What is Jonathan Williams's NPI number?

Jonathan Williams's National Provider Identifier (NPI) is 1013195650, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Jonathan Williams's specialty?

Jonathan Williams is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).

Where is Jonathan Williams located?

Jonathan Williams's practice location on file with NPPES is 510 Green Bay Rd, Kenilworth, IL 60043-1002.

What is Jonathan Williams's phone number?

The practice phone number listed in the NPPES registry for Jonathan Williams is (847) 256-3400.

Does Jonathan Williams accept Medicare?

Jonathan Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Jonathan Williams's NPI active?

Yes — Jonathan Williams's NPI (1013195650) is active in the NPPES registry as of the last update on 2013-05-31.

IndividualActiveAccepts Medicare

Jonathan Williams, D.0.

NPI 1013195650 · Gastroenterology Physician · Kenilworth, IL

Jonathan Williams, D.0. is a Gastroenterology Physician provider in Kenilworth, IL (NPI 1013195650).

Provider details

NPI number: 1013195650
Entity type: Individual
Primary specialty: Gastroenterology PhysicianAllopathic & Osteopathic Physicians
Credential: D.0.
Sex: Male
Sole proprietor: No
License: 036-111829 (IL)

Practice location

510 Green Bay Rd

Kenilworth, IL 60043-1002

Phone: (847) 256-3400

Fax: (847) 256-3412

Street-level locationGet directions

More IL providers

Mailing address

510 Green Bay Rd

Kenilworth, IL 60043-1002

Specialties & taxonomies

Gastroenterology PhysicianPrimary207RG0100XLicense 036-111829 (IL)
Allopathic & Osteopathic Physicians

Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Detailed profile(92/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure25% of score
18 yrs in NPPES registry
Profile completeness25% of score
100% of core fields populated
Practice footprint15% of score
1 documented practice location
Medicare service volume (vs. specialty peers)25% of score
3,749 Medicare services, 2024 (ranked within specialty)
Open Payments transparency10% of score
Has Open Payments disclosures (2024)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305	1,049	$36
Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213	478	$68
Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214	362	$101
Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239	269	$95
Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342	259	$34
Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 24 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Omeprazole	503	165
Pantoprazole Sodium	134	38
Famotidine	73	22
Mesalamine	47	14
Budesonidebrand: Budesonide Dr	44	11
Linaclotidebrand: Linzess	39	—
Lipase/Protease/Amylasebrand: Creon	34	—

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$164 across 2 records (Open Payments 2024)

Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.

Enumerated: 2008-02-06
Last updated: 2013-05-31

Frequently asked questions

What is Jonathan Williams's NPI number?: Jonathan Williams's National Provider Identifier (NPI) is 1013195650, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Jonathan Williams's specialty?: Jonathan Williams is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
Where is Jonathan Williams located?: Jonathan Williams's practice location on file with NPPES is 510 Green Bay Rd, Kenilworth, IL 60043-1002.
What is Jonathan Williams's phone number?: The practice phone number listed in the NPPES registry for Jonathan Williams is (847) 256-3400.
Does Jonathan Williams accept Medicare?: Jonathan Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Jonathan Williams's NPI active?: Yes — Jonathan Williams's NPI (1013195650) is active in the NPPES registry as of the last update on 2013-05-31.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305	1,049	$36
Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213	478	$68
Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214	362	$101
Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239	269	$95
Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342	259	$34
Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare

Drug

Part D claims (2024)

Beneficiaries

Omeprazole

503

165

Pantoprazole Sodium

134

Famotidine

Mesalamine

Budesonidebrand: Budesonide Dr

Linaclotidebrand: Linzess

—

Lipase/Protease/Amylasebrand: Creon

—

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$164 across 2 records (Open Payments 2024)

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

What this provider does (Medicare)

What this provider prescribes (Medicare Part D)

Transparency — industry payments

Registry dates

Frequently asked questions

Specialties & taxonomies

Frequently asked questions

Profile Score

What this provider does (Medicare)

What this provider prescribes (Medicare Part D)

Transparency — industry payments