Free Medical Coding > ICD10 CM > 2024 ICD-10-CM Codes > 2024 ICD-10-CM Codes R00-R99 – Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99) > 2024 ICD-10-CM Codes R50-R69 – General symptoms and signs (R50-R69) > 2024 ICD-10-CM Codes R51 – Headache