L98.A123 Non-pressure chronic ulcer of left upper arm with necrosis of muscle

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from L98.A Non-pressure chronic ulcer of upper limb, not elsewhere classified

Applicable to

• Chronic ulcer of upper limb NOS
• Non-healing ulcer of upper limb
• Ulcer of upper limb NEC

Excludes2 (not included here)

• gangrene (I96)
• pressure ulcer (pressure area) (L89.-)
• skin infections (L00-L08)
• specific infections classified to A00-B99
• ulcer of lower limb NEC (L97.-)
• varicose ulcer (I83.0-I83.93)

Applies from L98.A1 Non-pressure chronic ulcer of upper arm

Applicable to

• Non-pressure chronic ulcer of axilla

Risk adjustment (HCC)

• CMS-HCC V28: HCC 380 — Chronic Ulcer of Skin, Except Pressure, Through to Bone or Muscle
• CMS-HCC V22: HCC 161 — Chronic Ulcer of Skin, Except Pressure
• RxHCC V08: HCC 311 — Chronic Ulcer of Skin, Except Pressure
• ESRD V24: HCC 161

MS-DRG index

Defines the logic of DRG(s) 573-575 in MDC 09.

Diagnosis Index entries for L98.A123

• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › upper limb (chronic) › upper arm › left › with › muscle necrosis

Nearby codes

• L98.A118 Non-pressure chronic ulcer of right upper arm with other specified severity
• L98.A119 Non-pressure chronic ulcer of right upper arm with unspecified severity
• L98.A12 Non-pressure chronic ulcer of left upper arm
• L98.A121 Non-pressure chronic ulcer of left upper arm limited to breakdown of skin
• L98.A122 Non-pressure chronic ulcer of left upper arm with fat layer exposed
• L98.A123 Non-pressure chronic ulcer of left upper arm with necrosis of muscle (this code)
• L98.A124 Non-pressure chronic ulcer of left upper arm with necrosis of bone
• L98.A125 Non-pressure chronic ulcer of left upper arm with muscle involvement without evidence of necrosis
• L98.A126 Non-pressure chronic ulcer of left upper arm with bone involvement without evidence of necrosis
• L98.A128 Non-pressure chronic ulcer of left upper arm with other specified severity
• L98.A129 Non-pressure chronic ulcer of left upper arm with unspecified severity