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L98.421 Non-pressure chronic ulcer of back limited to breakdown of skin
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L98.422 Non-pressure chronic ulcer of back with fat layer exposed
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L98.423 Non-pressure chronic ulcer of back with necrosis of muscle
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L98.424 Non-pressure chronic ulcer of back with necrosis of bone
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L98.425 Non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis
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L98.426 Non-pressure chronic ulcer of back with bone involvement without evidence of necrosis
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L98.428 Non-pressure chronic ulcer of back with other specified severity
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L98.429 Non-pressure chronic ulcer of back with unspecified severity