01 Certain infectious or parasitic diseases

 02 Neoplasms

 03 Diseases of the blood or blood-forming organs

 04 Diseases of the immune system

 05 Endocrine, nutritional or metabolic diseases

 06 Mental, behavioural or neurodevelopmental disorders

 07 Sleep-wake disorders

 08 Diseases of the nervous system

   Movement disorders

   Disorders with neurocognitive impairment as a major feature

   Multiple sclerosis or other white matter disorders

   Epilepsy or seizures

   Headache disorders

   Cerebrovascular diseases

   Spinal cord disorders excluding trauma

   Motor neuron diseases or related disorders

   Disorders of nerve root, plexus or peripheral nerves

   Diseases of neuromuscular junction or muscle

     Myasthenia gravis or certain specified neuromuscular junction disorders

       8C60  Myasthenia gravis

       8C61  Congenital myasthenic syndromes

       8C62  Lambert-Eaton syndrome

       8C6Y  Other specified myasthenia gravis and neuromuscular junction disorders

       8C6Z  Unspecified myasthenia gravis or neuromuscular junction disorders

     Primary disorders of muscles

     Secondary myopathies

     8D0Y  Other specified diseases of neuromuscular junction or muscle

     8D0Z  Diseases of neuromuscular junction or muscle, unspecified

   Cerebral palsy

   Nutritional or toxic disorders of the nervous system

   Disorders of cerebrospinal fluid pressure or flow

   Disorders of autonomic nervous system

   Human prion diseases

   Disorders of consciousness

   Other disorders of the nervous system

   Postprocedural disorders of the nervous system

   8E7Y  Other specified diseases of the nervous system

   8E7Z  Diseases of the nervous system, unspecified

 09 Diseases of the visual system

 10 Diseases of the ear or mastoid process

 11 Diseases of the circulatory system

 12 Diseases of the respiratory system

 13 Diseases of the digestive system

 14 Diseases of the skin

 15 Diseases of the musculoskeletal system or connective tissue

 16 Diseases of the genitourinary system

 17 Conditions related to sexual health

 18 Pregnancy, childbirth or the puerperium

 19 Certain conditions originating in the perinatal period

 20 Developmental anomalies

 21 Symptoms, signs or clinical findings, not elsewhere classified

 22 Injury, poisoning or certain other consequences of external causes

 25 Codes for special purposes