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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