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Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings

ICD-10-CM codes R00-R99

Covers symptoms and signs that do not yet have a definitive diagnosis, including chest pain, abdominal pain, fever, cough, headache, fatigue, and abnormal lab results. These codes are commonly used in emergency and outpatient settings when a workup is still in progress. Chest pain (R07) and abdominal pain (R10) are among the top reasons for ER visits.

R00-R09

Symptoms and Signs Involving the Circulatory and Respiratory Systems

R10-R19

Symptoms and Signs Involving the Digestive System and Abdomen

R20-R23

Symptoms and Signs Involving the Skin and Subcutaneous Tissue

R25-R29

Symptoms and Signs Involving the Nervous and Musculoskeletal Systems

R30-R39

Symptoms and Signs Involving the Genitourinary System

R40-R46

Symptoms and Signs Involving Cognition, Perception, Emotional State and Behavior

R47-R49

Symptoms and Signs Involving Speech and Voice

R50-R69

General Symptoms and Signs

R70-R79

Abnormal Findings on Examination of Blood

R80-R82

Abnormal Findings on Examination of Urine

R83-R89

Abnormal Findings on Examination of Other Body Fluids

R90-R94

Abnormal Findings on Diagnostic Imaging and in Function Studies

R97-R97

Abnormal Tumor Markers

R99-R99

Ill-Defined and Unknown Cause of Mortality

Frequently Asked Questions

What ICD-10 codes are in Chapter 18?

Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings covers ICD-10-CM codes R00-R99. It contains 14 code blocks with 89 top-level categories.

What conditions does ICD-10 Chapter 18 cover?

Covers symptoms and signs that do not yet have a definitive diagnosis, including chest pain, abdominal pain, fever, cough, headache, fatigue, and abnormal lab results. These codes are commonly used in emergency and outpatient settings when a workup is still in progress. Chest pain (R07) and abdominal pain (R10) are among the top reasons for ER visits. This chapter includes codes from R00-R99.

How many code blocks are in Chapter 18?

Chapter 18 has 14 code blocks: R00-R09 (Symptoms and Signs Involving the Circulatory and Respiratory Systems), R10-R19 (Symptoms and Signs Involving the Digestive System and Abdomen), R20-R23 (Symptoms and Signs Involving the Skin and Subcutaneous Tissue), R25-R29 (Symptoms and Signs Involving the Nervous and Musculoskeletal Systems), and 10 more.

Is there an ICD-11 equivalent of ICD-10 Chapter 18?

ICD-11 reorganizes many chapters compared to ICD-10. Some conditions in Chapter 18 may appear in different ICD-11 chapters. Use the ICD-10 to ICD-11 converter to find specific code equivalents.

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