By Lilit Muradyan, Billing Department, WCH
Plan exits and network changes can create new credentialing, eligibility, authorization, and billing risks for medical practices.
In early October, roughly 600,000 Humana Medicare Advantage members are expected to learn that their current coverage will change for 2027. Humana has said the changes to its 2027 MA portfolio will affect approximately that many members, as the company moves away from plans and markets it considers less sustainable. The company also expects to keep close to 40% of those members inside its own portfolio by moving them to other Humana plans. The rest will be shopping for new coverage whether they meant to or not.
And Humana isn’t the only plan making changes for 2027. Across the market, insurers are reassessing products, networks, and geographies as they adjust to the economics of the program — CMS’s final 2027 payment rule provides a modest average rate increase, against which plans are making their own decisions about products, markets, and networks. CMS’s annual Medicare Advantage and Part D Landscape files, published each fall, will provide the fuller picture of exactly which plans are available where for 2027.
This kind of disruption isn’t new, either. A Johns Hopkins study published in JAMA Health Forum estimated that roughly 2.9 million MA enrollees were affected by plan exits or contract changes heading into 2026 — about 10% of the MA population, and well above historical levels.
Here’s the thing: almost every article written about this cycle is written for the patient. Is my plan getting cut? What are my options? Should I look at Medigap? Good questions — for the person holding the letter.
If you run a practice, the letter isn’t really about you. But what happens next absolutely is. The real question isn’t how many plans are leaving. It’s this: what happens when your patient walks back in on January 5th with a different insurance card in hand — and nobody on your team notices until the claim bounces?
A patient sees “Medicare Advantage” and assumes continuity. Same benefit, same doctor, same deal. But from where you sit, “Medicare Advantage” was never one payer — it’s a market made up of dozens of individual plans and products, each with its own network, contract terms, authorization rules, and claims requirements. When a patient’s plan changes, that can touch several separate parts of your operation at once: eligibility, network status, credentialing, authorization, and billing rules. Not every plan change triggers all five — but any one of them showing up unnoticed is enough to cause a denial.
None of that shows up in the non-renewal letter. It shows up in your AR aging report six weeks later.
Why one plan change can touch several parts of your operation
| What changes | What it can quietly mean for your practice |
| Patient switches MA plans | Eligibility has to be re-verified — the old card is no longer good information |
| New plan/network relationship | Credentialing, contracting, or enrollment requirements may apply |
| New plan’s rules | Prior authorization requirements can be completely different from last year’s |
| Different payer policies | Coding and claim submission requirements may not match what you did in 2026 |
| Network termination | Patients may need to find another participating provider |
| New coverage, no verification | Claims submitted under old assumptions start denying |
The pattern underneath all of it: a patient’s insurance decision can quietly become your revenue-cycle problem, and it usually surfaces weeks after the fact, disguised as a routine denial.
Four Things Worth Checking Before 2027 Begins
1. Eligibility. Don’t assume a patient you’ve seen for years is still covered exactly the way they were. Verify the specific plan, the payer behind it, the network, referral requirements, and the effective date — especially for anyone whose plan is one of the ones in flux this fall.
2. Network participation and contracts. This is where practices can get caught off guard. Being contracted with an insurer doesn’t mean you’re contracted with every plan that insurer sells. CMS also provides Special Enrollment Periods in certain circumstances involving changes to a plan’s provider network — which makes network status a genuinely live issue heading into 2027, not a formality to check once a year. Verify the specific plan and network, not just the carrier name.
3. Credentialing. Credentialing, contracting, and network participation are three separate questions, and it’s easy to assume one covers the others. A provider can be fully credentialed with a carrier and still not be participating in a particular MA product or network. When a patient’s plan changes underneath them, check the specific payer, product, network, location, and effective date — not just the name printed on the card.
4. Prior authorization and referrals. A new plan can mean an entirely different utilization-management process — different submission portal, different documentation standard, different turnaround time. Carrying 2026 authorization rules into 2027 without checking is a predictable source of avoidable denials in Q1.
Where the Cost Actually Shows Up
Here’s what makes this cycle sneaky: the financial hit doesn’t land on January 1. It shows up weeks later, as a wave of denials that all trace back to the same root cause — eligibility that wasn’t reverified, a network assumption that turned out to be wrong, an authorization that was submitted the old way. By the time someone connects the dots, you’re looking at delayed cash flow, staff hours spent on rework, and a backlog that didn’t need to exist.
| A short checklist before the first 2027 claims go out Before 2027 begins, it’s worth walking through: Which MA plans in your area are exiting, restructuring, or changing networks How many of your patients are on those plans Whether your contracts and participation status still match reality, plan by plan Whether credentialing or enrollment gaps exist for any new plan relationships Eligibility for every patient whose plan is changing Current authorization and referral requirements, plan by plan Whether billing workflows need updating for new payer rules Early 2027 denials, watched closely for transition-related patterns Turn 2027 MA changes into a readiness project, not a January surprise |
None of this has to become a crisis that hits your front desk in the second week of January. The practices that navigate this cycle most cleanly will be the ones that treat it as a readiness project now — reviewing payer relationships, confirming credentialing and enrollment status, and stress-testing billing workflows before the first denial ever shows up.
That’s exactly the kind of work WCH does every day: payer enrollment and credentialing, contract support, eligibility and billing workflow review, claims and denial analysis, and ongoing revenue-cycle management. If you’d rather find out about a network gap in October than discover it in a denial in February, that’s a conversation worth having now — while there’s still time to do something about it.
Sources
- Centers for Medicare & Medicaid Services (CMS.gov) — CY 2027 Medicare Advantage and Part D Final Rate Announcement
- Centers for Medicare & Medicaid Services (CMS.gov) — 2027 Medicare Advantage and Part D Landscape files
- Humana — statements on 2027 Medicare Advantage portfolio and market changes
- Johns Hopkins Bloomberg School of Public Health / JAMA Health Forum — study on MA plan disruption heading into 2026
- Becker’s Payer Issues, “Humana to exit Medicare Advantage plans covering 600,000 members in 2027,” July 2026
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