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LAUREN MARIE IVY SIEJA LCSW
NPI 1629645155
Social Worker - Clinical in Nacogdoches, TX

Active since June 03, 2021PECOS EnrolledAccepts Medicare Assignment
518 E HOSPITAL ST, NACOGDOCHES, TX 75961(936) 645-1090 Get Directions Write a Review

NPPES record last updated: June 3, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Lauren Marie Ivy Sieja Lcsw NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

LAUREN MARIE IVY SIEJA LCSW (NPI 1629645155) is an individual clinical provider in Nacogdoches, Texas, licensed in Texas (59857) and active in the NPI registry since June 2021. She is enrolled in Medicare PECOS and is a graduate of Other (2014).

NPPES Registry Identity

NPI1629645155
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameLAUREN MARIE IVY SIEJACredential: LCSW
Location Address518 E HOSPITAL STNacogdoches, TX 75961-5239
Mailing Address620 Mr Henrys DrNacogdoches, TX 75965-2646 · (936) 645-1090
Phone(936) 645-1090
Sole ProprietorYes
Medical School CMSOtherGraduated 2014
Enumeration DateJune 3, 2021
NPPES CertifiedJune 3, 2021
✔ NPI 1629645155 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in TX · 59857
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
518 E HOSPITAL ST, Nacogdoches, TX 75961
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Lauren Marie Ivy Sieja Lcsw 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.

PECOS PAC ID4082018106
PECOS Enrollment IDI20210811000421
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Lauren Ivy Sieja reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Georgetown Psychotherapy, PLLC
Same address
Clinical
518 E HOSPITAL STREET
Nacogdoches, TX 75961
  • Reassigned Medicare billing, Texas enrollment
  • 2 clinicians in this Medicare group
NPI 1225351794 (936) 462-8577

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 75961 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$0.00 typical visit price
range $54.84 – $166.88
Typical copayment $0.00 (range $13.71 – $41.72)
Most-billed visit code NA
Established Patient
$68.55 typical visit price
range $17.52 – $136.11
Typical copayment $17.13 (range $4.38 – $34.02)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. SYDNEY KROLL REGISTER PSY.D.
Psychologist (Clinical)
518 E HOSPITAL ST
NACOGDOCHES, TX 75961
Nacogdoches County (936) 462-8577
DR. LISA NICOLE MCCLEARY
Psychologist
518 E HOSPITAL ST
NACOGDOCHES, TX 75961
Nacogdoches County (936) 462-5877

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 Lauren Ivy Sieja's NPI number?

The NPI number for Lauren Ivy Sieja is 1629645155. It was assigned to this individual provider in the NPPES registry on June 3, 2021.

Where is Lauren Ivy Sieja located?

Lauren Ivy Sieja practices at 518 E Hospital St, Nacogdoches, TX 75961. The listed phone number is (936) 645-1090.

What is Lauren Ivy Sieja's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Lauren Ivy Sieja enrolled in Medicare?

Yes. Lauren Ivy Sieja 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.

Which organization bills Medicare for Lauren Ivy Sieja's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Lauren Ivy Sieja reassigns Medicare benefits to Georgetown Psychotherapy, PLLC (Nacogdoches, TX). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Lauren Ivy Sieja's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Lauren Ivy Sieja was last updated on June 3, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.