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

 09 Diseases of the visual system

   Disorders of the ocular adnexa or orbit

   Disorders of the eyeball anterior segment

   Disorders of the eyeball posterior segment

   Disorders of the eyeball affecting both anterior and posterior segments

   Disorders of the visual pathways or centres

   Glaucoma or glaucoma suspect

     9C60  Glaucoma suspect

     9C61  Glaucoma

     9C6Y  Other specified glaucoma or glaucoma suspect

     9C6Z  Glaucoma or glaucoma suspect, unspecified

   Strabismus or ocular motility disorders

   Disorders of refraction or accommodation

   Postprocedural disorders of eye or ocular adnexa

   Impairment of visual functions

   Vision impairment

   9E1Y  Other specified diseases of the visual system

   9E1Z  Diseases of the visual system, unspecified

 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