Oak Brook Allergists

What Oak Brook Allergists does

Oak Brook Allergists is a privately held allergy and immunology medical practice founded in 1962, headquartered operationally in Downers Grove, Illinois, and serving adult and pediatric patients across Will County and DuPage County. The practice runs four physical offices in Downers Grove, Elmhurst, Naperville, and Plainfield, supported by a clinical team of three board-certified allergists (David J. Knysak, MD; Raymond M. Pongonis Jr., MD; Zachary E. Rubin, MD), a physician assistant (Jennifer Catalfio, PA-C), and an advanced practice registered nurse (Tammy Laas, APRN-CNP). Service lines span diagnostic allergy testing (skin prick, patch, and Specific IgE blood tests), treatment of allergic rhinitis, asthma, chronic sinusitis, eczema, hives, food allergies, pet allergies, and stinging insect allergies, plus immunotherapy programs including allergy shots, sublingual immunotherapy, and oral immunotherapy (OIT) for food allergy desensitization.

The business operates on a professional services revenue model: the practice bills insurers and patients for office consultations, diagnostic procedures, and treatment courses, with specific procedure-level pricing not publicly disclosed. Distribution is direct-to-consumer via in-person visits at the four offices and call-in/telehealth consultations for existing patients with acute asthma, allergy, or sinus issues. The go-to-market is supported by an education-heavy website (oakbrookallergists.com), an A-to-Z patient education library, a regularly updated blog covering allergies, asthma, eczema, and immunotherapy, local SEO targeting DuPage and Will County terms, and a Facebook presence used for COVID-19 vaccine updates.

The technology stack is described as standard medical practice infrastructure: electronic health records, practice management systems, and patient communication platforms, with no proprietary AI or data assets. The practice is HIPAA-compliant for PHI handling and maintains WCAG 2.1 website accessibility. No funding rounds, acquisitions, parent entities, or institutional investors are referenced; the practice appears to be independently owned by its physician providers. The most recent observable operational shift is a transition to paperless billing statements effective February 1, 2026.

Name

Oak Brook Allergists

Legal name

Oak Brook Allergists

Website

https://oakbrookallergists.com

Company type

Private

Founded year

1962

Operating status

Operating

Headcount range

11–50 employees

Short description

Oak Brook Allergists is a private, multi-site allergy and immunology practice founded in 1962, serving adult and pediatric patients across DuPage and Will Counties, Illinois from four suburban Chicago offices with diagnostic testing, immunotherapy, and oral food allergy desensitization.

Ownership category

akta.pro rank

Headquarters

HQ city

Downers Grove

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Infrastructure, Technology or R&D

Revenue model

1. Patient Care Services: Medical services provided to patients including office consultations, allergy testing (skin prick tests, patch tests, blood tests), immunotherapy treatments (allergy shots, sublingual immunotherapy, oral immunotherapy), and follow-up care. Revenue is generated through insurance billing and patient payments.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

Oak Brook Allergists is a private allergy and immunology medical practice providing comprehensive diagnostic and treatment services for allergic conditions, asthma, and related immunological disorders. The practice serves both adult and pediatric patients across four office locations in Downers Grove, Elmhurst, Naperville, and Plainfield, Illinois, offering skin prick tests, blood tests, patch tests, immunotherapy (allergy shots, sublingual, and oral immunotherapy), and telehealth consultations for existing patients.

Product overview

Oak Brook Allergists is a unified medical practice offering comprehensive adult and pediatric allergy and immunology services. The practice operates across four locations in Illinois (Downers Grove, Elmhurst, Naperville, and Plainfield) and provides a full continuum of care including diagnostic allergy testing (skin prick tests, blood tests, patch tests), treatment of various allergic conditions (allergic rhinitis, asthma, chronic sinusitis, eczema, hives, food allergies, pet allergies, stinging insect allergies), and therapeutic interventions (oral immunotherapy, allergy shots, sublingual immunotherapy). The practice also offers telehealth consultations for existing patients and provides specialized services for pediatric patients. COVID-19 vaccine consultation is offered to help patients with allergy concerns evaluate vaccine safety.

Differentiator

Problem solved

Functional benefit

Products and services

• Allergic Rhinitis (Hay Fever) Treatment

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Scale indicators2 records

Recent moves6 records

Expansion highlights5 records

Others

• American College of Allergy, Asthma & Immunology (ACAAI): Professional medical society for allergists and a key reference/credentialing body in the U.S. allergy market. Not a competitor, but sets clinical standards and patient-education resources that shape Oak Brook Allergists' practice environment and patient expectations.
• Allergy & Asthma Network: National patient advocacy and education nonprofit for allergy, asthma, and immunology conditions. Adjacent ecosystem player that drives patient awareness and demand that ultimately funnels into community allergy practices like Oak Brook Allergists.

Direct peers

• Allergy Partners: The largest U.S. allergy, asthma, and immunology specialty practice network with multiple sites across many states. Directly comparable to Oak Brook Allergists in service mix (testing, shots, SLIT, food allergy), patient segments, and physician-led delivery model, but at materially greater scale and geographic breadth.
• Family Allergy & Asthma: Multi-location physician-led allergy and asthma practice serving multiple U.S. states. Closely comparable operating model to Oak Brook Allergists — board-certified allergists, in-office testing, immunotherapy, and pediatric/adult care — but with broader geographic reach.
• Asthma & Allergy Affiliates: Independent, multi-provider allergy and asthma practice with multiple office locations. Comparable in clinical scope (skin testing, immunotherapy, asthma management) and mid-sized community-practice profile, though operating in a different metro.

Broad incumbents

• Advocate Health Allergy/Immunology: Large Chicago-area health system operating allergy clinics in the western and southwestern suburbs that overlap Oak Brook Allergists' service area. Comparable clinical offerings but with system-level scale, payer contracts, and referral network advantages.
• Northwestern Medicine Allergy and Immunology: Major Chicago-area academic health system with a dedicated allergy/immunology program. Overlaps with Oak Brook Allergists in the same metro (Downers Grove, Naperville, Elmhurst service area) and competes for the same self- and physician-referred patients, but as one specialty within a much broader enterprise.
• Rush University Medical Center Allergy/Immunology: Chicago academic medical system with allergy/immunology clinical services. Comparable specialty capabilities to Oak Brook Allergists in the same broader metro, but with hospital-system scale, integrated primary care referrals, and academic reputation.
• UChicago Medicine Allergy and Immunology: Academic medical center in the Chicago market offering allergy and immunology services, including advanced diagnostics and food allergy/OIT programs. Comparable capabilities in the same geography, but embedded within a larger health system with different payer leverage.
• Loyola Medicine Allergy/Immunology: Academic health system based in Maywood, IL, with allergy/immunology services reaching into the western Chicago suburbs that overlap Oak Brook Allergists' market. Comparable specialty care from a larger enterprise competitor.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/oakbrookallergists
• LinkedInlinkedin.com/company/oakbrook-allergists-sc

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Oak Brook Allergists