Secondary focal hyperhidrosis

This code signifies excessive sweating localized to specific areas of the body, which is a symptom or consequence of an underlying medical condition, medication, or neurological disorder. Unlike primary hyperhidrosis, secondary focal hyperhidrosis is not idiopathic but rather an acquired manifestation of another disease process.

Apply this code when documentation clearly states focal hyperhidrosis is secondary to another diagnosed condition, such as neuropathy, thyroid disease, or a side effect of a prescribed medication. The medical record must identify the primary underlying cause to support the "secondary" designation.

• Always code the underlying primary condition first, followed by this code to indicate the secondary manifestation.
• Distinguish carefully from primary focal hyperhidrosis (L74.51x), which has no identifiable underlying cause.
• Ensure the documentation specifies "focal" (localized) rather than generalized hyperhidrosis.