Illena K. Klassen, LCSW
Clinical Social Worker · Littleton, CO
Illena K. Klassen, LCSW is a clinical social worker with a practice address in Littleton, Colorado, and NPI 1316190192, issued on Oct 24, 2008. Check the license (Colorado 905, as entered in NPPES) with the Colorado board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Illena K. Klassen
- Credential
- LCSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License number
- 905 CO
Self-reported in NPPES; status is on the state search - Practice location
- 5257 S Wadsworth Blvd, Littleton, CO 80123
- Phone
- (303) 338-4545
- Enumerated
- Oct 24, 2008
- Record last updated
- Jul 21, 2022
- Medicaid ID
- 91139767 CO
- Medicare enrollment
- Enrolled (PECOS I20110511000356); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 7,356 in Colorado → Look up another NPI →
Also registered at 5257 S Wadsworth Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer BeckerRegistered Nurse1861529802
- Sally Berga, MDObstetrics & Gynecology Physician1689718488
- Deanna BezjakInternal Medicine Physician1487781407
- Amy BilyeuRegistered Nurse1447387469
- Christine Blanco, RNInternal Medicine Physician1659414746
- Camilla BordenLicensed Practical Nurse1639375025
Verify Illena K. Klassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Colorado board licenses this profession
Search for license 905Check 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
- Colorado Permanente Medical Group PCLittleton, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Illena K. Klassen among 7,356 clinical social worker records in Colorado
Illena K. Klassen, LCSW is one of 7,356 clinical social worker records with a practice address in Colorado. 14% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 17% of them.
- NPI issued2008 · 17% of these records are older, 79% newer
- In a Medicare fileYes · 14% of these records are
- In the CMS Doctors and Clinicians fileYes · 21% of these records are
- Graduated2000 · median 2014 among the 1,575 with a school on file
- Record last updated2022 · 46% 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 Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
266 clinical social worker records list a practice address in Littleton
They are 266 of the 3,918 NPPES records with a practice address in Littleton, and 7,356 clinical social worker records in Colorado.
All 7,356 in Colorado → Every provider in Littleton → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Leanne Black, LEANNE BLACKLittleton, CO 801231154477024
- Elena Davis, LCSWLittleton, CO 801231780714543
- Lisa Deboer, LCSWLittleton, CO 801231841486891
- Kathleen Huling, L.C.S.W.Littleton, CO 801231437239324
- Harriet Ivker, MSWLittleton, CO 801231821023656
- Susan James-PadillaLittleton, CO 801231174822795
- Jennifer Leblanc, LCSWLittleton, CO 801231992003982
- Katherine Lister, LCSWLittleton, CO 801231821319666
Common questions
What is Illena K. Klassen, LCSW's NPI number?
Illena K. Klassen, LCSW's National Provider Identifier (NPI) is 1316190192, issued on Oct 24, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Illena K. Klassen, LCSW located?
The NPPES record lists a practice address at 5257 S Wadsworth Blvd, Littleton, CO, 80123. Phone: (303) 338-4545. Providers update this record themselves, so call before visiting.
How can I verify Illena K. Klassen, LCSW's license?
NPPES lists Colorado license number 905, as entered by the provider. Search the Colorado 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.