ICD-10-CM > L00-L99 > L80-L99 > L89 > L89.1 > L89.14 > L89.144 L89.144 Pressure ulcer of left lower back, stage 4 Billable/Specific Copy Code Copy Description Applicable To Healing pressure ulcer of left lower back, stage 4Pressure ulcer with necrosis of soft tissues through to underlying muscle, tendon, or bone, left lower back