Open bite of unspecified thumb with damage to nail, sequela

This code describes a past injury to an unspecified thumb, specifically an open bite that resulted in damage to the nail. The "sequela" indicates that this code is used for complications or conditions arising directly from the initial injury, even after the acute phase has passed.

This code is appropriate when documenting a patient presenting with a chronic issue, deformity, or ongoing complication related to an old open bite injury of the thumb that involved nail damage. Examples include nail dystrophy, chronic paronychia, or a permanently altered nail bed resulting from the initial trauma. It should not be used for the initial acute injury.

• Always use this code as a secondary diagnosis, following a code that describes the specific sequela or current condition.
• Ensure documentation clearly links the current thumb condition to a previous open bite with nail damage.
• Verify laterality (left/right thumb) if specified in the clinical notes; "unspecified" should only be used when laterality is truly unknown.