> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/naics/621999/illinois/ # NAICS 621999 companies in Illinois Companies with NAICS code 621999 (All Other Miscellaneous Ambulatory Health Care Services) headquartered in Illinois, with their cities, sizes and SIC codes. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** The biggest NAICS 621999 companies in Illinois by headcount range include Daniels Health, Howard Brown Health and Vitality Group. NAICS 621999 is the code for All Other Miscellaneous Ambulatory Health Care Services. Among those counted, they are mostly very small: 69% have 50 or fewer employees. ## Which NAICS 621999 companies are in Illinois? The biggest by headcount range include Daniels Health, Howard Brown Health, Vitality Group, Paradigm Healthcare and Vitae Health Systems. NAICS 621999 is the code for All Other Miscellaneous Ambulatory Health Care Services. Names link to a company profile where we have one. | Company | City | Employees | | --- | --- | --- | | Daniels Health | Chicago | 501 to 1,000 | | Howard Brown Health | Chicago | 501 to 1,000 | | Vitality Group | Chicago | 201 to 500 | | Paradigm Healthcare | Lincolnwood | 201 to 500 | | Vitae Health Systems | Chicago | 201 to 500 | | Marquee Health | Chicago | 51 to 200 | | Almost Home Kids | Naperville | 51 to 200 | | Zee Medical Billing | Evanston | 51 to 200 | | Impact Behavioral Health Partners | Evanston | 51 to 200 | | Absolute Solutions | Naperville | 51 to 200 | | The Center For Sleep Medicine | Orland Park | 51 to 200 | | T K Group | Cherry Valley | 51 to 200 | | Solvera Health | Peoria | 51 to 200 | | Crossing Healthcare | Decatur | 51 to 200 | | Arista Healthcare | Naperville | 51 to 200 | | Hallmark Healthcare Of Carlinville | Carlinville | 51 to 200 | | Rock River Healthcare | Rockford | 51 to 200 | | Regenerative Pain & Spine | Chicago | 51 to 200 | | Waltz Health | Chicago | 11 to 50 | | Triage Cancer | Chicago | 11 to 50 | | Suncloud Health | Northbrook | 11 to 50 | | Envizion Medical | Arlington Heights | 11 to 50 | | Prevail Health | Chicago | 11 to 50 | | Aivo Health | Chicago | 11 to 50 | | Lumina Health Partners | Chicago | 11 to 50 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## Which cities in Illinois? Within Illinois, Chicago (36%), Evanston (5%) and Naperville (5%) are the most common headquarters. **Figure: Cities of NAICS 621999 companies in Illinois.** Bars for the share of counted NAICS 621999 companies in Illinois headquartered in each city: Chicago 36%, Evanston 5%, Naperville 5%, Schaumburg 5%. *Share of counted NAICS 621999 companies in Illinois by headquarters city.* ## How big are they? 69% of the NAICS 621999 companies counted in Illinois have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. **Figure: Size of NAICS 621999 companies in Illinois.** Seven columns for the share of counted NAICS 621999 companies in Illinois in each employee range: 11 to 50 69%, 51 to 200 22%, 201 to 500 5%, 501 to 1,000 3%, 1,001 to 5,000 0%, 5,001 to 10,000 0%, 10,001+ 0%. *Share of counted NAICS 621999 companies in Illinois in each employee range.* ## How do you reach the people at these Illinois companies? The people to talk to are usually operations, IT and finance leaders. Build the list in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the companies with NAICS code 621999 in Illinois ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the operations, IT and finance leaders at companies with NAICS code 621999 in Illinois, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore About the code: [NAICS 621999: All Other Miscellaneous Ambulatory Health Care Services](https://enrich.chat/naics/621999/). About the place: [companies in Illinois](https://enrich.chat/companies-in/illinois/). NAICS 621999 in other states: [California](https://enrich.chat/naics/621999/california/)[Texas](https://enrich.chat/naics/621999/texas/)[Florida](https://enrich.chat/naics/621999/florida/)[Colorado](https://enrich.chat/naics/621999/colorado/)[Arizona](https://enrich.chat/naics/621999/arizona/) Other NAICS codes in Illinois: [NAICS 541511: Custom Computer Programming Services](https://enrich.chat/naics/541511/illinois/)[NAICS 541512: Computer Systems Design Services](https://enrich.chat/naics/541512/illinois/)[NAICS 722511: Full-Service Restaurants](https://enrich.chat/naics/722511/illinois/)[NAICS 531210: Offices of Real Estate Agents](https://enrich.chat/naics/531210/illinois/)[NAICS 524210: Insurance Agencies and Brokerages](https://enrich.chat/naics/524210/illinois/)[NAICS 541613: Marketing Consulting Services](https://enrich.chat/naics/541613/illinois/)[NAICS 621111: Offices of Physicians](https://enrich.chat/naics/621111/illinois/)[NAICS 488510: Freight Transportation Arrangement](https://enrich.chat/naics/488510/illinois/)[NAICS 238220: Plumbing, Heating, and Air-Conditioning](https://enrich.chat/naics/238220/illinois/)[NAICS 236220: Commercial and Institutional Building](https://enrich.chat/naics/236220/illinois/) ## Frequently asked questions ### Which NAICS 621999 companies are in Illinois? The biggest by headcount range include Daniels Health, Howard Brown Health, Vitality Group, Paradigm Healthcare and Vitae Health Systems. The page lists 25 with links to their profiles where we have them. ### What is NAICS 621999? NAICS 621999 is the code for All Other Miscellaneous Ambulatory Health Care Services, in sector 62: Health Care and Social Assistance. ### Which cities in Illinois have the most? Chicago (36%), Evanston (5%) and Naperville (5%) lead among the companies counted. ## Try this prompt Find the people at NAICS 621999 companies in Illinois ```text Use www.enrich.chat to find the operations, IT and finance leaders at companies with NAICS code 621999 in Illinois, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [NAICS 621999 in California](https://enrich.chat/naics/621999/california/) - [NAICS 621999 in Texas](https://enrich.chat/naics/621999/texas/) - [NAICS 621999 in Florida](https://enrich.chat/naics/621999/florida/) - [NAICS 621999 in Colorado](https://enrich.chat/naics/621999/colorado/) - [NAICS 541511 in Illinois](https://enrich.chat/naics/541511/illinois/) - [NAICS 541512 in Illinois](https://enrich.chat/naics/541512/illinois/) - [NAICS 722511 in Illinois](https://enrich.chat/naics/722511/illinois/) - [NAICS 531210 in Illinois](https://enrich.chat/naics/531210/illinois/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)