Too sick to work? States must get their new Medicaid rules right.

The Billing Code Problem: How Medicaid Work Rules Leave Cancer Patients in Limbo

Provpnadvice.com – When Arkansas imposed its Medicaid work requirement in 2018, roughly 18,000 enrollees lost coverage within the first seven months — approximately one in four people subject to the mandate. A subsequent study published in the New England Journal of Medicine concluded that employment rates did not increase among those who kept their benefits. By early 2019, only about one in ten of the disenrolled had regained access. The state had built a system that punished people for failing to navigate bureaucratic paperwork, not for actually staying home from jobs they held.

That experiment was supposed to be a lesson. Yet as states now construct their own compliance architectures under a federal mandate, the same structural flaws are reappearing in new forms. Illinois, beginning January 1, 2027, will require every adult enrolled through its Medicaid expansion pathway to demonstrate either 80 hours of work in the preceding month or a qualifying medical condition that prevents employment. The state intends to adjudicate that second question primarily through billing codes — the alphanumeric strings generated each time a provider submits a claim for services rendered.

Where the Data Breaks Down

Congress wrote the work-requirement statute. Individual states retain discretion over operational details: which diagnoses qualify, how long a compliance window lasts, what documentation suffices. On July 30, a federal judge refused to issue a stay while a multistate legal challenge moves through the courts, meaning the implementation clock keeps running. States are already building their systems, and the choices made in administrative offices over the coming months will determine whether millions of low-income adults retain coverage or are swept out.

The federal statute carves out an exemption for individuals who are “medically frail” — a category designed to shield people whose conditions genuinely prevent them from working. Cancer treatment, for instance, can qualify. The difficulty is not defining the category in the abstract; it is identifying, from a claims file, who actually falls inside it at any given moment.

Billing codes function reasonably well for a patient already mid-chemotherapy. The oncologist bills, the pharmacy bills, the infusion center bills. A dense trail of codes confirms ongoing treatment. But the codes fail at both temporal boundaries of a cancer journey: before a diagnosis is confirmed and after treatment concludes while surveillance imaging continues.

The Weeks Between the Shadow and the Verdict

Consider a woman who receives an abnormal mammogram. The image shows something that warrants further investigation. Between that screening result and the pathology report that names a malignancy, she will undergo additional imaging, a tissue biopsy, and consultations with specialists. The cancer-specific billing code does not exist until the end of that sequence. Until pathology confirms the diagnosis, her record contains only fragments: a screening encounter, an abnormal finding, a follow-up order.

From her perspective, those weeks are not a waiting period for a code to populate. They are weeks of not knowing whether the shadow on the image is cancer. If her Medicaid renewal falls inside that interval, the system interprets the absence of a confirmed diagnosis as the absence of a serious condition. She holds no qualifying diagnosis. The record does not merely lag behind her illness — it governs her access to care before the illness exists on its own terms.

A Second Trap: The Separate-Category Wall

Illinois covers breast and cervical cancer treatment through a distinct Medicaid category. Yet the state’s own rules are explicit: individuals already eligible for Medicaid cannot receive benefits under that separate pathway. A woman enrolled through the expansion program does not migrate into the cancer-specific category when her biopsy returns positive. She remains in the expansion group, subject to the work requirement, through surgery, chemotherapy, and radiation. The exposure is therefore not a narrow gap of a few weeks before diagnosis. It is a standing condition that persists for the entire duration of treatment.

What States Could Do Differently

None of the protective measures outlined below would alter the federal requirement. All of them sit squarely within existing state authority.

States could shield patients from the moment an abnormal screening result is documented, so that no one is asked to prove illness during the weeks the claims record cannot yet demonstrate it. They could insert a grace period when a diagnosis is medically documented but the corresponding claim has not yet been processed. They could accept a physician’s letter from free or community clinics that do not bill Medicaid, ensuring the poorest patients are not rendered invisible by the absence of a billing trail. They could maintain coverage for survivors who remain under active surveillance monitoring.

The Centers for Medicare and Medicaid Services projects that 2.3 million people will lose Medicaid coverage in the first year of work-requirement implementation. No vote in Springfield will revisit the federal statute. But in the months ahead, state officials will decide which diagnoses count, when exemptions activate, and how much evidentiary burden patients must carry before the system accepts that they are sick.

Cancer doesn’t wait for a billing code to catch up. Neither should the states now deciding what counts as proof of illness.

The stakes are not hypothetical. They are already encoded in state administrative rules being finalized this year. The question for Illinois and every other state building its compliance framework is not whether the federal mandate permits flexibility — it does — but whether policymakers will place the burden of proof on the patient or on the system that is supposed to serve her.

Akshaya Sahasra Ganji is an undergraduate health policy researcher.