NPPES file of Aug 9, 2026

Mary T. Johnston, RN

Registered Nurse First Assistant · Naperville, IL

Mary T. Johnston, RN is a registered nurse first assistant with a practice address in Naperville, Illinois, and NPI 1659595494, issued on Apr 12, 2007. Check the license (Illinois 41199041, as entered in NPPES) with the Illinois board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

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

NPPES recordNPPES file of Aug 9, 2026
1659595494
Name
Mary T. Johnston
Credential
RN
Primary taxonomy
Registered Nurse First Assistant 163WR0006X
License number
41199041 IL
Self-reported in NPPES; status is on the state search
Practice location
120 Osler Drive, Naperville, IL 60540
Phone
(630) 428-2229
Enumerated
Apr 12, 2007
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
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.
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Verify Mary T. Johnston 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 41199041    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
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PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Registered Nurse First Assistant providers in Illinois

There are 90 registered nurse first assistant records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 90 in Illinois → Every provider in Naperville →

Other registered nurse first assistant records in Illinois

  1. Barbara Allen, RNFAColona, IL1417130022
  2. Donald Altgilbers, CRNFAQuincy, IL1770848368
  3. Mari Anderson, C.R.N.F.A.Elgin, IL1508048406
  4. Mary Bedford, RNFASpringfield, IL1275788143
  5. Shauna Bostian, RNFASwansea, IL1518119650
  6. Margaret Bowden, RNChicago, IL1467654913
  7. Susan BrachInverness, IL1700288115
  8. Wayne Branson, RNFARockford, IL1972749158
  9. Joan Brncich, RN.FAJoliet, IL1730343815
  10. Anastasia Brown, RNFAJoliet, IL1437244456

Common questions

What is Mary T. Johnston, RN's NPI number?

Mary T. Johnston, RN's National Provider Identifier (NPI) is 1659595494, issued on Apr 12, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Mary T. Johnston, RN located?

The NPPES record lists a practice address at 120 Osler Drive, Naperville, IL, 60540. Phone: (630) 428-2229. Providers update this record themselves, so call before visiting.

How can I verify Mary T. Johnston, RN's license?

NPPES lists Illinois license number 41199041, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity 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. 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.