The patient is a 12-month-old with a history of muscle weakness. unfortunately, his etiology is unknown and to delineate the diagnosis neurology has consulted us to obtain a right biceps muscle biopsy. what diagnosis code is reported

The answer is M62.81. It is a billable ICD code used to specify a diagnosis of muscle weakness (generalized). A 'billable code' is detailed enough to be used to specify a medical diagnosis. The ICD code M628 is used to code Muscle weakness. Muscle weakness or myasthenia is a lack of muscle strength. The reasons are various and can be divided into conditions that have either true or perceived muscle weakness.