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⚠️ '''Pre-existing condition exclusion''' is a [[Definition:Policy provision | policy provision]] that limits or denies [[Definition:Coverage | coverage]] for health conditions, injuries, or illnesses that a person was diagnosed with, received treatment for, or experienced symptoms of before the effective date of a new [[Definition:Insurance policy | insurance policy]]. Historically embedded in [[Definition:Individual health insurance | individual]] and [[Definition:Group health insurance | group health]] plans, as well as certain [[Definition:Life insurance | life]], [[Definition:Disability insurance | disability]], and [[Definition:Pet insurance | pet insurance]] products, this exclusion allowed [[Definition:Insurance carrier | carriers]] to manage [[Definition:Adverse selection | adverse selection]] by preventing individuals from purchasing coverage only after learning they needed expensive care.

🔍 In practice, a pre-existing condition exclusion typically defines a "look-back" period — often six to twelve months before the policy's effective date — during which the insurer examines whether the applicant sought medical advice, was prescribed medication, or received a diagnosis for the condition in question. If such evidence exists, the condition is excluded from coverage for a specified waiting period, after which it may become eligible. [[Definition:Underwriter | Underwriters]] historically used [[Definition:Medical underwriting | medical underwriting]] questionnaires and [[Definition:Medical information bureau (MIB) | MIB]] database checks to identify undisclosed pre-existing conditions. In [[Definition:Group insurance | group plans]], the exclusion was often waived for employees who enrolled during initial eligibility windows and maintained [[Definition:Creditable coverage | creditable prior coverage]].

📜 The passage of the [[Definition:Affordable Care Act (ACA) | Affordable Care Act]] in 2010 fundamentally altered this landscape for major medical health insurance in the United States, prohibiting pre-existing condition exclusions in all individual and group market plans effective January 2014. This reform was among the ACA's most consequential provisions, forcing insurers to redesign [[Definition:Rating methodology | rating methodologies]] and rely on mechanisms like [[Definition:Individual mandate | individual mandates]] and [[Definition:Risk adjustment | risk adjustment]] programs rather than medical screening to maintain [[Definition:Risk pool | risk pool]] stability. Outside ACA-regulated markets, however — including [[Definition:Short-term health insurance | short-term health plans]], certain [[Definition:Supplemental insurance | supplemental insurance]] products, and international health policies — pre-existing condition exclusions remain a common underwriting tool.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Medical underwriting]]
* [[Definition:Adverse selection]]
* [[Definition:Affordable Care Act (ACA)]]
* [[Definition:Creditable coverage]]
* [[Definition:Risk adjustment]]
* [[Definition:Waiting period]]
{{Div col end}}

Definition:Pre-existing condition exclusion - Revision history

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