NPPES file of Aug 9, 2026

Abigail D. Duffy, MS CCC-SLP

Speech-Language Pathologist · Crystal Lake, IL

Abigail D. Duffy, MS CCC-SLP is a speech-language pathologist with a practice address in Crystal Lake, Illinois, and NPI 1407571995, issued on Oct 6, 2022. Check the license (Illinois 146016660, 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
1407571995
Name
Abigail D. Duffy
Credential
MS CCC-SLP
Primary taxonomy
Speech-Language Pathologist 235Z00000X
License numbers
146016660 IL
235Z00000X IL
Self-reported in NPPES; status is on the state search
Practice location
394 Federal Dr, Crystal Lake, IL 60014
Phone
(815) 459-3810
Enumerated
Oct 6, 2022
Record last updated
Oct 6, 2022
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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8 nearest speech-language pathologist records → All 10,224 in Illinois → Look up another NPI →

Also registered at 394 Federal Dr

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

  1. Sydney Anderson, M.A., CF-SLPSpeech-Language Pathologist1275305187
  2. Kaitlyn BarrettSpeech-Language Pathologist1932589553
  3. Margaret CrowleyOccupational Therapy Assistant1669899415
  4. Kirsten DionelaOccupational Therapist1427812593
  5. Michelle DvorakOccupational Therapy Assistant1144646266
  6. Jenna FrankSpeech-Language Pathologist1750216826

Verify Abigail D. Duffy 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 146016660    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

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Abigail D. Duffy among 10,224 speech-language pathologist records in Illinois

Abigail D. Duffy, MS CCC-SLP is one of 10,224 speech-language pathologist records with a practice address in Illinois. 3% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2022, is newer than 79% of them.

  • NPI issued2022 · 79% of these records are older, 17% newer
  • In a Medicare fileNo · 3% of these records are
  • In the CMS Doctors and Clinicians fileNo · 4% of these records are
  • Record last updated2022 · 67% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 235Z00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

81 speech-language pathologist records list a practice address in Crystal Lake

They are 81 of the 1,442 NPPES records with a practice address in Crystal Lake, and 10,224 speech-language pathologist records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 10,224 in Illinois → Every provider in Crystal Lake → Speech-Language Pathologist nationwide →

The 8 speech-language pathologist records with the nearest ZIP codes

  1. Sara Butler, M.A. CCC SLP LVillage Of Lakewood, IL 600141023158805
  2. Kimberly Doerr, MS/CCC-SLPCrystal Lake, IL 600141922094275
  3. Kaitlan FinnCrystal Lake, IL 600141083864235
  4. Christopher GatesCrystal Lake, IL 600141699853085
  5. Julie GatesCrystal Lake, IL 600141326126715
  6. Jessica Lang, M.S.Crystal Lake, IL 600141255400263
  7. Genevieve LeenanCrystal Lake, IL 600141649482829
  8. Katherine Meyer, M.S. CCC-SLPCrystal Lake, IL 600141497826689

Common questions

What is Abigail D. Duffy, MS CCC-SLP's NPI number?

Abigail D. Duffy, MS CCC-SLP's National Provider Identifier (NPI) is 1407571995, issued on Oct 6, 2022. An NPI identifies a provider in billing; it is not a license.

Where is Abigail D. Duffy, MS CCC-SLP located?

The NPPES record lists a practice address at 394 Federal Dr, Crystal Lake, IL, 60014. Phone: (815) 459-3810. Providers update this record themselves, so call before visiting.

How can I verify Abigail D. Duffy, MS CCC-SLP's license?

NPPES lists Illinois license number 146016660, 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.