Medical billing time limits in Indiana run in two directions: providers have deadlines to submit claims, and insurers have deadlines to pay them. For commercial insurance, a clean claim must be paid or denied within 30 days if filed electronically and 45 days if filed on paper. Provider filing deadlines are different: commercial claims follow the provider’s contract, Medicaid claims must be filed within 180 days, and Medicare claims are generally due by the end of the calendar year after the service.
When Insurers Must Pay a Clean Claim
The payment clock in Indiana turns on the idea of a clean claim. Under Indiana Code 27-8-5.7-5, a clean claim is one with no defect, impropriety, or special circumstance preventing payment.1Indiana General Assembly. Indiana Code 27-8-5.7-5 – Notice of Deficiencies in Claims That means accurate patient information, correct codes, and complete supporting documentation. If any of that is missing, the claim is not clean, and the countdown does not start.
Once a clean claim is received, Indiana Code 27-8-5.7-6 gives the insurer:
- 30 days to pay or deny if the claim was filed electronically
- 45 days to pay or deny if the claim was filed on paper
If a claim is not clean, the insurer cannot simply hold it. It must send the provider a notice describing the deficiency within the same 30 or 45 days.1Indiana General Assembly. Indiana Code 27-8-5.7-5 – Notice of Deficiencies in Claims Miss that window, and the statute has real teeth: the claim automatically becomes a clean claim regardless of the errors it contains, and the full payment timeline kicks in. Providers who track their submission dates can use this provision when an insurer tries to deny a claim weeks after the notice deadline has passed.
Interest on Late Payments
When an insurer misses the payment deadline and pays later, it owes interest on the allowable amount.2Indiana General Assembly. Indiana Code 27-8-5.7-6 – Payment or Denial of Claims, Interest Interest starts accruing on day 31 for electronic claims and day 46 for paper claims, and runs until payment is made. The rate is not written into the prompt-pay statute itself. It ties to the rate set under Indiana Code 12-15-21-3(7)(A), which is calculated from the average yield on state general fund investments and adjusts annually.3Indiana General Assembly. Indiana Code 12-15-21-3 – Required Rules It isn’t a punishing rate, but it gives providers a concrete remedy.
Provider Filing Deadlines Depend on the Payer
Indiana does not set one filing deadline that applies to every claim. The deadline depends on who pays.
Commercial Insurance
Indiana Code 27-8-5.7 does not set a statutory filing deadline for commercial claims. Filing windows come from the provider’s contract with the insurance company, and they vary widely. A practice that participates in multiple networks may face a different deadline for each payer. Missing a contractual filing deadline usually results in a denial the provider cannot pass to the patient, so each payer’s requirements have to be tracked separately.
Indiana Medicaid
For services covered by the Indiana Health Coverage Programs, providers have 180 days to file. For hospital claims, the clock runs from the date of release or discharge.4Indiana General Assembly. Indiana Code 12-16-4.5-8.5 – Provider Claim Filing Deadline The state agency administering Medicaid can extend or waive the deadline for good cause, though the statute does not define what qualifies. If a provider learns of a patient’s Medicaid eligibility during that 180-day window, the provider must bill Medicaid rather than the patient.5IN.gov. IHCP Bulletin BT2024181
Medicare
Federal rules give providers considerably more time. For services furnished on or after January 1, 2010, a Medicare claim must be filed by the end of the calendar year following the year of service, which can amount to nearly two years for services performed early in a year.6eCFR. 42 CFR 424.44 – Time Limits for Filing Claims Limited exceptions exist for retroactive Medicare entitlement or administrative errors by the agency.
When a Missed Deadline Reaches the Patient
Whether a provider’s late claim can become the patient’s bill depends on the coverage.
For Medicaid patients, the rules are firm. Federal and state law bar IHCP providers from billing patients for amounts left unpaid after Medicaid’s reimbursement determination, including amounts denied because the provider filed too late.5IN.gov. IHCP Bulletin BT2024181 Providers must accept the Medicaid payment as payment in full. If a provider collected money from a patient before learning of Medicaid coverage, that money has to be refunded once eligibility is confirmed within the filing window.
For commercial insurance, protections are less uniform. Many insurer-provider contracts prohibit balance billing patients for claims denied because of the provider’s own filing error, but this is a contractual protection rather than a blanket state law. A patient who receives a bill for services that should have been covered but were denied for late filing should contact the insurer directly to ask whether the provider is contractually barred from collecting.
Complaining to the Indiana Department of Insurance
When an insurer consistently misses payment deadlines, providers can escalate to the Indiana Department of Insurance. The IDOI investigates non-payment, repeated late payment, down-coding without notice, and payment at non-network rates instead of contracted fees. The Department will step in when a clean claim remains unpaid more than 90 days after filing.7IDOI: File a Provider Complaint – IN.gov. File a Provider Complaint
There are minimum dollar thresholds. Healthcare provider claims must involve at least $250, and hospital claims must reach at least $5,000. Anything smaller is returned without investigation. Each patient’s claim requires its own complaint, and providers should attempt to resolve the dispute with the insurer first.7IDOI: File a Provider Complaint – IN.gov. File a Provider Complaint
Complaints are submitted in writing by mail or fax. After the IDOI receives one, it assigns a case number and notifies the insurer, which then has 20 business days to respond. The Department reviews both sides and either suggests a resolution or takes administrative action.
How Long a Provider Can Sue to Collect
When bills go unpaid, providers sometimes pursue patients directly. Indiana gives creditors six years to file suit to collect most debts, including medical bills, under Indiana Code 34-11-2-7 and 34-11-2-9. Once six years have passed from the date the debt became due, the provider loses the legal right to sue. The debt itself does not disappear and can still appear on credit reports within federal reporting limits.
A patient who receives a collection notice for a medical bill should first check whether the underlying insurance claim was properly handled. A balance that exists only because the provider missed a filing deadline, or because an insurer violated prompt-pay rules, may not be the patient’s obligation, especially for Medicaid-covered services where balance billing is prohibited.