NPPES file of Aug 9, 2026

Diana L. Oakley, APN

Nurse Practitioner · Mattoon, IL

Diana L. Oakley, APN is a nurse practitioner with a practice address in Mattoon, Illinois, and NPI 1033431580, issued on Feb 25, 2010. Check the license (Illinois 209008054, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1033431580
Name
Diana L. Oakley
Credential
APN
Primary taxonomy
Nurse Practitioner 363L00000X
License number
209008054 IL
Self-reported in NPPES; status is on the state search
Practice location
1005 Health Center Dr Ste 104, Mattoon, IL 61938
Phone
(217) 258-2178
Enumerated
Feb 25, 2010
Record last updated
Jan 16, 2020 (not updated in 6 years: call before relying on the address or phone)
Fax
(217) 258-4024
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest nurse practitioner records → All 4,892 in Illinois → Look up another NPI →

Also registered at 1005 Health Center Dr Ste 104

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Stacey Harminson, PA-CPhysician Assistant1710093018
  2. Luke Zumbahlen, FNP-CFamily Nurse Practitioner1851891170

Verify Diana L. Oakley in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Illinois board licenses this profession
    Search for license 209008054    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

98% fewer Medicare Part D claims than the average nurse practitioner in 2024

24 Medicare Part D claims, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D.

  1. Diana Oakley24
  2. Specialty average1,109

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Diana L. Oakley among 4,892 nurse practitioner records in Illinois

Diana L. Oakley, APN is one of 4,892 nurse practitioner records with a practice address in Illinois. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 18% of them.

  • NPI issued2010 · 18% of these records are older, 80% newer
  • In a Medicare fileYes · 81% of these records are
  • In the CMS Doctors and Clinicians fileNo · 69% of these records are
  • Record last updated2020 · 36% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

15 nurse practitioner records list a practice address in Mattoon

They are 15 of the 803 NPPES records with a practice address in Mattoon, and 4,892 nurse practitioner records in Illinois.

All 4,892 in Illinois → Every provider in Mattoon → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Amber Dust, APRN, CNPMattoon, IL 619381790454577
  2. Heather Heicher, APNMattoon, IL 619381952753576
  3. Jason Jenkins, NPMattoon, IL 619381639570476
  4. Michelle Mathews, APNMattoon, IL 619381902101355
  5. Jason Mathews, APNMattoon, IL 619381760922397
  6. Jodi Morrisey, APNMattoon, IL 619381487948303
  7. Kim Ohl, NPMattoon, IL 619381760609499
  8. Nora PorterMattoon, IL 619381245773852

Common questions

What is Diana L. Oakley, APN's NPI number?

Diana L. Oakley, APN's National Provider Identifier (NPI) is 1033431580, issued on Feb 25, 2010. An NPI identifies a provider in billing; it is not a license.

Where is Diana L. Oakley, APN located?

The NPPES record lists a practice address at 1005 Health Center Dr Ste 104, Mattoon, IL, 61938. Phone: (217) 258-2178. Providers update this record themselves, so call before visiting.

How can I verify Diana L. Oakley, APN's license?

NPPES lists Illinois license number 209008054, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.

How much does Diana L. Oakley, APN prescribe under Medicare Part D?

In 2024, Diana L. Oakley, APN had 24 Medicare Part D claims; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.