S90.425 Blister (nonthermal), left lesser toe(s)

Name of the Condition

• Blister (nonthermal), left lesser toe(s) (ICD-10 code: S90.425)

Summary

A blister (nonthermal) of the left lesser toe(s) is a localized collection of fluid beneath the skin, typically resulting from friction or minor trauma. This condition involves the outer layers of the skin and is not caused by heat-related injuries. The blister may be painful but is generally superficial and resolves with proper care.

Causes

Direct friction from ill-fitting footwear or repetitive rubbing. Minor trauma, such as stubbing the toe or impact with a hard object. Prolonged pressure or irritation from activities like walking or running.

Risk Factors

• Wearing tight or poorly fitting shoes or socks.
• Engaging in activities that increase toe friction (e.g., sports, hiking).
• Reduced sensation in the feet due to conditions like diabetes or neuropathy.

Symptoms

• Fluid-filled sac on the left lesser toe(s), often clear or slightly yellow.
• Pain, tenderness, or burning sensation at the site.
• Redness or swelling around the blister.

Diagnosis

Physical examination of the left lesser toe(s) to assess the blister's size, location, and surrounding skin. Review of the patient's history to identify potential causes, such as recent footwear changes or activities.

Treatment Options

• Keeping the blister clean and dry to prevent infection.
• Applying protective dressings or moleskin to reduce friction.
• Avoiding popping the blister to allow natural healing.

Prognosis and Follow-Up

Most blisters heal within a few days to a week with proper care. Follow-up may be needed if symptoms worsen or if infection signs (e.g., pus, increased redness) develop.

Complications

• Infection, particularly if the blister is popped or becomes contaminated.
• Delayed healing due to persistent friction or pressure.

Lifestyle & Prevention

• Wear well-fitting shoes and moisture-wicking socks to reduce friction.
• Use padding or protective gear during activities that stress the toes.
• Inspect feet regularly, especially for those with reduced sensation.

When to Seek Professional Help

Seek care if the blister shows signs of infection (pus, worsening redness, fever) or if pain is severe and unresponsive to home care.

Tips for Medical Coders

Document the specific location (left lesser toe(s)) and confirm the blister is nonthermal. Ensure clinical notes support the diagnosis and exclude heat-related causes.