LYNN SEWESTER UNDERWOOD MA, LCPC
NPI 1700353679
Counselor - Professional in O Fallon, IL
About Lynn Sewester Underwood Ma, Lcpc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LYNN SEWESTER UNDERWOOD MA, LCPC (NPI 1700353679) is an individual professional provider in O Fallon, Illinois, licensed in Illinois (180.011860) and active in the NPI registry since October 2018. She is enrolled in Medicare PECOS and is a graduate of Other (2015).
NPPES Registry Identity
Specialties & Licenses 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Lynn Sewester Underwood Ma, Lcpc is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Other Providers at the Same Location NPPES 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
O FALLON, IL 62269
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Lynn Underwood's NPI number?
The NPI number for Lynn Underwood is 1700353679. It was assigned to this individual provider in the NPPES registry on October 30, 2018.
Where is Lynn Underwood located?
Lynn Underwood practices at 791 Wall St, O Fallon, IL 62269. The listed phone number is (618) 514-1154.
What is Lynn Underwood's specialty?
The primary specialty registered for this NPI is Counselor, specializing in Professional, with taxonomy code 101YP2500X.
Is Lynn Underwood enrolled in Medicare?
Yes. Lynn Underwood is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
What insurance does Lynn Underwood accept?
Health plans from Providence Health Plan and UnitedHealthcare list Lynn Underwood as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Lynn Underwood was last updated on November 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Lynn Sewester Underwood, MA, LCPC · NPI 1700353679
Professional provider in O Fallon, Illinois. Individual provider, active in the CMS NPPES registry since October 30, 2018.
## Identity
- **NPI:** 1700353679 (Entity type: Individual)
- **Enumerated:** October 30, 2018
- **Primary specialty:** Counselor - Professional · taxonomy 101YP2500X
- **State license:** 180.011860 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 791 WALL ST, O Fallon, IL 62269-2087
- **Phone:** (618) 514-1154
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** November 17, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1700353679) · Data from the CMS NPPES public registry.