B4509

B4509 is the ICF code for Additional functions of the respiratory system, unspecified, classified under Body Functions. It is part of the WHO International Classification of Functioning, Disability and Health.

B4509 belongs to the Body Functions component of the ICF. Physiological functions of body systems, including psychological functions.

The ICF (International Classification of Functioning, Disability and Health) is a WHO classification that describes how health conditions affect a person's functioning — body functions, body structures, activities and participation, and environmental factors. It complements ICD-10/ICD-11 diagnosis codes with functioning assessment data used in rehabilitation, disability evaluation, and care planning.