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DIANA L. OAKLEY APN
NPI 1033431580
Nurse Practitioner in Mattoon, IL

Active since February 25, 2010PECOS Enrolled
1005 HEALTH CENTER DR STE 104, MATTOON, IL 61938(217) 258-2178(217) 258-4024 Get Directions Write a Review

NPPES record last updated: January 16, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 16, 2020, Dec 10, 2018 (2 updates tracked since 2018).

About Diana L. Oakley Apn NPPES

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

DIANA L. OAKLEY APN (NPI 1033431580) is an individual nurse practitioner in Mattoon, Illinois, licensed in Illinois (209008054) and active in the NPI registry since February 2010. She is enrolled in Medicare PECOS and maintains a secondary practice location in Casey.

NPPES Registry Identity

NPI1033431580
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameDIANA L. OAKLEYCredential: APN
Location Address1005 HEALTH CENTER DR STE 104Mattoon, IL 61938-4637
Mailing Address1005 Health Center Dr Ste 201Mattoon, IL 61938-4693 · (217) 238-6055
Phone(217) 258-2178
Fax(217) 258-4024
Sole ProprietorNo
Enumeration DateFebruary 25, 2010
Last NPPES UpdateJanuary 16, 20202 updates tracked since enumeration
✔ NPI 1033431580 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363L00000X
License✔ Licensed in IL · 209008054
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.
1005 HEALTH CENTER DR STE 104, Mattoon, IL 61938
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Secondary Practice Location 1

Location 1934 N Route 49 Ste ACasey, IL 62420-1454 · Phone (217) 932-4061 · Fax (217) 932-5191

Other Identifiers 1

Other209008054IL · Illinois Division Of Professional Regulation

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Diana L. Oakley Apn is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Diana Oakley reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Sarah Bush Lincoln Health Center
0.1 mi
Family Medicine
1000 HEALTH CENTER DR
Mattoon, IL 61938
  • Reassigned Medicare billing, Illinois enrollment
  • 652 clinicians in this Medicare group
NPI 1568581379 (217) 258-2525

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 61938 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
$85.71 typical visit price
range $54.80 – $168.44
Typical copayment $21.42 (range $13.70 – $42.11)
Most-billed visit code 99203
Established Patient
$97.25 typical visit price
range $17.16 – $136.56
Typical copayment $24.31 (range $4.29 – $34.14)
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.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Home ventilator, any type, used with non-invasive interface, (e.g., mask, chest shell) E0466
DME-Other DME · category DE005N
1 supplier12 claims12 services$922.57 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

STACEY HARMINSON PA-C
Physician Assistant
1005 HEALTH CENTER DR STE 104
MATTOON, IL 61938
Coles County (217) 258-2178
LUKE RAY ZUMBAHLEN FNP-C
Nurse Practitioner (Family)
1005 HEALTH CENTER DR STE 104
MATTOON, IL 61938
Coles County (217) 258-2178

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 Diana Oakley's NPI number?

The NPI number for Diana Oakley is 1033431580. It was assigned to this individual provider in the NPPES registry on February 25, 2010.

Where is Diana Oakley located?

Diana Oakley practices at 1005 Health Center Dr Ste 104, Mattoon, IL 61938. The listed phone number is (217) 258-2178.

What is Diana Oakley's specialty?

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

Is Diana Oakley enrolled in Medicare?

Yes. Diana Oakley is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Diana Oakley's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Diana Oakley reassigns Medicare benefits to Sarah Bush Lincoln Health Center (Mattoon, 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 Diana Oakley's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Diana Oakley accept?

Health plans from Ambetter Health and Ambetter Health of Delaware list Diana Oakley 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 Diana Oakley was last updated on January 16, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.