ICD-10-CM > L00-L99 > L80-L99 > L89 > L89.1 > L89.12 > L89.124 L89.124 Pressure ulcer of left upper back, stage 4 Billable/Specific Copy Code Copy Description Applicable To Healing pressure ulcer of left upper back, stage 4Pressure ulcer with necrosis of soft tissues through to underlying muscle, tendon, or bone, left upper back