Compliance, Regulatory & Policies -
Policy, Billing, or Coverage Update -
2025
Reimbursement Policy: PO-RE-065 Diagnosis of Idiopathic Environmental Intolerance
Idiopathic environmental intolerance (IEI), formerly called multiple chemical sensitivity (MCS), is a subjective condition characterized by recurrent, nonspecific symptoms attributed to low levels of chemical, biologic, or physical agents in the absence of consistent objective diagnostic physical findings or laboratory tests that define an illness (AAAAI, 1999; ACOEM, 1999; Black & Temple, 2024).
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