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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  • R93.421—

    Abnormal radiologic findings on diagnostic imaging of right kidney

  • R93.422—

    Abnormal radiologic findings on diagnostic imaging of left kidney

  • R93.429—

    Abnormal radiologic findings on diagnostic imaging of unspecified kidney

  • R93.49—

    Abnormal radiologic findings on diagnostic imaging of other urinary organs

  • R93.5—

    Abnormal findings on diagnostic imaging of other abdominal regions, including retroperitoneum

  • R93.6—

    Abnormal findings on diagnostic imaging of limbs

  • R93.7—

    Abnormal findings on diagnostic imaging of other parts of musculoskeletal system

  • R93.811—

    Abnormal radiologic findings on diagnostic imaging of right testicle

  • R93.812—

    Abnormal radiologic findings on diagnostic imaging of left testicle

  • R93.813—

    Abnormal radiologic findings on diagnostic imaging of testicles, bilateral

  • R93.819—

    Abnormal radiologic findings on diagnostic imaging of unspecified testicle

  • R93.89—

    Abnormal findings on diagnostic imaging of other specified body structures

  • R93.9—

    Diagnostic imaging inconclusive due to excess body fat of patient

  • R94.01—

    Abnormal electroencephalogram [EEG]

  • R94.02—

    Abnormal brain scan

  • R94.09—

    Abnormal results of other function studies of central nervous system

  • R94.110—

    Abnormal electro-oculogram [EOG]

  • R94.111—

    Abnormal electroretinogram [ERG]

  • R94.112—

    Abnormal visually evoked potential [VEP]

  • R94.113—

    Abnormal oculomotor study

  • R94.118—

    Abnormal results of other function studies of eye

  • R94.120—

    Abnormal auditory function study

  • R94.121—

    Abnormal vestibular function study

  • R94.128—

    Abnormal results of other function studies of ear and other special senses

  • R94.130—

    Abnormal response to nerve stimulation, unspecified

  • R94.131—

    Abnormal electromyogram [EMG]

  • R94.138—

    Abnormal results of other function studies of peripheral nervous system

  • R94.2—

    Abnormal results of pulmonary function studies

  • R94.30—

    Abnormal result of cardiovascular function study, unspecified

  • R94.31—

    Abnormal electrocardiogram [ECG] [EKG]

  • R94.39—

    Abnormal result of other cardiovascular function study

  • R94.4—

    Abnormal results of kidney function studies

  • R94.5—

    Abnormal results of liver function studies

  • R94.6—

    Abnormal results of thyroid function studies

  • R94.7—

    Abnormal results of other endocrine function studies

  • R94.8—

    Abnormal results of function studies of other organs and systems

  • R97.0—

    Elevated carcinoembryonic antigen [CEA]

  • R97.1—

    Elevated cancer antigen 125 [CA 125]

  • R97.20—

    Elevated prostate specific antigen [PSA]

  • R97.21—

    Rising PSA following treatment for malignant neoplasm of prostate

  • R97.8—

    Other abnormal tumor markers

  • R99—

    Ill-defined and unknown cause of mortality

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