ICD-10-CM > S00-T88 > T36-T50 > T43 > T43.6 > T43.65 > T43.656 T43.656 Underdosing of methamphetamines Non-Billable/Non-Specific Codes T43.656A..., initial encounterT43.656D..., subsequent encounterT43.656S..., sequela