Specified anomalies of nails

This code represents congenital malformations or developmental abnormalities affecting the fingernails or toenails that are not otherwise specified. These anomalies can include conditions such as anonychia (absence of nails), micronychia (abnormally small nails), or other structural defects present at birth. It describes a range of non-inflammatory, non-traumatic, and non-infectious nail conditions with a congenital origin.

Use this code when documentation clearly indicates a congenital or specified developmental anomaly of the nails. This applies to cases where the specific type of nail anomaly is identified but does not have a more precise ICD-9-CM code. Supporting documentation should detail the nature of the nail malformation and confirm its congenital origin.

• Do not use for acquired nail conditions, such as fungal infections (e.g., onychomycosis) or traumatic injuries.
• If a more specific congenital nail anomaly is documented and has a distinct ICD-9-CM code, use that more specific code instead.
• Ensure the medical record specifies "congenital" or "developmental anomaly" to justify using this code, as opposed to other nail disorders.