This case-sensitive code system http://hl7.org/fhir/us/breastcancer/CodeSystem/cimi-entity-LanguageQualifierCS defines the following codes:

Code	Display	Definition
preferred_spoken	Preferred language	Preferred language
secondary_spoken	Secondary language	Secondary language
apraxia	Difficulty speaking due to motor disorder	Difficulty speaking due to motor disorder
aphasia	Difficulty in speaking, listening, reading, and writing	Difficulty in speaking, listening, reading, and writing
signs	Uses sign language	Uses sign language
braille	Reads using braille	Reads using braille
lipreads	Uses lipreading (speechreading)	Uses lipreading (speechreading)
aac	Uses augmentative and alternative communication	Uses augmentative and alternative communication