The One Big Beautiful Bill Act, signed in 2025, requires states to redetermine Medicaid eligibility for expansion adults aged 19 to 64 every 6 months instead of annually, beginning with redeterminations scheduled on or after the first day of the first quarter that begins after December 31, 2026. CMS issued implementation guidance to states in early 2026. Combined with the 25 million-plus disenrollments already recorded during the 2023 to 2025 unwinding, the change creates a workflow problem most practices have not had to solve at scale: patients will move in and out of Medicaid coverage every six months, sometimes mid-treatment, and claims tied to lapsed coverage will start denying in volume.
What OBBBA actually changed
Before OBBBA, federal rules let states renew Medicaid eligibility annually, and many states relied on automated ex parte renewals that confirmed coverage from existing data sources without requiring a patient response. The new law cuts the redetermination cycle to six months for the expansion population, and CMS guidance clarifies that the six-month requirement applies even when a state would prefer to keep the annual cadence. States must also send notices, allow appeal windows, and process responses within fixed timelines. Practices need to know two dates per Medicaid patient: when the most recent redetermination closed, and when the next one is due.
Why the existing eligibility workflow breaks
Most practices verify eligibility once at the time of scheduling and again at the date of service. Under a six-month cycle, that is not enough. A patient with an appointment in late October could verify eligible at scheduling in early September, lapse during a redetermination cycle in mid-October, and arrive on the date of service technically uninsured without anyone in the practice noticing. The claim denies under CARC 27 (expenses incurred after coverage terminated) or CARC 31 (patient cannot be identified as our insured), and the practice has already provided care.
Building a recurring eligibility cadence
The fix is a recurring eligibility check, not a one-time check. Practices that handle a high Medicaid volume should build the following workflow:
- Run a 270/271 batch eligibility check on all Medicaid patients 14 days before any scheduled appointment, plus a same-day check.
- Tag every Medicaid patient record with the next expected redetermination date based on the state’s published cadence.
- Trigger a patient outreach 30 days before redetermination to remind them to respond to state mail and complete required paperwork.
- For patients in active treatment plans (chemotherapy, behavioral health, dialysis, prenatal care), assign a dedicated staff member to track each redetermination and intervene when paperwork is missing.
The mid-treatment coverage transition
The hardest cases are patients who lose Medicaid mid-treatment and either become uninsured, transition to a marketplace plan, or pick up employer coverage. Each path has different billing implications. Uninsured patients move into self-pay workflows and need a financial counseling conversation before the next service. Marketplace enrollees may have a brand new plan, deductible, and network status that requires re-verification and possibly re-credentialing. Employer plan transitions often introduce new prior authorization requirements for medications and procedures already in progress. Practices that treat these as routine eligibility events, rather than billing crises, recover most of the revenue.
State-level variations practices need to track
OBBBA sets the federal floor, but states implement on different timelines and with different paperwork requirements. Some states will run the six-month cycle as two synchronized batches per year. Others will spread redeterminations evenly across each month. Some will rely heavily on automated ex parte renewals; others will require active patient response for every cycle. Multi-state practices must build a state-by-state cadence map, ideally maintained in the same system that handles eligibility verification. The penalty for assuming a uniform federal cadence is silent denials in states that handle it differently.
Documentation and patient notice
Practices that document eligibility checks at every step have a defensible audit trail when CMS or a state Medicaid integrity contractor reviews claims later. The minimum: timestamp of the eligibility transaction, the response code, the staff member who ran it, and any patient communication tied to the check. For patients who lose coverage, a written notice of the transition (with the financial implications) protects against later disputes and bad-debt write-offs that should have been managed proactively.
How MHB helps practices manage Medicaid churn
For practices that want recurring batch eligibility checks, redetermination tracking, and state-by-state cadence built into their existing systems, our team handles end-to-end insurance verification with Medicaid-specific workflow, daily eligibility runs on active patient panels, and patient-outreach support for upcoming redeterminations. The work runs in the practice’s PMS or EHR, with no setup fees.
The bottom line
The 6-month cycle is not a minor administrative tweak. It changes how often eligibility must be verified, how often patient communication must happen, and how often claims will deny on coverage that lapsed without anyone noticing. Practices that build the workflow before Q1 2027 absorb the change. Practices that wait will spend the next two years writing off the difference.
