S420

S420 is the ICF code for Structure of immune system, classified under Body Structures. It is part of the WHO International Classification of Functioning, Disability and Health.

S420 belongs to the Body Structures component of the ICF. Anatomical parts of the body such as organs, limbs, and their components.

S420 has 7 child codes, including: S4200 (Lymphatic vessels), S4201 (Lymphatic nodes), S4202 (Thymus), and 4 more.

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.