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TAMMY CHAVARRIA
NPI 1043677529
Nurse Practitioner in Oakbrook Terrace, IL

Active since January 28, 2016PECOS EnrolledAccepts Medicare Assignment
2 TRANSAM PLAZA DR STE 400, OAKBROOK TERRACE, IL 60181(630) 545-3766(630) 933-7392 Get Directions Write a Review

NPPES record last updated: January 6, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 6, 2021, Jan 28, 2016 (2 updates tracked since 2016).

About Tammy Chavarria NPPES

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

TAMMY CHAVARRIA (NPI 1043677529) is an individual nurse practitioner in Oakbrook Terrace, Illinois, licensed in Illinois (209005920) and active in the NPI registry since January 2016. She is enrolled in Medicare PECOS and is a graduate of Other (2000).

NPPES Registry Identity

NPI1043677529
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameTAMMY CHAVARRIA
Location Address2 TRANSAM PLAZA DR STE 400Oakbrook Terrace, IL 60181-4808
Mailing Address2 Transam Plaza Dr Ste 400Oakbrook Terrace, IL 60181-4808 · (630) 545-3766 · Fax (630) 933-7392
Phone(630) 545-3766
Fax(630) 933-7392
Sole ProprietorNo
Medical School CMSOtherGraduated 2000
Enumeration DateJanuary 28, 2016
Last NPPES UpdateJanuary 6, 20212 updates tracked since enumeration
NPPES CertifiedJanuary 6, 2021
✔ NPI 1043677529 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363L00000X
License✔ Licensed in IL · 209005920
Definition
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
Also ListedRegistered Nurse · Women's Health Care, AmbulatoryTaxonomy 163WW0101X · License 28172884A (IN), 041303804 (IL)
Also ListedNurse Practitioner · Women's HealthTaxonomy 363LW0102X · License 209005920 (IL), 71002390A (IN)
2 TRANSAM PLAZA DR STE 400, Oakbrook Terrace, IL 60181
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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

Tammy Chavarria 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 ID8628488616
PECOS Enrollment IDI20201103000509
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 Tammy Chavarria reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Northwestern Medical Faculty Foundation
20 mi
Multi-Specialty
DEPT 5777
Carol Stream, IL 60122
  • Reassigned Medicare billing, Illinois enrollment
  • 4,817 clinicians in this Medicare group
NPI 1346235314 (855) 694-2866

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 60181 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
$93.02 typical visit price
range $59.81 – $181.38
Typical copayment $23.25 (range $14.95 – $45.34)
Most-billed visit code 99203
Established Patient
$105.07 typical visit price
range $19.15 – $147.12
Typical copayment $26.26 (range $4.78 – $36.78)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Tammy Chavarria's NPI number?

The NPI number for Tammy Chavarria is 1043677529. It was assigned to this individual provider in the NPPES registry on January 28, 2016.

Where is Tammy Chavarria located?

Tammy Chavarria practices at 2 Transam Plaza Dr Ste 400, Oakbrook Terrace, IL 60181. The listed phone number is (630) 545-3766.

What is Tammy Chavarria's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Is Tammy Chavarria enrolled in Medicare?

Yes. Tammy Chavarria 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 Tammy Chavarria's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Tammy Chavarria reassigns Medicare benefits to Northwestern Medical Faculty Foundation (Carol Stream, IL). 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 Tammy Chavarria'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 Tammy Chavarria was last updated on January 6, 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.