Chapter XVIII of 22
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Codes R00–R99Category range as published by CMS
Search within ICD-10-CM — results across the whole code set will include categories R00–R99 from this chapter.
About this chapter
ICD-10-CM Chapter XVIII — “Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified” — spans every category from R00 through R99. Each category in that range expands into a header code and one or more billable codes with additional specificity (laterality, episode of care, or clinical detail). Open any code’s own page to see its exact position in the hierarchy, its parent and children, and whether it’s billable.