DELWYN LEE LASSEN (MD) – Family Medicine Physician, NPI 1558346015
Family Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
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Provider Addresses for DELWYN LEE LASSEN (MD)
338, 1st Avenue Northwest, Sioux Center, Sioux County, Iowa, 51250, United States
SIOUX CENTER, IA 512501875
Phone: (712) 722-1700
Fax: (712) 722-1770
Type: Mailing
33 4TH ST NW
SIOUX CENTER, IA 512501870
Phone: (712) 722-1700
Fax: (712) 722-1770
Type: Location
2501 Pierce St
Sioux City, IA 511043725
Phone: (712) 294-5000
Fax: (712) 294-5091
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2010-07-08
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100708000987 | I | Family Practice | IA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 51250)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IA | |
| Clinical Social Worker | IA | |
| O P T O M E T R Y | CO | |
| Nurse Practitioner | IA | |
| - | MN | |
| Nurse Practitioner | IA | |
| Family Practice | IA | |
| - | IA | |
| - | SD | |
| Nurse Practitioner | IA |
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