ICD-10-CM > L00-L99 > L80-L99 > L89 > L89.1 > L89.13 > L89.134 L89.134 Pressure ulcer of right lower back, stage 4 Billable/Specific Copy Code Copy Description Applicable To Healing pressure ulcer of right lower back, stage 4Pressure ulcer with necrosis of soft tissues through to underlying muscle, tendon, or bone, right lower back