Yes, insurance companies can and do deny coverage if medical necessity is not clearly established. Insurers use medical necessity as a formal standard to determine if a service is reasonable, effective, and required for a patient’s condition. If the documentation provided does not meet their specific criteria, they may deem the treatment not medically necessary, even if the intervention is considered clinically appropriate or beneficial.

To avoid denials, documentation must provide objective evidence that the therapy is essential rather than just helpful. Common reasons for denial due to lack of established necessity include:

• Insufficient diagnostic clarity: Not using standardized assessment tools like the ADOS during the formal diagnosis.
• Lack of baseline data: Failing to provide objective measurements (frequency, duration, or intensity) of the child’s impairments.
• Vague treatment goals: Using broad objectives like "improve communication" instead of specific, measurable goals tied to assessment findings.
• Failure to justify therapy hours: Not explaining why a specific level of intensity is required based on the child’s level of need.
• Code mismatches: Billing for services (such as direct therapy) without corresponding documentation of target behavior goals in the treatment plan.

Because insurance coverage is subject to verification and is not guaranteed, providing a consistent chain of evidence—including a diagnostic report, functional behavior assessment, and a detailed letter of medical necessity—is critical for approval.