Case Study 2 — Medicaid Unwinding: What Happens When Eligibility Stops Being Automatic

A real, documented policy event with an enormous operational footprint. Tier 1 for the statutory and regulatory framework; qualitative for magnitudes, which varied by state and should be verified against current CMS and state data.

Background

Section 3.7 made a small, practical claim that sounds like housekeeping: verify Medicaid eligibility at every visit, without exception, because eligibility churns monthly.

There is a specific recent event that turned that housekeeping instruction into one of the largest coverage disruptions in the modern history of the program, and it is worth studying because it demonstrates — at national scale, in a compressed window — exactly what the failure mode looks like.

Medicaid eligibility is normally redetermined periodically, typically annually. A state verifies that an enrollee still meets income and category requirements. If the enrollee's circumstances have changed, or — far more commonly — if paperwork is not returned to an outdated address, coverage ends. The enrollee frequently does not find out until they present for care.

During the COVID-19 public health emergency, the Families First Coronavirus Response Act of 2020 gave states enhanced federal matching funds on the condition that they maintain continuous enrollment: with narrow exceptions, states could not disenroll people from Medicaid for the duration of the emergency. Redeterminations effectively stopped. Enrollment grew substantially and steadily over roughly three years.

The Consolidated Appropriations Act, 2023 decoupled the continuous enrollment condition from the public health emergency and set a date — March 31, 2023 — after which states could resume disenrollments, with the enhanced federal match phasing down over the following months. States began processing a backlog of redeterminations that had accumulated for three years.

This is what came to be called the unwinding.

The issue

The scale was unprecedented and the mechanics were ordinary, which is the whole lesson. Every state had to redetermine eligibility for its entire Medicaid population over a period of roughly twelve to fourteen months, on a schedule each state set for itself.

Four features of that process mattered operationally, and every one of them landed in somebody's revenue cycle.

1. A large share of disenrollments were procedural rather than substantive. CMS reporting during the unwinding period consistently showed that a majority of disenrollments in many states were for procedural reasons — a form not returned, an address out of date, a renewal packet not received — rather than a determination that the person was actually ineligible. This is the ordinary Medicaid failure mode, occurring all at once.

2. States varied enormously. Timeline, outreach intensity, use of ex parte renewal (automatically renewing coverage using data the state already has, without requiring the enrollee to act), call center capacity, and procedural disenrollment rates all differed by state, sometimes by a very wide margin. CMS intervened with several states over specific compliance problems, including a widely reported issue in which some states had been conducting ex parte renewals at the household rather than the individual level, improperly disenrolling children who remained eligible even where an adult in the household was not.

3. Coverage frequently ended without the enrollee knowing. The card in the wallet did not change. The most common way people learned they had lost coverage was at a point of service — a pharmacy counter, a clinic front desk, a hospital registration window.

4. Some of it was reversible. Many states permit retroactive reinstatement when a redetermination is completed within a defined window after a procedural termination, and CMS pushed states toward mitigation strategies. The practical consequence for a provider is that a patient who appears uninsured on Tuesday may be retroactively covered for that Tuesday if they complete their paperwork in time — which means the worst thing a business office can do is immediately convert the balance to self-pay and start collections.

What it shows

First, it validates §3.7's instruction in the strongest possible terms. A practice checking eligibility monthly rather than per-visit, or trusting a card, or trusting the last verified status, would have accumulated uncollectible balances continuously through the unwinding period without understanding why. The verification is not a formality. It is the only mechanism that surfaces a change that is otherwise completely invisible.

Second, it shows that the front desk is a clinical access point, not just an administrative one. A patient told at the window that their coverage is inactive makes a decision in the next thirty seconds about whether to be seen. What the front desk says — and whether it knows that reinstatement is often possible — has consequences beyond the account.

Third, it demonstrates the operational value of knowing a program's mechanics rather than its rules. The rule ("Medicaid covers low-income people") explains nothing about what happened. The mechanic — periodic redetermination, paperwork-driven, address-dependent, with a retroactive reinstatement window — explains all of it, and predicts the same failure in any month of any year at a lower rate.

Fourth, it is a clean illustration of why "Medicaid" is not one payer. Two neighboring states running the same federal program produced materially different disenrollment outcomes over the same period, driven by administrative choices — how aggressively to use ex parte renewal, how much call center capacity to fund, how to sequence the population. A biller who moved between those two states would have experienced two different jobs.

And fifth — the point most relevant to the reader's daily work — it shows that a coverage problem and a billing problem can look identical and require opposite responses. A denial for "coverage terminated" from a commercial payer usually means what it says. The same denial during an unwinding period frequently meant "this person is eligible and did not return a form," and the correct response was not to bill the patient. It was to tell them how to get reinstated.

Outcome

The unwinding proceeded across states through 2023 and 2024. Enrollment declined substantially from its peak. CMS required states to report disenrollment data monthly, published it, intervened with states whose procedural disenrollment rates or call center performance indicated compliance problems, and offered a menu of mitigation strategies — extended reconsideration periods, expanded ex parte renewal, permitting managed care plans and providers to assist with renewals.

For exact enrollment figures, disenrollment counts, procedural termination rates, and state-level detail, consult CMS's published unwinding data and current KFF tracking. They are specific, public, and this book deliberately does not reproduce them, because a static number in a textbook about a moving event is worse than a pointer.

The structural lesson outlasted the event: eligibility verification at the point of service, and the knowledge that a procedural termination is often reversible, are permanent competencies rather than crisis measures.

The lesson

Verify eligibility on the date of service, every visit, and never treat "coverage terminated" as the end of the inquiry.

Three habits follow:

Ask why, not just whether. A terminated Medicaid coverage is a different problem from a terminated commercial policy. One frequently has a remedy the patient does not know about.

Do not convert a Medicaid balance to self-pay reflexively. Where retroactive reinstatement is possible, an immediate transfer to patient responsibility creates a balance that may never have been owed, generates a statement, and starts a relationship with the patient on a false premise. Hold the account, tell the patient what to do, and set a follow-up.

Know your state's specifics — the reconsideration window, whether your state uses ex parte renewal, and the phone number the patient needs. That information is not general knowledge; it is local knowledge, and it is the difference between a front desk that solves a problem and one that creates a bad debt.

The unwinding was a defined, time-limited event, but the mechanics it exposed — periodic redetermination, procedural termination, retroactive reinstatement — are permanent features of Medicaid. Verify your state's current rules with the state Medicaid agency.

Discussion questions

1. §3.7 said Medicaid is "fifty programs, one name." Name three specific administrative choices described in this case study that differed between states, and say which one you think mattered most to a patient.

2. A patient's Medicaid coverage shows inactive at the window. Write the decision tree the front desk should follow, from that moment to the patient either being seen or leaving. Where does the financial conversation belong in it, and where does it definitely not belong?

3. This case study and Chapter 2's Case Study 1 (high-deductible plans) both describe cost shifting to the patient. Compare them: which is more visible to the patient in advance, which is more reversible, and which is more likely to produce an uncollectible balance?

4. The chapter says Medicaid is the payer of last resort. During the unwinding, some patients lost Medicaid but had another coverage source they did not know about — a marketplace plan they were eligible for, or employer coverage. What would a genuinely helpful business office do with that fact, and where is the line between helping and giving advice you are not qualified to give?

5. Construct the argument that a provider organization has a financial interest, not merely a humanitarian one, in helping patients maintain Medicaid enrollment. Then identify the point at which that argument would stop being persuasive to a CFO.