The ICD-10 code for weakness is R53.1. This code is used to specify a medical diagnosis of weakness, which is a general term for reduced strength or energy in any part of the body. The code is valid for the fiscal year 2023, which runs from October 01, 2022, to September 30, 2023. The code is part of the ICD-10-CM (Clinical Modification), which is a system of codes that classify diseases and health problems for statistical and billing purposes. The code can be used in all HIPAA-covered transactions, which are electronic exchanges of health information between healthcare providers, health plans, and clearinghouses4. The code has four characters, with the first character being a letter and the remaining three being numbers. The code belongs to the category R53 – Malaise and fatigue, which is under the chapter R00-R99 – Symptoms, signs, and abnormal clinical and laboratory findings, not elsewhere classified.