All ICD10 Codes
Chapter 18

R00–R99: Symptoms, Signs and Abnormal Clinical and Laboratory Findings

Symptoms, Signs and Abnormal Clinical and Laboratory Findings diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • abnormal findings on antenatal screening of mother (O28.-)
  • certain conditions originating in the perinatal period (P04-P96)
  • signs and symptoms classified in the body system chapters
  • signs and symptoms of breast (N63, N64.5)
All CodesBillable Only
Internal Codes
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  • R46.4|

    Slowness and poor responsiveness

  • R46.5|

    Suspiciousness and marked evasiveness

  • R46.6|

    Undue concern and preoccupation with stressful events

  • R46.7|

    Verbosity and circumstantial detail obscuring reason for contact

  • R46.8|

    Other symptoms and signs involving appearance and behavior

  • R46.81|

    Obsessive-compulsive behavior

  • R46.89|

    Other symptoms and signs involving appearance and behavior

  • R47|

    Speech disturbances, not elsewhere classified

  • R47.0|

    Dysphasia and aphasia

  • R47.01|

    Aphasia

  • R47.02|

    Dysphasia

  • R47.1|

    Dysarthria and anarthria

  • R47.8|

    Other speech disturbances

  • R47.81|

    Slurred speech

  • R47.82|

    Fluency disorder in conditions classified elsewhere

  • R47.89|

    Other speech disturbances

  • R47.9|

    Unspecified speech disturbances

  • R48|

    Dyslexia and other symbolic dysfunctions, not elsewhere classified

  • R48.0|

    Dyslexia and alexia

  • R48.1|

    Agnosia

  • R48.2|

    Apraxia

  • R48.3|

    Visual agnosia

  • R48.8|

    Other symbolic dysfunctions

  • R48.9|

    Unspecified symbolic dysfunctions

  • R49|

    Voice and resonance disorders

  • R49.0|

    Dysphonia

  • R49.1|

    Aphonia

  • R49.2|

    Hypernasality and hyponasality

  • R49.21|

    Hypernasality

  • R49.22|

    Hyponasality

  • R49.8|

    Other voice and resonance disorders

  • R49.9|

    Unspecified voice and resonance disorder

  • R50|

    Fever of other and unknown origin

  • R50.2|

    Drug induced fever

  • R50.8|

    Other specified fever

  • R50.81|

    Fever presenting with conditions classified elsewhere

  • R50.82|

    Postprocedural fever

  • R50.83|

    Postvaccination fever

  • R50.84|

    Febrile nonhemolytic transfusion reaction

  • R50.9|

    Fever, unspecified

  • R51|

    Headache

  • R51.0|

    Headache with orthostatic component, not elsewhere classified

  • R51.9|

    Headache, unspecified

  • R52|

    Pain, unspecified

  • R53|

    Malaise and fatigue

  • R53.0|

    Neoplastic (malignant) related fatigue

  • R53.1|

    Weakness

  • R53.2|

    Functional quadriplegia

  • R53.8|

    Other malaise and fatigue

  • R53.81|

    Other malaise

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