Network Adequacy vs. Network Access: Understanding the Difference

Two Standards, Two Problems

Network adequacy and network access are both CMS requirements for Medicare Advantage plans, and both ultimately aim to ensure members can get the care they need. But they measure fundamentally different things, and a plan can fail one while passing the other.

Understanding the distinction isn't just semantic — it shapes how you design your network, what data you collect, and how you respond when CMS identifies a problem.

What Network Adequacy Measures

Network adequacy is a quantitative, geography-based standard. It asks: for each county in your service area, do you have enough contracted providers of each type within the required time and distance thresholds?

CMS evaluates adequacy using its standardized time-and-distance methodology, which calculates the drive time and straight-line distance from the geographic centroid of each county to the nearest contracted provider in each specialty category. If you clear the threshold, you pass. If you don't, you need an exception filing or additional contracted providers.

• Adequacy is measured at the county level, not the member level
• It uses straight-line or drive-time distances, not appointment availability
• A provider counts toward adequacy if they are contracted — regardless of whether they are accepting new patients
• CMS publishes thresholds in its annual MA Network Adequacy Criteria guidance

What Network Access Measures

Access is about whether members can actually obtain an appointment with a contracted provider in a reasonable timeframe. CMS's timely access standards, established in the 2024 final rule, require MA plans to ensure members can get appointments within specific windows:

• Urgent care: within 24 hours
• Non-urgent primary care: within 10 business days
• Non-urgent specialty care: within 15 business days
• Mental health: same standards as physical health under parity requirements

Access is measured through member experience data, secret shopper surveys, and provider directory accuracy audits. A plan can have a "passing" adequacy filing and still fail access standards if contracted providers aren't accepting new patients or have scheduling backlogs that exceed the access windows.

How a Network Can Be Adequate But Inaccessible

This scenario is more common than most plan executives realize. A plan contracts with every cardiologist in a three-county service area — it passes adequacy on paper. But two of those cardiologists have 6-month new patient waits, and the third only accepts referrals from a specific PCP group. Members with cardiac conditions can't actually get timely care.

CMS has increasingly focused on this gap. The 2024 access standards rule was specifically designed to address adequacy "gaming" — situations where plans built technically compliant networks that weren't functionally accessible.

How to Measure and Monitor Both

Best-practice network ops teams track both dimensions on a rolling basis:

• Run monthly adequacy models against current contracted provider rosters
• Conduct quarterly provider directory accuracy audits — call contracted providers to verify they are accepting new patients and taking your plan
• Monitor member complaints about appointment access by county and specialty — these are early warning signals of access failures before they become CMS audit findings
• Track referral completion rates in your utilization data — high specialist referral abandonment rates suggest access barriers

Plans that proactively monitor access — not just adequacy — are better positioned to pass CMS audits, maintain member satisfaction, and avoid the corrective action plans that consume disproportionate staff time and regulatory goodwill.