ICD-10-CM > R00-R99 > R50-R69 > R53 > R53.1 R53.1 Weakness Billable/Specific Copy Code Copy Description Applicable To Asthenia NOS Type 1 Excludes age-related weakness (R54)muscle weakness (generalized) (M62.81)sarcopenia (M62.84)senile asthenia (R54)