Indiana Flooding 2026: What Healthcare Providers Need to Recognize and Prepare for After the Floods

If you practice anywhere in central or southern Indiana, the past two weeks have not been a normal stretch. What started as severe thunderstorms and a derecho on August 11, 2026 turned into some of the most significant flooding the state has seen in over a century, with rivers cresting past benchmarks set by the Great Flood of 1913. For healthcare providers, that means two things at once, a real shift in what's walking through your door clinically, and a real shift in how care gets delivered and billed while roads, bridges, and power infrastructure are still being repaired.

This article covers both halves of that picture. First, the specific post-flood health risks Indiana providers should have on their radar in the weeks following this event, tailored to the realities of inland river flooding rather than a generic checklist. Second, what actually changes operationally, for patient access and for Medicare billing, once a disaster declaration like this one is in place.

What Happened in Indiana in August 2026

It's worth being precise about the scope of this event, since the numbers involved are genuinely unusual for the state.

1. Severe storms, a confirmed derecho, and at least two tornadoes struck Indiana beginning August 11, 2026, followed by repeated rounds of heavy, stalled rainfall.
2. Some areas of the state saw 6 to 9 inches of rain within a short period, with additional rainfall in the days that followed.
3. Multiple major rivers, including the White River, the Wabash River, the East Fork White River, and the Whitewater River, reached major flood stage, with crests at Anderson and Noblesville exceeding the benchmark set by the 1913 flood, previously the worst-case reference point for the state's flood-control infrastructure for over a century.
4. Governor Mike Braun issued a statewide disaster emergency declaration on August 13, 2026.
5. President Trump approved a federal Emergency Declaration for Indiana on August 15, 2026, covering 53 counties and authorizing FEMA to directly support response efforts, including evacuations, shelters, and water rescues.
6. The flooding has been linked to at least seven deaths in Indiana, with dozens of counties issuing local emergency declarations as of late August.
7. Infrastructure damage has been significant, including the collapse of River Road on Indianapolis's north side and the failure of the Hazel Dell Parkway bridge in Carmel.
8. Widespread power outages followed, with more than 85,000 customers without power as of August 19, 2026, concentrated in northern Indiana's Lake and LaPorte counties.

As of late August, the state was compiling damage assessments to request a full federal Major Disaster Declaration, which would unlock additional individual assistance beyond the initial Emergency Declaration already in place. This is worth tracking specifically, since the scope of available federal assistance, and potentially the scope of any parallel Medicare-related emergency flexibilities, can expand if that major disaster declaration is approved.

Infectious Disease and Wound Risks After Inland Flooding

Contaminated floodwater from river flooding carries real infectious disease risk, even without the brackish-water pathogens more common after coastal storms.

Leptospirosis

Leptospirosis is transmitted through water contaminated with animal urine and waste, a genuine concern after river and agricultural runoff flooding in a state with significant farmland exposure. It presents with fever, headache, chills, muscle aches, abdominal pain, and sometimes jaundice, and can progress to more serious complications, including meningitis, if untreated. Consider it in any patient with fever that isn't resolving after floodwater contact, particularly farm workers, cleanup crews, and anyone who waded through standing water.

Wound infections and tetanus

Cuts and puncture wounds from flood debris, combined with contact with contaminated water or soil, carry meaningfully elevated infection risk. Confirm tetanus vaccination status as a standard part of any wound evaluation during this period, and treat any wound with floodwater exposure as potentially contaminated regardless of how minor it looks.

Private Well Water Contamination

This is one of the more Indiana-specific risks worth emphasizing, given how much of the state, particularly in rural and agricultural counties affected by this flooding, relies on private wells rather than municipal water systems.

1. Any private well that was submerged or came into contact with floodwater should be considered contaminated until tested, regardless of how the water looks, smells, or tastes.
2. Coliform bacteria, E. coli, and other pathogens are common contaminants in flooded wells, and can cause significant gastrointestinal illness if consumed.
3. Advise patients on well water to avoid using it for drinking, cooking, or brushing teeth until it has been tested and, if needed, disinfected, and to have it tested through their local health department or a certified laboratory before resuming normal use.
4. Patients presenting with unexplained gastrointestinal illness in the weeks after the flood should be asked directly about well water use and any private well flooding, since this connection isn't always volunteered.

Respiratory Problems From Mold After Water Damage

Mold growth in flood-damaged homes and businesses begins faster than most patients expect. According to the EPA, CDC, and OSHA, mold can begin growing within 24 to 48 hours of water intrusion, and common molds such as Aspergillus, Penicillium, and Cladosporium typically appear within 24 to 72 hours, while more resistant molds like Stachybotrys generally take seven or more days of sustained moisture to establish.

Who's most at risk

1. Patients with asthma or chronic lung disease
2. Immunocompromised patients
3. Children and older adults
4. Pregnant patients

For immunocompromised patients specifically, invasive mold infection is a genuine risk, not just an irritant or allergic response, and this risk can extend for months after the initial flood event as remediation continues. Counsel patients to wear an N95 or similarly rated respirator when entering any water-damaged space, and to watch for nasal congestion, cough, wheezing, chest tightness, or asthma exacerbation, particularly if symptoms have a delayed onset following flood cleanup activity.

Carbon Monoxide Poisoning From Generators

With more than 85,000 Indiana households without power at the height of this event, generator use has been widespread, and that brings a predictable, preventable risk that's worth actively screening for.

1. Ask patients presenting with headache, dizziness, nausea, confusion, or fatigue during a power outage period specifically about generator use and its location.
2. Carbon monoxide symptoms are easy to misattribute to a viral illness or general storm-related stress, especially early on.
3. Reinforce basic generator safety guidance with patients, including running generators well away from windows, doors, and enclosed spaces, since improper placement is the most common cause of fatal carbon monoxide exposure after storms and power outages.

Disruptions to Medications and Chronic Disease Care

Evacuation, prolonged power outages, and damaged pharmacies can interrupt access to insulin, cardiac medications, dialysis, and other time-sensitive treatment quickly, particularly for patients displaced from flooded homes in the hardest-hit central Indiana counties.

1. Ask displaced or flood-affected patients directly about medication access rather than assuming they'll raise it unprompted.
2. Be ready to issue emergency refills or replacement prescriptions, and know your state's and payers' emergency prescribing flexibilities during a declared disaster.
3. Proactively flag patients on time-sensitive medications, such as insulin or anticoagulants, for outreach if your practice serves a flood-affected area.
4. The FDA recommends discarding any medication that was exposed to contaminated floodwater, even in its original, sealed container, since the container's integrity may no longer be reliable.

Mental Health Effects After Displacement

The psychological toll of a flood event this size, with entire communities displaced and, in some cases, permanent infrastructure like bridges and roads destroyed, is significant and often goes unaddressed in visits focused on physical complaints. Anxiety, acute stress reactions, disrupted sleep, and worsened depression are common in the weeks following displacement, and patients don't always bring these symptoms up on their own.

A brief, direct check-in on stress, sleep, and coping during any post-flood visit, even one unrelated to mental health, can surface issues that would otherwise go unaddressed, particularly for patients managing pre-existing mental health conditions who may be more vulnerable to destabilization during a prolonged recovery period.

Access Problems When Roads and Bridges Are Damaged

This flood event has caused real, lasting infrastructure damage, not just temporary road closures. The collapse of River Road in Indianapolis and the failure of the Hazel Dell Parkway bridge in Carmel are the kind of damage that can affect patient access to care for weeks or months, not days.

1. Confirm which of your practice's locations remain fully accessible and communicate that clearly to patients through every available channel, since a route that worked before the flood may no longer exist.
2. Consider expanding telehealth availability for patients who can't safely or practically reach the office due to road or bridge damage, particularly for routine chronic disease management visits.
3. Coordinate with local shelters or emergency response networks if your practice serves a population likely to be displaced or cut off by infrastructure damage.
4. Be aware that downstream counties along the Wabash River, including areas near Vigo County, were still facing rising water and new flood risk even as Indianapolis began its own cleanup, meaning access disruption has been rolling geographically rather than resolving all at once.

What Changes on the Billing Side During a Declared Emergency

This is where the clinical response and the revenue cycle picture connect, and it's worth understanding even if your practice doesn't handle billing directly.

Where Indiana's declaration currently stands

As of the federal Emergency Declaration approved on August 15, 2026, FEMA assistance to Indiana is capped at $5 million and intended to supplement state and local response costs like evacuations, shelters, and water rescues. The state has been compiling damage assessments to request a full Major Disaster Declaration, which would open additional individual assistance programs if approved. These are two distinct levels of federal disaster declaration, and the scope of available assistance differs meaningfully between them.

How a Section 1135 waiver gets triggered

Section 1135 of the Social Security Act allows the HHS Secretary to temporarily waive or modify certain Medicare, Medicaid, and CHIP requirements, but this authority depends on a separate HHS public health emergency declaration under Section 319 of the Public Health Service Act, alongside the Presidential disaster or emergency declaration. Practices should watch specifically for whether HHS issues its own public health emergency declaration tied to this Indiana flooding event, since that's the step that actually activates 1135 waiver authority, not the Stafford Act emergency declaration alone.

Blanket waivers versus individual requests

When 1135 waiver authority is activated for a declared emergency area, CMS often issues blanket waivers that apply automatically to similarly situated providers within that area, without requiring an individual application. When a specific circumstance isn't covered by a blanket waiver, providers can submit an individual 1135 waiver request directly to CMS.

The DR condition code and CR modifier

When Medicare payment for a claim is conditioned on a formal waiver being in effect, use of the DR condition code on institutional claims and the CR modifier on Part B claims is mandatory, not optional. Billing staff should confirm current guidance from their Medicare Administrative Contractor on when this applies during this specific declared event, since the requirement is tied to whether a claim's payment genuinely depends on an active waiver.

Geographic and time limits

Any 1135 waiver authority that does get activated applies only within the specific geographic area covered by the declared emergency, not automatically statewide, and typically runs no later than the end of the declared emergency period or 60 days from first publication, with the possibility of extension in additional 60-day increments.

Common Mistakes During Flood Response

1. Treating flood-related fever as routine viral illness without considering leptospirosis, particularly in patients with agricultural or floodwater exposure.
2. Assuming a private well is safe simply because the water looks clear, without confirming it's been tested since the flood.
3. Missing carbon monoxide exposure because early symptoms resemble general storm-related fatigue or stress.
4. Not proactively asking displaced patients about medication access, assuming they'll bring it up unprompted.
5. Overlooking mental health screening during visits focused on physical post-flood complaints.
6. Assuming a Medicare 1135 waiver automatically applies statewide without confirming whether HHS has issued its own public health emergency declaration for this specific event.
7. Failing to apply the DR condition code or CR modifier correctly on claims where payment genuinely depends on an active formal waiver.

Actionable Tips for Practices

1. Build a brief, standardized post-flood intake question set covering well water use, wound exposure, generator use, medication access, housing status, and stress or sleep disruption.
2. Keep tetanus vaccination status review part of any wound evaluation during this period, not just for visibly severe injuries.
3. Maintain a current list of patients on time-sensitive medications so outreach can happen quickly for those in flood-affected areas.
4. Monitor Indiana Department of Homeland Security and CMS emergency declaration updates directly, since the disaster declaration status has been evolving quickly and may expand to a Major Disaster Declaration.
5. Confirm whether your practice's location falls within a declared emergency area before assuming any Medicare waiver flexibility applies.
6. Train front-desk and billing staff on correct DR condition code and CR modifier use now, in case an HHS public health emergency declaration and associated 1135 waivers follow this event.

Expert Recommendations

Practices navigating this event well are treating it as a rolling situation rather than a single point-in-time emergency. Given how the flood risk has moved downstream along the Wabash River even as Indianapolis began recovery, and given that the state's request for a full Major Disaster Declaration was still pending as of late August, the practical situation on the ground, and the billing flexibilities tied to it, may keep shifting for weeks.

On the clinical side, maintaining a high index of suspicion for leptospirosis and well water contamination in patients from rural and agricultural counties, even weeks after the initial flood event, has real value given how easily both can be missed in a routine visit. On the operational side, practices that confirm their specific location's status within any declared emergency area, rather than assuming coverage extends statewide, avoid the kind of claims confusion that tends to surface weeks later during post-payment review.

Frequently Asked Questions

How severe was the August 2026 Indiana flooding?

Severe storms, a derecho, and heavy, stalled rainfall beginning August 11, 2026 caused historic flooding across central and southern Indiana, with several rivers cresting above the benchmark set by the 1913 Great Flood. At least seven deaths have been linked to the event, and Governor Braun declared a statewide disaster emergency on August 13, 2026.

What federal disaster declaration is currently in place for Indiana?

President Trump approved a federal Emergency Declaration for Indiana on August 15, 2026, covering 53 counties, authorizing FEMA to support response efforts with assistance capped at $5 million. The state has been pursuing a full Major Disaster Declaration for additional individual assistance.

Why is private well water contamination a bigger concern in Indiana than in some other flood-affected states?

A significant portion of Indiana, particularly in rural and agricultural counties affected by this flooding, relies on private wells rather than municipal water systems. Any well that was submerged during flooding should be considered contaminated until tested.

What infectious disease should physicians watch for after river flooding?

Leptospirosis is a key concern after river and agricultural runoff flooding, presenting with fever, headache, chills, muscle aches, and sometimes jaundice, with potential progression to meningitis if untreated.

Why is carbon monoxide poisoning a specific concern after this event?

Widespread power outages, including more than 85,000 customers without power at the height of the event, led to significant generator use, which carries real carbon monoxide poisoning risk when generators are used improperly near enclosed spaces.

How quickly does mold develop after flood water damage?

According to the EPA, CDC, and OSHA, mold can begin growing within 24 to 48 hours of water intrusion, with common molds like Aspergillus, Penicillium, and Cladosporium typically appearing within 24 to 72 hours.

What is a Section 1135 waiver, and does it apply to this Indiana flooding event?

A Section 1135 waiver is temporary authority allowing the HHS Secretary to waive or modify certain Medicare, Medicaid, and CHIP requirements in a declared emergency area, but it depends on a separate HHS public health emergency declaration under Section 319 of the Public Health Service Act, in addition to the Presidential disaster or emergency declaration already in place for Indiana.

What is the DR condition code and CR modifier used for?

The DR condition code is used on institutional claims, and the CR modifier on Part B claims, when Medicare payment is conditioned on a formal waiver being in effect. Use of these is mandatory, not optional, for claims meeting that condition.

Should patients discard medications exposed to floodwater?

Yes. The FDA recommends discarding medications that came into contact with contaminated floodwater, even if they remain in their original, sealed containers, since the container's integrity may be compromised.

Are access disruptions from this flood event over now that Indianapolis has begun cleanup?

Not necessarily. As Indianapolis began recovery, downstream counties along the Wabash River, including areas near Vigo County, were still facing rising water and new flood risk, meaning access disruption has moved geographically rather than resolving statewide at once.

Conclusion

The scale of this year's Indiana flooding, with rivers exceeding a benchmark that had stood for over a century, means the post-flood health effects and access disruptions are likely to extend well beyond the initial storm event. Maintaining a high index of suspicion for well water contamination, carbon monoxide exposure, and flood-associated infections, alongside proactive outreach on medication access and displacement-related stress, meaningfully improves outcomes in the weeks and months following a flood of this size. Understanding how the evolving disaster declaration affects billing, including whether an HHS public health emergency declaration and 1135 waivers follow, keeps that clinical response financially sustainable for the practices providing it.

Get Help Preparing Your Practice for Disaster-Related Billing Changes

Providing strong clinical care during a flood event of this scale is only part of the picture. Getting claims coded and submitted correctly as the disaster declaration evolves protects the revenue behind that care. Edge RCM works with Indiana and Midwest practices on emergency-related billing readiness, including 1135 waiver guidance, correct DR condition code and CR modifier application, and claims review during declared public health emergencies. If your practice wants to be ready as this declaration status continues to develop, Edge RCM can help you build that readiness now.