Physician1861133837
- Sima Mistry, M.D.Pediatrics Physician1760625552
- Nhat Pham, DOFamily Medicine Physician1972098606
Verify Grace Claire Mathieson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Washington board licenses this profession
Search for license LW61165345Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 59.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Grace Claire Mathieson among 6,382 clinical social worker records in Washington
Grace Claire Mathieson 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 2021, is newer than 70% of them.
- NPI issued2021 · 70% of these records are older, 24% newer
- In a Medicare fileYes · 9% of these records are
- In the CMS Doctors and Clinicians fileNo · 15% of these records are
- Record last updated2021 · 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).
14 clinical social worker records list a practice address in Marysville
They are 14 of the 874 NPPES records with a practice address in Marysville, and 6,382 clinical social worker records in Washington.
All 6,382 in Washington → Every provider in Marysville → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Rebecca Barrett, LICSW, LMHCMarysville, WA 982711831706241
- Deanna Kazen, MSWMarysville, WA 982711932926375
- Janella LourencoMarysville, WA 982711497680367
- Diane McRae, LICSWMarysville, WA 982711306526298
- Joann MoffittTulalip, WA 982711821268483
- Leslie Peck, LCSW,LICSWMarysville, WA 982711922682673
- Casey BahrMonroe, WA 982721740658467
- Melinda BoonstraMarysville, WA 982701740530724
Common questions
What is Grace Claire Mathieson's NPI number?
Grace Claire Mathieson's National Provider Identifier (NPI) is 1457946196, issued on Mar 4, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Grace Claire Mathieson located?
The NPPES record lists a practice address at 11603 State Ave Ste G, Marysville, WA, 98271. Phone: (425) 316-5062. Providers update this record themselves, so call before visiting.
How can I verify Grace Claire Mathieson's license?
NPPES lists Washington license number LW61165345, as entered by the provider. Search the Washington board that licenses this profession; the NPPES record confirms identity only.
What is Grace Claire Mathieson's MIPS final score?
The 2023 MIPS final score is 59.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.