🔍 Chapter 18 · R00-R99
Symptoms & Signs Diagnosis Codes
Symptom codes are used when a definitive diagnosis hasn't yet been established. Codes for chest pain, fatigue, fever, and abnormal test results fall here. These are often used during initial workups before a specific condition is identified.
About This Chapter
Chapter 18 of the ICD-10-CM classification covers symptoms, signs and abnormal clinical and laboratory findings, spanning codes R00-R99. These codes are used by healthcare providers to document diagnoses in your electronic health record (EHR), on insurance claims, and on medical bills.
Why this matters: If you see a code starting with R on your medical bill or health records, it likely falls in this chapter. Understanding what chapter your code belongs to can help you make sense of your diagnosis and ask better questions at your next appointment.
Diagnosis Codes in This Chapter
Browse the 32 diagnosis codes we currently cover in this chapter. Select any code to read a plain-English explanation.
R00.0Tachycardia (Fast Heart Rate)
R00.1Bradycardia (Slow Heart Rate)
R05.9Cough
R06.00Dyspnea (Shortness of Breath)
R06.02Shortness of Breath
R07.9Chest Pain, Unspecified
R09.81Nasal Congestion
R10.9Abdominal Pain, Unspecified
R11.0Nausea
R11.2Nausea with Vomiting
R13.10Dysphagia (Difficulty Swallowing)...
R19.7Diarrhea, Unspecified
R21Rash and Other Nonspecific Skin Eruption...
R22.9Localized Swelling
R31.9Hematuria (Blood in Urine)
R35.0Urinary Frequency
R39.15Urgency of Urination
R40.20Unspecified Coma
R41.0Disorientation
R42Dizziness
R45.851Suicidal Ideation
R47.1Dysarthria (Slurred Speech)
R50.9Fever, Unspecified
R51.9Headache
R53.83Fatigue
R55Syncope (Fainting)
R56.9Unspecified Convulsions
R63.0Anorexia (Loss of Appetite)
R63.4Abnormal Weight Loss
R63.6Underweight
R73.03Prediabetes
R73.09Abnormal Glucose, Other