Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. WILLIAM JOSEPH FRERICKS DDS
NPI 1427050608
Dentist in Chicago, IL

Q: What is William Frericks's NPI number?

The NPI number for William Frericks is 1427050608. It was assigned to this individual provider in the NPPES registry on June 1, 2005.

Q: What is William Frericks's specialty?

The primary specialty registered for this NPI is Dentist with taxonomy code 122300000X.

Q: Is William Frericks enrolled in Medicare?

No. William Frericks has opted out of Medicare through November 4, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for William Frericks was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days 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.

Active since June 01, 2005Opted out of Medicare · through Nov 4, 2027

500 N MICHIGAN AVE, STE 520, CHICAGO, IL 60611(312) 337-4424(312) 822-0877 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Dr. William Joseph Frericks Dds NPPES

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

DR. WILLIAM JOSEPH FRERICKS DDS (NPI 1427050608) is an individual dentist in Chicago, Illinois and active in the NPI registry since June 2005. He has opted out of Medicare through November 4, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1427050608

Entity TypeIndividualMale

Primary Taxonomy122300000X

Provider Legal NameDR. WILLIAM JOSEPH FRERICKSCredential: DDS

Location Address500 N MICHIGAN AVE, STE 520Chicago, IL 60611-3755

Mailing Address500 N Michigan Ave, Ste 520Chicago, IL 60611-3755 · (312) 337-4424 · Fax (312) 822-0877

Phone(312) 337-4424

Fax(312) 822-0877

Sole ProprietorNo

Enumeration DateJune 1, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1427050608 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentistDental Providers

Taxonomy Code122300000X

Definition

A dentist is a person qualified by a doctorate in dental surgery (D.D.S.) or dental medicine (D.M.D.), licensed by the state to practice dentistry, and practicing within the scope of that license. There is no difference between the two degrees: dentists who have a DMD or DDS have the same education. Universities have the prerogative to determine what degree is awarded. Both degrees use the same curriculum requirements set by the American Dental Association's Commission on Dental Accreditation. Generally, three or more years of undergraduate education plus four years of dental school is required to graduate and become a general dentist. State licensing boards accept either degree as equivalent, and both degrees allow licensed individuals to practice the same scope of general dentistry. Additional post-graduate training is required to become a dental specialist.

500 N MICHIGAN AVE, Chicago, IL 60611

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Humana.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. William Joseph Frericks Dds has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from November 4, 2015 through November 4, 2027.

Opt-Out Effective DateNovember 4, 2015

Opt-Out In Effect ThroughNovember 4, 2027Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60611 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

$94.06 typical visit price

range $60.08 – $183.39

Typical copayment $23.51 (range $15.02 – $45.84)

Most-billed visit code 99203

Established Patient

$74.80 typical visit price

range $18.97 – $148.12

Typical copayment $18.70 (range $4.74 – $37.03)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KRIS G MCGRATH MD SC

Clinic/Center (Medical Specialty)

500 N MICHIGAN AVE, SUITE 1640
CHICAGO, IL 60611

Cook County (312) 222-9500

DR. KAROLYN A WEBSTER EDD, ALMFT

Marriage & Family Therapist

500 N MICHIGAN AVE
CHICAGO, IL 60611

Cook County (708) 637-1672

DR. IKRAM HASSAN PSY.D

Counselor (Mental Health)

500 N MICHIGAN AVE
CHICAGO, IL 60611

Cook County (888) 466-0674

SHANNON HOCK LCPC

Counselor (Mental Health)

500 N MICHIGAN AVE, SUITE 1530
CHICAGO, IL 60611

Cook County (847) 868-3435

JULIA PFEIFFER RD

Dietitian, Registered

500 N MICHIGAN AVE, SUITE 1530
CHICAGO, IL 60611

Cook County (847) 868-3435

MS. MARY CATHERINE PAPPAS LCPC

Counselor (Professional)

500 N MICHIGAN AVE, SUITE #1520
CHICAGO, IL 60611

Cook County (312) 787-5840

DR. VICTORIA CYNTHIA BUCHANAN MD

Internal Medicine

500 N MICHIGAN AVE, SUITE 450
CHICAGO, IL 60611

Cook County (312) 276-1212

DR. KRIS G MCGRATH M.D.

Specialist

500 N MICHIGAN AVE, SUITE 1640
CHICAGO, IL 60611

Cook County (312) 222-9500

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 William Frericks's NPI number?

The NPI number for William Frericks is 1427050608. It was assigned to this individual provider in the NPPES registry on June 1, 2005.

Where is William Frericks located?

William Frericks practices at 500 N Michigan Ave Ste 520, Chicago, IL 60611. The listed phone number is (312) 337-4424.

What is William Frericks's specialty?

The primary specialty registered for this NPI is Dentist with taxonomy code 122300000X.

Is William Frericks enrolled in Medicare?

No. William Frericks has opted out of Medicare through November 4, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

What insurance does William Frericks accept?

Health plans from Humana list William Frericks 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 William Frericks was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days 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.