Updated November 2026 for the 2027 plan year. This page lists the health insurance companies selling coverage in Ohio: the insurers on the ACA Marketplace, the companies with the largest share of the commercial market, the Medicaid managed care plans and the leading Medicare Advantage carriers. Elevance Health (Anthem BCBS) is the largest commercial health insurer in Ohio, with 36% of the market, according to the American Medical Association (AMA).
For coverage you buy yourself, Ohio residents use HealthCare.gov. For 2027, 8 insurers are expected to offer Marketplace plans there, based on federal and state filings.
Ohio Health Insurance at a Glance
| Measure | Ohio | Source |
|---|---|---|
| Largest commercial insurer (share of market) | Elevance Health (Anthem BCBS) (36%) | AMA, 2024 data |
| Second-largest commercial insurer | Medical Mutual (19%) | AMA, 2024 data |
| ACA Marketplace | HealthCare.gov | |
| Marketplace plan selections, 2026 | 469,616 (-19.5% from 2025) | CMS |
| Average monthly Marketplace premium after tax credits | $233 in 2026 ($126 in 2025) | CMS |
| Medicaid enrollees, 2024 | 3,018,792 | CMS |
| Share of Medicaid enrollees in comprehensive managed care | 90.1% | CMS, 2024 |
| Medicare Advantage plans, 2027 | 180 (212 in 2026) | CMS |
| Largest Medicare Advantage carrier | UnitedHealth Group (23%) | AMA, 2024 data |
Largest Health Insurance Companies in Ohio
The AMA’s annual Competition in Health Insurance report measures each insurer’s share of enrollment in the commercial market, which includes employer plans and individual coverage, and in Medicare Advantage. The latest edition uses enrollment as of January 1, 2024.
| Market | Largest insurer | Share | Second-largest insurer | Share |
|---|---|---|---|---|
| Commercial (employer and individual) | Elevance Health (Anthem BCBS) | 36% | Medical Mutual | 19% |
| Medicare Advantage | UnitedHealth Group | 23% | Elevance Health | 23% |
The Blue Cross Blue Shield licensee in Ohio: Anthem Blue Cross and Blue Shield (Elevance Health). For every company, including national carriers, see our List of Health Insurance Companies.
ACA Marketplace Insurers in Ohio for 2026 and 2027
| Insurer | 2026 | 2027 |
|---|---|---|
| Ambetter from Buckeye Health Plan | Yes | Yes |
| AmeriHealth Caritas Next | No | Yes |
| Anthem Blue Cross and Blue Shield | Yes | Yes |
| Antidote Health Plan of Ohio | Yes | Yes |
| CareSource | Yes | No |
| MedMutual | Yes | Yes |
| Molina Healthcare | Yes | No |
| Oscar Health | Yes | Yes |
| Paramount | Yes | No |
| SummaCare | Yes | Yes |
| UnitedHealthcare | Yes | Yes |
CareSource and Molina are leaving the Ohio Marketplace for 2027, affecting about 54,000 enrollees, according to the Ohio Department of Insurance; their Medicaid plans are not affected. AmeriHealth Caritas is new for 2027.
Source: CMS Marketplace plan data files. Insurer names are brand names; an insurer may sell in only part of the state. Check plans for your ZIP code at HealthCare.gov.
Claim Denial Rates for Ohio Marketplace Insurers
In 2024, Ohio HealthCare.gov insurers denied 17.9% of in-network claims, compared with 18.7% nationally. Rates by insurer:
| Insurer (as filed) | In-Network Claims | In-Network Denial Rate |
|---|---|---|
| Buckeye Community Health Plan | 3,673,782 | 19.5% |
| Community Insurance Company(Anthem BCBS) | 3,535,080 | 8.3% |
| CareSource Ohio, Inc. | 2,814,185 | 20.0% |
| Molina Healthcare of Ohio, Inc. | 1,975,213 | 21.7% |
| Medical Health Insuring Corp. of Ohio | 1,320,144 | 15.1% |
| Oscar Buckeye State Insurance Corp. | 1,276,642 | 26.5% |
| UnitedHealthcare of Ohio, Inc. | 895,840 | 23.2% |
| Oscar Insurance Corporation of Ohio | 610,423 | 19.9% |
| Summa Insurance Company, Inc. | 197,767 | 26.1% |
| Paramount Insurance Company | 110,549 | 14.2% |
Full methodology and national rankings are in our claim denial rates by insurer report.
Medicaid Managed Care Plans in Ohio
Ohio Department of Medicaid (ODM) runs Medicaid in Ohio. In 2024, 90.1% of the state’s 3,018,792 Medicaid enrollees were in comprehensive managed care plans, according to CMS; see our Medicaid managed care by state data. Programs: Next Generation Medicaid managed care (launched Feb. 1, 2023); OhioRISE (youth behavioral health; Aetna Better Health of Ohio); Single Pharmacy Benefit Manager (Gainwell Technologies); Next Generation MyCare Ohio (dual eligibles; transition beginning Jan. 2026).
- AmeriHealth Caritas Ohio
- Anthem Blue Cross and Blue Shield
- Buckeye Health Plan
- CareSource
- Humana Healthy Horizons in Ohio
- Molina Healthcare of Ohio
- UnitedHealthcare Community Plan of Ohio
Source: Ohio Department of Medicaid (ODM).
Medicare Advantage in Ohio
People with Medicare in Ohio can choose from 180 Medicare Advantage plans for 2027, compared with 212 in 2026, and 100% have access to a plan with a $0 monthly premium, according to CMS. The largest Medicare Advantage carriers are UnitedHealth Group (23%) and Elevance Health (23%), according to the AMA. Compare every state on our Medicare Advantage plans by state page, and see our Medigap vs Medicare Advantage guide before you choose.
Recent Developments in Ohio
- CareSource and Molina will not offer Ohio Marketplace plans in 2027 (about 54,000 combined enrollees per ODI); CareSource’s Medicaid and MyCare plans are unaffected. (source)
- AmeriHealth Caritas enters the Ohio Marketplace for 2027. (source)
- Ohio Medicaid selected Anthem, Buckeye, CareSource and Molina (Nov. 1, 2024) for Next Generation MyCare Ohio, with the transition beginning January 2026. (source)
How To Choose a Health Insurer in Ohio
- Compare Marketplace plans for your ZIP code and update your income to get the right tax credit.
- Check that your doctors and hospitals are in network; our HMO vs PPO vs EPO guide explains the differences.
- Compare the out-of-pocket maximum as well as the premium.
- If your insurer is leaving the Marketplace for 2027, choose a new plan by December 15 for coverage starting January 1.
- For complaints or help with a denied claim, contact the Ohio Department of Insurance.
For statewide enrollment and premium trends, see our ACA Marketplace enrollment by state data, and follow our Health Insurance Companies hub for insurer news.
Sources
American Medical Association, Competition in Health Insurance: A Comprehensive Study of U.S. Markets (2025 update, 2024 data); CMS 2026 and 2025 Open Enrollment State-Level Public Use Files; CMS Marketplace plan data files for 2026 and 2027; CMS Medicaid Managed Care Enrollment (2024); CMS 2027 Medicare Advantage and Part D state fact sheets; KFF 2024 Transparency in Coverage data; Ohio Department of Medicaid (ODM).