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

Name of the Condition

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

Summary

A blister (nonthermal) of the unspecified 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 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 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 resolve within a few days with proper care. Follow-up may be recommended if symptoms worsen, signs of infection develop, or the blister does not heal as expected.

Complications

• Infection, particularly if the blister is popped or becomes contaminated.
• Delayed healing due to persistent friction or pressure.
• Scarring in rare cases, especially with improper care.

Lifestyle & Prevention

• Wear properly fitting shoes and socks to reduce friction.
• Use moisture-wicking materials to keep feet dry during activities.
• Gradually break in new footwear to minimize irritation.
• Protect toes during activities with repetitive movement.

When to Seek Professional Help

Seek care if the blister shows signs of infection (e.g., pus, increased redness, warmth), if pain is severe, or if there is reduced sensation in the toe.

Tips for Medical Coders

Document the specific toe(s) affected and whether the blister is thermal or nonthermal. For unspecified lesser toe(s), ensure the absence of more specific details (e.g., right/left, great toe) is noted. Include details on causative factors (e.g., friction, trauma) to support code assignment.