NPPES file of Aug 9, 2026

William Joseph Frericks, DDS

Dentist · Chicago, IL

William Joseph Frericks, DDS is a dentist with a practice address in Chicago, Illinois, and NPI 1427050608, issued on Jun 1, 2005. Check the license 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
1427050608
Name
William Joseph Frericks
Credential
DDS
Primary taxonomy
Dentist 122300000X
Practice location
500 N Michigan Ave, Chicago, IL 60611
Phone
(312) 337-4424
Enumerated
Jun 1, 2005
Record last updated
Jul 13, 2026
Fax
(312) 822-0877
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 dentist records → All 4,522 in Illinois → Look up another NPI →

Also registered at 500 N Michigan Ave

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

  1. Christina Bigoness, RD, LDNRegistered Dietitian1700252459
  2. Erin BrewerProfessional Counselor1407226822
  3. Victoria Buchanan, MDInternal Medicine Physician1174552608
  4. Giulia Casani Pugno, AMFTMarriage & Family Therapist1588093181
  5. Amy CosbyProfessional Counselor1588034912
  6. Henry Fine, M.D.Psychiatry Physician1578603312

Verify William Joseph Frericks in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Illinois board licenses this professionCheck 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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36% fewer Medicare Part D claims than the average dentist in 2024

55 Medicare Part D claims for 31 beneficiaries, against an average of 86 among the 51,021 providers of this specialty who prescribed in Part D.

  1. William Frericks55
  2. Specialty average86

Most prescribed

  1. Amoxicillin44 claims

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.

William Joseph Frericks among 4,522 dentist records in Illinois

William Joseph Frericks, DDS is one of 4,522 dentist records with a practice address in Illinois. 64% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 98% newer
  • In a Medicare fileYes · 64% of these records are
  • In the CMS Doctors and Clinicians fileNo · under 1% of these records are
  • Record last updated2026 · 74% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 122300000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

1,148 dentist records list a practice address in Chicago

They are 1,148 of the 63,379 NPPES records with a practice address in Chicago, and 4,522 dentist records in Illinois.

All 4,522 in Illinois → Every provider in Chicago → Dentist nationwide →

The 8 dentist records with the nearest ZIP codes

  1. Daniel Au, DDSChicago, IL 606111992906309
  2. Kenneth Brooks, D.D.SChicago, IL 606111750584298
  3. William Couvelis, DDSChicago, IL 606111013043199
  4. Agatha Dziedziech, DDSChicago, IL 606111790851053
  5. William Friedrich, DDSChicago, IL 606111225175805
  6. Robin Gay, DDSChicago, IL 606111548461940
  7. Ruth Griggs Nguyen, DDSChicago, IL 606111750447884
  8. Paul Landman, DDSChicago, IL 606111962603894

Common questions

What is William Joseph Frericks, DDS's NPI number?

William Joseph Frericks, DDS's National Provider Identifier (NPI) is 1427050608, issued on Jun 1, 2005. An NPI identifies a provider in billing; it is not a license.

Where is William Joseph Frericks, DDS located?

The NPPES record lists a practice address at 500 N Michigan Ave, Chicago, IL, 60611. Phone: (312) 337-4424. Providers update this record themselves, so call before visiting.

How can I verify William Joseph Frericks, DDS's license?

Search the Illinois board that licenses this profession; the NPPES record confirms identity only.

How much does William Joseph Frericks, DDS prescribe under Medicare Part D?

In 2024, William Joseph Frericks, DDS had 55 Medicare Part D claims for 31 beneficiaries; the average among dentist prescribers was 86. 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.