What tools determine medical necessity?

Insurance companies and healthcare programs use specific clinical criteria tools, coding systems, and regulatory guidelines to determine medical necessity.

Decision-Support and Criteria Tools

• InterQual: An evidence-based software tool used by payers to evaluate the appropriate level of care, setting, and length of stay based on objective clinical data.
• Milliman Care Guidelines (MCG): Evidence-based guidelines utilized by healthcare organizations to assist in managing and deciding appropriate patient care and treatment pathways.
• ASAM Criteria: The American Society of Addiction Medicine standards widely used as a standard assessment tool for determining the appropriate level of care for substance use disorders.

Government and Regulatory Guidelines

• National Coverage Determinations (NCDs): CMS policies issued nationally that outline whether specific medical items, services, or procedures are covered by Medicare.
• Local Coverage Determinations (LCDs): Regional guidelines established by Medicare Administrative Contractors (MACs) that specify coverage rules within specific geographic areas.

Coding and Documentation Frameworks

• ICD-10-CM Diagnostics: Diagnostic codes matched with procedure codes (CPT/HCPCS) on claims to prove a clinical reason for the ordered care.
• Letters of Medical Necessity (LMN): Provider-written documents detailing specific patient symptoms, functional impairments, and treatment justifications.