# Insurance Network Comparison: Which Insurer Has the Most Doctors in Each State? *We analyzed 12.1 million provider-insurer records across 61 insurers. Here is who leads in every state.* Source: https://ourhealthnetwork.com/insights/insurance-network-comparison-by-state Author: OurHealthNetwork Editorial Team Published: 2026-03-26 Last updated: 2026-03-26 Reading time: 8 minutes ## Summary A data-driven comparison of insurance network sizes across all 50 states and territories. Aetna leads 35 states, BCBS affiliates dominate their home turf, and Medicare fills the gaps in rural areas. ## Aetna, BCBS, Cigna, Medicare: We Analyzed 12.1 Million Coverage Entries to Find Which Insurer Has the Most Doctors in Every State When you pick a health insurance plan, one number matters more than any premium or deductible: how many doctors are actually in the network? A plan with lower monthly costs means nothing if the specialists you need are not covered. We pulled data from our database of 12.1 million provider-insurer coverage entries across 61 insurers to answer a simple question: which insurer gives you access to the most doctors, both nationally and in your state? The answer is not as straightforward as you might expect. One insurer leads in 35 of 56 states and territories. [Blue Cross Blue Shield](/insurance/blue-cross-blue-shield), which many people think of as a single company, is actually 50 independent affiliates that collectively cover the most providers but compete against each other in different regions. And in a handful of states, the leader changes completely. 61 Insurers Analyzed 1.9M Aetna Network (Top) 35 States Where Aetna Leads 50 BCBS Affiliates (Not One Co.) ## National Rankings: The Eight Largest Networks Across the entire country, [Aetna](/insurance/aetna) has the largest single-insurer network with 1,873,966 in-network providers. That count reflects Aetna's strategy of building one of the broadest national networks available, which accelerated after CVS Health acquired the company in 2018. [Medicare](/insurance/medicare) comes in second at 1,641,108. [Cigna](/insurance/cigna) follows closely with 1,585,596 providers. The rest of the top eight includes [UMR](/insurance/umr) (1,314,062), [UnitedHealthcare](/insurance/unitedhealthcare) (1,195,261), [Oxford](/insurance/oxford-health-plans-uhc) (991,574), and [Humana](/insurance/humana) (793,209). BCBS, when you combine all 50 affiliates, reaches 2,406,023 total providers, but no single BCBS affiliate comes close to Aetna's national reach. Top 8 Insurers by National Network Size (Providers) 0 500K 1.0M 1.5M 2.0M BCBS (combined) 2.41M Aetna 1.87M Medicare 1.64M Cigna 1.59M UMR 1.31M UnitedHealthcare 1.20M Oxford 992K Humana 793K Source: OurHealthNetwork analysis of 12.1M provider-insurer coverage entries (March 2026) One thing stands out in these numbers: the gap between first and second place. Aetna's network is 14% larger than Medicare's, and 18% larger than Cigna's. That margin is not small. For patients in states where Aetna leads, switching to a Cigna or Medicare Advantage plan could mean losing access to nearly 300,000 providers nationwide. ## Aetna's Dominance: 35 of 56 States and Territories 35 of 56 States and territories where Aetna has the largest provider network. In states like California (181K providers), New York (151K), and Florida (132K), no other single insurer comes close. Aetna's national footprint is the product of aggressive network-building that predates and continued after its 2018 acquisition by CVS Health. Aetna's lead is widest in large coastal states. In [California](/insurance/aetna/ca), Aetna covers 181,000 providers, 32,000 more than Medicare and 57,000 more than Cigna. In [New York](/insurance/aetna/ny), the margin over Cigna is 30,000 providers. In [Florida](/insurance/aetna/fl), Aetna leads Medicare by 22,000. This pattern holds in most mid-size states as well. Aetna leads in [Ohio](/insurance/aetna/oh) (82K), [New Jersey](/insurance/aetna/nj), [Virginia](/insurance/aetna/va), [Georgia](/insurance/aetna/ga), and [Arizona](/insurance/aetna/az). The consistency is striking. In state after state, Aetna's network is simply bigger than everyone else's. So why does Aetna win so many states? Three factors stand out. First, Aetna's commercial PPO network is among the oldest in the country, built over decades of employer-sponsored plan growth. Second, the CVS Health merger gave Aetna access to pharmacy benefit and retail clinic networks that incentivize broader provider participation. Third, Aetna has been aggressive about contracting with large health systems, which pulls in thousands of affiliated providers at once. ## Where Medicare Leads: Territories and Rural States Medicare tops the charts in 12 states and territories, and the pattern is clear: these are places where commercial insurance penetration is lower. U.S. territories like Puerto Rico, Guam, and the U.S. Virgin Islands rely heavily on [Medicare](/insurance/medicare) as the primary coverage pathway for providers. Rural states including West Virginia, Montana, and Wyoming also see Medicare as the largest network, because commercial insurers have less financial incentive to build broad networks in low-population areas. This makes sense. Medicare is not a commercial product competing for market share. It is a federal program that any licensed provider can choose to accept, and in areas where private insurance options are thin, most providers do. The result is that Medicare functions as the default network in places that commercial insurers often overlook. ## Where Cigna and BCBS Affiliates Lead [Cigna](/insurance/cigna) leads in 8 states, typically in the Mountain West and parts of the South. Cigna's strength in these states reflects its focus on self-insured employer plans administered through its Evernorth platform. In states with large employer bases and fewer dominant regional insurers, Cigna's national contracting approach gives it an edge. The BCBS story is more complicated and more interesting. “ Blue Cross Blue Shield is not one company. It is 50 independent organizations that license the Blue Cross and Blue Shield names and trademarks. Each affiliate sets its own provider contracts, negotiates its own rates, and builds its own network. Comparing "BCBS" to Aetna is like comparing 50 regional airlines to one national carrier. Source: [Blue Cross Blue Shield Association](https://www.bcbs.com/about-us) When you look at individual BCBS affiliates, some are the largest insurer in their home state by a wide margin. BCBS Texas leads in [Texas](/insurance/blue-cross-blue-shield) with 175,000 providers. BCBS Illinois dominates in [Illinois](/insurance/blue-cross-blue-shield) with 103,000. BCBS North Carolina leads in [North Carolina](/insurance/blue-cross-blue-shield) with 87,000. BCBS Michigan holds the top spot in [Michigan](/insurance/blue-cross-blue-shield) with 80,000. In [Pennsylvania](/insurance/blue-cross-blue-shield), Highmark BCBS sits in second place at 83,000, behind Aetna's 99,000. The BCBS affiliate model means that in some states, BCBS is the clear winner, while in others it barely registers because the local affiliate is small or focused on a narrow market segment. ## State-by-State Breakdown: The 10 Largest States The table below shows the top three insurers in each of the ten most-populated states. Several patterns jump out. In states where a BCBS affiliate is strong, it typically leads outright. In states without a dominant BCBS presence, Aetna almost always wins. State 1st Place Providers 2nd Place Providers 3rd Place Providers California [Aetna](/insurance/aetna/ca) 181K [Medicare](/insurance/medicare/ca) 149K [Cigna](/insurance/cigna/ca) 124K Texas [BCBS Texas](/insurance/blue-cross-blue-shield) 175K [Aetna](/insurance/aetna/tx) 150K [Cigna](/insurance/cigna/tx) 120K New York [Aetna](/insurance/aetna/ny) 151K [Cigna](/insurance/cigna/ny) 121K [Medicare](/insurance/medicare/ny) 115K Florida [Aetna](/insurance/aetna/fl) 132K [Medicare](/insurance/medicare/fl) 110K [Cigna](/insurance/cigna/fl) 109K Illinois [BCBS Illinois](/insurance/blue-cross-blue-shield) 103K [Aetna](/insurance/aetna/il) 86K [Cigna](/insurance/cigna/il) 68K Pennsylvania [Aetna](/insurance/aetna/pa) 99K Highmark BCBS 83K [Cigna](/insurance/cigna/pa) 81K North Carolina [BCBS NC](/insurance/blue-cross-blue-shield) 87K [Aetna](/insurance/aetna/nc) 80K [Cigna](/insurance/cigna/nc) 60K Ohio [Aetna](/insurance/aetna/oh) 82K [Cigna](/insurance/cigna/oh) 69K [Humana](/insurance/humana/oh) 66K Michigan [BCBS Michigan](/insurance/blue-cross-blue-shield) 80K [Medicare](/insurance/medicare/mi) 57K [UMR](/insurance/umr/mi) 41K Massachusetts [BCBS MA HMO](/insurance/blue-cross-blue-shield) 69K BCBS MA PPO 68K [Aetna](/insurance/aetna/ma) 67K Source: OurHealthNetwork analysis of provider-insurer coverage data, March 2026. Provider counts represent unique in-network practitioners per insurer per state. ## Massachusetts: The Most Competitive Insurance Market Massachusetts stands out as the tightest race in the country. The top three networks in [Massachusetts](/insurance/blue-cross-blue-shield) are separated by just 2,000 providers: BCBS Massachusetts HMO at 69,000, BCBS Massachusetts PPO at 68,000, and [Aetna](/insurance/aetna/ma) at 67,000. No other state has a margin that narrow among its top three insurers. This level of competition is not accidental. Massachusetts was the first state to implement an individual health insurance mandate in 2006, years before the [Affordable Care Act](https://www.healthcare.gov/glossary/affordable-care-act/). That mandate, combined with strict state regulations requiring broad network adequacy, pushed every insurer to contract with as many providers as possible. The result is a market where switching insurers has a smaller impact on provider access than almost anywhere else in the country. For patients in Massachusetts, this is good news. It means the choice between BCBS and Aetna comes down to premiums, copay structures, and specific specialist availability, not broad network size. That is a luxury most states do not have. ## Washington State: Where a Regional Player Wins Washington is another outlier. In most states, national insurers or dominant BCBS affiliates lead the rankings. In Washington, Premera Blue Cross, a BCBS affiliate that operates primarily in the Pacific Northwest, holds the top position. Premera is not a name most Americans would recognize, but in Washington and Alaska, it is the largest insurer by network size. This pattern shows up in a handful of other states too. Regional insurers with deep local relationships can build networks that national carriers struggle to match, especially in states with strong independent medical groups that prefer to contract with local plans. The lesson for consumers is clear: do not assume that a nationally known brand automatically means a larger local network. ## What This Means for Patients Choosing a Plan These rankings measure one thing: how many providers have contracted with each insurer. They do not tell you whether your specific doctor accepts the plan, whether the plan covers your preferred hospital, or how much you will pay out of pocket. A network with 181,000 providers in California is not helpful if the one cardiologist your condition requires is out of network. That said, network size is a reasonable proxy for flexibility. Larger networks give you more choices when you need a referral, when you move to a new city, or when your current doctor retires. If you travel frequently or have family members in different states, an insurer with a strong national network (Aetna, Cigna, or UnitedHealthcare) may serve you better than a regional BCBS affiliate with deep coverage in one state but thin coverage elsewhere. If you are comparing plans during open enrollment, start with network size as a baseline, then narrow your choice by checking specific providers. The difference between an 80,000-provider network and a 130,000-provider network in your state is real and affects your options. Here is what we recommend: - **Check your state first.** National rankings do not apply everywhere. If you live in Texas, Illinois, North Carolina, or Michigan, a BCBS affiliate may have a larger local network than Aetna. - **Verify your doctors.** Use our [insurance search tool](/insurance) to check whether specific providers accept your plan before you enroll. - **Compare plan types within an insurer.** Massachusetts shows that a single insurer can offer both HMO and PPO networks with different provider counts. The plan type matters as much as the brand name. - **Consider Medicare if you qualify.** In rural states and territories, Medicare may offer broader provider access than any commercial plan. ## Methodology and Data Sources This analysis is based on 12.1 million provider-insurer coverage entries in the OurHealthNetwork database, covering 61 distinct insurers. Provider counts represent unique practitioners (identified by NPI number) listed as in-network for each insurer in each state. Data sources include the [CMS Provider Data Catalog](https://data.cms.gov/), insurer transparency-in-coverage machine-readable files, and FHIR provider data feeds. BCBS affiliate counts are reported separately by affiliate because each organization maintains its own provider contracts. The combined BCBS figure (2,406,023) sums all 50 affiliates and may include providers counted by more than one affiliate in overlapping service areas. State counts include all 50 states, the District of Columbia, and 5 U.S. territories (Puerto Rico, Guam, U.S. Virgin Islands, American Samoa, and Northern Mariana Islands), for a total of 56 jurisdictions. "Leader" status is determined by the insurer with the highest unique provider count within each jurisdiction. ## Tags insurance networks, health insurance, Aetna, BCBS, Cigna, Medicare, healthcare data ## Related articles on OurHealthNetwork - https://ourhealthnetwork.com/insights/gender-gap-medicine-specialties - https://ourhealthnetwork.com/insights/medical-school-rankings-active-practitioners ## About this article This article is part of OurHealthNetwork's insights collection. We are an independent healthcare data platform aggregating federal datasets (CMS, FDA, CDC) to inform patients and caregivers. See https://ourhealthnetwork.com/methodology for our editorial approach and https://ourhealthnetwork.com/data-sources for source datasets.