Matthew J. Siekkinen, LCSW
Clinical Social Worker · Greencastle, IN
Matthew J. Siekkinen, LCSW is a clinical social worker with a practice address in Greencastle, Indiana, and NPI 1003308768, issued on May 30, 2018. Check the license (Indiana 34012446A, as entered in NPPES) with the Indiana board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Matthew J. Siekkinen
- Credential
- LCSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License numbers
- 34012446A IN
33007302A IN
Self-reported in NPPES; status is on the state search - Practice location
- 239 Hillsdale Ave, Greencastle, IN 46135
- Phone
- (765) 653-1024
- Enumerated
- May 30, 2018
- Record last updated
- Dec 8, 2025
- Medicare enrollment
- Enrolled (PECOS I20251222000146); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 5,650 in Indiana → Look up another NPI →
Also registered at 239 Hillsdale Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shayna Aguilar, NPPsychiatric/Mental Health Nurse Practitioner1275159485
- Shirl Barker, PH.D., NCC, LMHCMental Health Counselor1447259585
- Maya Bates, MSMental Health Counselor1255089967
- Wendy Culley, LMHCMental Health Counselor1831049923
- Elizabeth Delaney, LCSW, LMFTClinical Social Worker1740248418
- Dana Glessner, LCSWClinical Social Worker1962871129
Verify Matthew J. Siekkinen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Indiana board licenses this profession
Search for license 34012446ACheck 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
- Hamilton Center, Inc.Terre Haute, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Matthew J. Siekkinen among 5,650 clinical social worker records in Indiana
Matthew J. Siekkinen, LCSW is one of 5,650 clinical social worker records with a practice address in Indiana. 19% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 61% of them.
- NPI issued2018 · 61% of these records are older, 35% newer
- In a Medicare fileYes · 19% of these records are
- In the CMS Doctors and Clinicians fileYes · 25% of these records are
- Graduated2013 · median 2012 among the 1,393 with a school on file
- Record last updated2025 · 54% 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 Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 clinical social worker records list a practice address in Greencastle
They are 12 of the 224 NPPES records with a practice address in Greencastle, and 5,650 clinical social worker records in Indiana.
All 5,650 in Indiana → Every provider in Greencastle → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Erica Bodeker, MSWGreencastle, IN 461351033723135
- Sydni Brown, LCSWGreencastle, IN 461351003204736
- Elizabeth Delaney, LCSW, LMFTGreencastle, IN 461351740248418
- Erin Flick, LCSW, LCACGreencastle, IN 461351891230686
- Dana Glessner, LCSWGreencastle, IN 461351962871129
- Amanda Lewellen, MSW, LCSWGreencastle, IN 461351730132317
- Cortney Miller, LCSW, LCACGreencastle, IN 461351619201498
- Sarah Rohder, MSWGreencastle, IN 461351568020840
Common questions
What is Matthew J. Siekkinen, LCSW's NPI number?
Matthew J. Siekkinen, LCSW's National Provider Identifier (NPI) is 1003308768, issued on May 30, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Matthew J. Siekkinen, LCSW located?
The NPPES record lists a practice address at 239 Hillsdale Ave, Greencastle, IN, 46135. Phone: (765) 653-1024. Providers update this record themselves, so call before visiting.
How can I verify Matthew J. Siekkinen, LCSW's license?
NPPES lists Indiana license number 34012446A, as entered by the provider. Search the Indiana 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.