S90.426S Blister (nonthermal), unspecified lesser toe(s), sequela

Name of the Condition

• Blister (nonthermal), unspecified lesser toe(s), sequela (ICD-10 code: S90.426S)

Summary

A blister (nonthermal) of the unspecified lesser toe(s), sequela, refers to a residual or chronic condition resulting from a previous nonthermal blister injury. This involves persistent fluid collection or skin changes beneath the skin of the lesser toe(s) following the initial injury. The condition may cause ongoing discomfort or altered skin integrity, depending on the extent of healing.

Causes

The sequela arises from a prior nonthermal blister injury, typically caused by friction, minor trauma, or prolonged pressure. The original injury may have involved ill-fitting footwear, repetitive rubbing, or direct impact to the toe.

Risk Factors

• History of previous nonthermal blister injuries to the lesser toe(s).
• Delayed or inadequate initial treatment of the original blister.
• Underlying conditions affecting skin healing, such as diabetes or vascular disease.

Symptoms

• Persistent fluid-filled sac or altered skin texture at the site of the original blister.
• Mild pain, tenderness, or itching in the affected area.
• Possible redness or thickening of the skin over time.

Diagnosis

Physical examination of the lesser toe(s) to assess residual skin changes, fluid collection, or scarring. Review of the patient's history to confirm a prior nonthermal blister injury and evaluate healing progress.

Treatment Options

• Protecting the area with padding or footwear to reduce friction.
• Applying moisturizers or topical treatments to support skin repair.
• Monitoring for signs of infection or worsening symptoms.

Prognosis and Follow-Up

Most sequela resolve with proper care, though some may persist as minor skin changes. Follow-up may be needed to assess healing or address complications like infection. Long-term outcomes depend on the initial injury severity and patient-specific factors.

Complications

• Chronic skin changes or scarring at the site.
• Increased risk of recurrent blisters if underlying causes (e.g., footwear) are unaddressed.
• Potential for secondary infection if the area remains irritated.

Lifestyle & Prevention

• Wearing properly fitting shoes and socks to minimize friction.
• Using protective measures (e.g., moleskin) during activities that stress the toes.
• Maintaining good foot hygiene to support skin health.

When to Seek Professional Help

Seek care if the sequela shows signs of infection (e.g., pus, increased redness, fever) or if pain or swelling worsens. Persistent or non-healing changes should also be evaluated by a healthcare provider.

Tips for Medical Coders

Document the sequela status clearly, as this code is used for conditions resulting from a prior nonthermal blister injury. Ensure the record specifies the affected toe(s) as "unspecified lesser toe(s)" and confirms the chronic or residual nature of the condition.