I.C.18

Chapter 18: Symptoms, signs, and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)

Chapter 18 includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded. Signs and symptoms that point to a specific diagnosis have been assigned to a category in other chapters of the classification.

In this section

I.C.18.aUse of symptom codes
I.C.18.bUse of a symptom code with a definitive diagnosis code
I.C.18.cCombination codes that include symptoms
I.C.18.dRepeated falls
I.C.18.eComa
I.C.18.fFunctional quadriplegia
I.C.18.gSIRS due to Non-Infectious Process
I.C.18.hDeath NOS
I.C.18.iNIHSS Stroke Scale

ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026 (effective October 1, 2025). Published by CMS and NCHS. Reproduced for reference — always verify against the official CMS release.