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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  • R19.36—

    Epigastric abdominal rigidity

  • R19.37—

    Generalized abdominal rigidity

  • R19.4—

    Change in bowel habit

  • R19.5—

    Other fecal abnormalities

  • R19.6—

    Halitosis

  • R19.7—

    Diarrhea, unspecified

  • R19.8—

    Other specified symptoms and signs involving the digestive system and abdomen

  • R20.0—

    Anesthesia of skin

  • R20.1—

    Hypoesthesia of skin

  • R20.2—

    Paresthesia of skin

  • R20.3—

    Hyperesthesia

  • R20.8—

    Other disturbances of skin sensation

  • R20.9—

    Unspecified disturbances of skin sensation

  • R21—

    Rash and other nonspecific skin eruption

  • R22.0—

    Localized swelling, mass and lump, head

  • R22.1—

    Localized swelling, mass and lump, neck

  • R22.2—

    Localized swelling, mass and lump, trunk

  • R22.30—

    Localized swelling, mass and lump, unspecified upper limb

  • R22.31—

    Localized swelling, mass and lump, right upper limb

  • R22.32—

    Localized swelling, mass and lump, left upper limb

  • R22.33—

    Localized swelling, mass and lump, upper limb, bilateral

  • R22.40—

    Localized swelling, mass and lump, unspecified lower limb

  • R22.41—

    Localized swelling, mass and lump, right lower limb

  • R22.42—

    Localized swelling, mass and lump, left lower limb

  • R22.43—

    Localized swelling, mass and lump, lower limb, bilateral

  • R22.9—

    Localized swelling, mass and lump, unspecified

  • R23.0—

    Cyanosis

  • R23.1—

    Pallor

  • R23.2—

    Flushing

  • R23.3—

    Spontaneous ecchymoses

  • R23.4—

    Changes in skin texture

  • R23.8—

    Other skin changes

  • R23.9—

    Unspecified skin changes

  • R25.0—

    Abnormal head movements

  • R25.1—

    Tremor, unspecified

  • R25.2—

    Cramp and spasm

  • R25.3—

    Fasciculation

  • R25.8—

    Other abnormal involuntary movements

  • R25.9—

    Unspecified abnormal involuntary movements

  • R26.0—

    Ataxic gait

  • R26.1—

    Paralytic gait

  • R26.2—

    Difficulty in walking, not elsewhere classified

  • R26.81—

    Unsteadiness on feet

  • R26.89—

    Other abnormalities of gait and mobility

  • R26.9—

    Unspecified abnormalities of gait and mobility

  • R27.0—

    Ataxia, unspecified

  • R27.8—

    Other lack of coordination

  • R27.9—

    Unspecified lack of coordination

  • R29.0—

    Tetany

  • R29.1—

    Meningismus

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