Medical Mutual of Ohio Market Analysis: Market Share and Coverage by State

Payer Overview

Medical Mutual of Ohio is the #48 largest US A&H payer by reported premium, writing $3.62B in the US market with a US market share of 0.25% across 10 states. The company reports an estimated total membership of 493.7K and operates through 6 affiliated subsidiaries, concentrating most of its activity in a single Midwestern state while maintaining small footprints elsewhere.

The payer's national footprint is focused on the continental United States with no reported US territory or foreign premium. This concentrated premium base and membership profile inform how Medical Mutual of Ohio approaches provider contracting: deep networks and negotiation leverage in core markets, coupled with localized, relationship-driven contracting in peripheral states.

Premium by Scope

Medical Mutual of Ohio's premium footprint is exclusively in the US states and DC scope as reported. The payer writes $3.62B in the US scope, representing 100.00% of its reported premium across the scopes provided. For a provider evaluating this payer, this concentration implies contracting and network strategies should prioritize US state operations, particularly the issuer's primary state-level markets, since there is no material territory or foreign exposure to consider.

Medical Mutual of Ohio's premium is highly concentrated in Ohio, which accounts for the vast majority of writing while the remaining states each represent only small pockets of exposure. The firm's national premium position is therefore driven by a single core market rather than a broadly diversified national book, which means provider contracting leverage will be strongest in Ohio and comparatively limited in peripheral states. For national provider groups, network inclusion and rate negotiations should prioritize Ohio where scale is meaningful; outside Ohio, agreements will likely be negotiated at a local or regional level with limited cross-state leverage.

State-by-State Market Position

Medical Mutual of Ohio shows its strongest presence in the Midwest, led overwhelmingly by Ohio where it holds its top-ranked position. The Southeast and portions of the Upper Midwest contain small footholds (Georgia, South Carolina, North Carolina, Kentucky), but share and premium there are minimal relative to Ohio. The West and Southwest show only token exposure via Arizona.

The Affordable Care Act (ACA) established federally-facilitated health insurance marketplaces ("exchanges") where individuals and small businesses can shop for and enroll in health plans, often with income-based subsidies. Issuers that participate in these marketplaces are required to report enrollment, claims, and denial data to CMS (Centers for Medicare & Medicaid Services) each year.

The sections below cover this payer's ACA marketplace-specific footprint — enrollment, plan portfolio, and claims/denial-rate data. This is a narrower, separate population from the NAIC-based commercial data shown earlier on this page (total premium, market share, and membership across all lines of business): ACA marketplace enrollment is typically a small fraction of a payer's total commercial book, and the two datasets should not be treated as equivalent. CMS claims-transparency reporting has also been inconsistent industry-wide since 2020 — many issuers have little or no data for 2021 onward, so a single reporting year is common and does not necessarily indicate anything about the payer's current ACA presence.

Estimated Member Demographics

Nationally, the largest age bands are 6–18 (78,644 members), 55–64 (72,418 members), and 45–54 (67,691 members), indicating a strong presence among children and pre-retirement adults. Ohio dominates the member count, with nearly all age bands showing significantly higher numbers than other states. The smallest age bands are 65–74 and 75+, reflecting a lower senior population compared to working-age and pediatric groups.

State-level variation is minimal, with Ohio accounting for the vast majority of members in every age band. Other states have much smaller member counts, and no state shows a pronounced skew toward older or younger populations relative to the national profile. This suggests a consistent demographic mix across the payer's footprint, with Ohio as the primary driver of overall member demographics.