09/10/2026
In ICD-10-CM, signs and symptoms are classified in Chapter 18 (Codes R00–R99). You should report these codes only when the doctor has not figured out a final diagnosis. Do not code signs or symptoms that are a normal part of a confirmed diagnosis.
For comprehensive code lookups, browse the directory on icd10data.com, or read the official rules via the Centers for Medicare and Medicaid Services (CMS).
Key Rules for Coding Symptoms
No Final Diagnosis: Use a symptom code (like R51 for headache) if tests or exams do not show a clear cause.
No Double Coding: If a combination code covers both the disease and the symptom, do not list the symptom separately.
Pending Tests: Code the highest level of certainty, such as an abnormal lab result or a provisional observation, if the patient leaves before a final answer is found.
Common Chapter 18 Code Ranges
R00–R09: Circulatory and respiratory symptoms (e.g., cough, abnormal heart beat)
R10–R19: Digestive and abdomen symptoms (e.g., abdominal pain, nausea)
R20–R23: Skin and limb symptoms (e.g., rash, swelling)
R40–R46: Nervous and mental symptoms (e.g., dizziness, altered mental state)
R50–R69: General body signs (e.g., R50 fever, R51 headache, R53 fatigue)
