S90.521A Blister (nonthermal), right ankle, initial encounter

ICD10CM code

#### Name of the Condition
- Blister (nonthermal), right ankle
- Medical term: S90.521A

#### Summary
A blister is a small pocket of fluid that forms on the upper layers of skin, often due to friction or pressure. This condition specifically refers to a blister located on the right ankle, treated during an initial medical encounter.

#### Causes
Blisters commonly occur due to:
- Excessive friction from activities like walking, running, or wearing ill-fitting shoes.
- Skin reactions to allergens or irritants.

#### Risk Factors
Factors that may increase the likelihood of developing blisters on the ankle include:
- Wearing new or poorly fitting footwear.
- Engaging in sports or activities that involve repetitive movements.
- Having sensitive skin or existing skin conditions.

#### Symptoms
Patients with a blister on the right ankle may experience:
- A raised, fluid-filled bubble on the skin.
- Soreness or tenderness around the blistered area.
- Itching or irritation.

#### Diagnosis
Diagnosis typically involves:
- Physical examination of the affected area.
- Patient history to assess activities and footwear.

#### Treatment Options
Treatment includes:
- Protecting the blister with a sterile bandage.
- Using moleskin padding to reduce friction.
- Applying antibacterial ointments to prevent infection.
- Avoiding activities that cause further irritation.

#### Prognosis and Follow-Up
- Blisters usually heal on their own within a few days to a week.
- Regular monitoring is essential to check for signs of infection.
- Follow-up care may be necessary if healing is prolonged or complications arise.

#### Complications
If left untreated or improperly managed, blisters can lead to:
- Infection.
- Ulceration, especially in patients with diabetes or circulation issues.

#### Lifestyle & Prevention
- Wear properly fitting shoes.
- Use moisture-wicking socks.
- Apply talcum powder to reduce friction in high-risk areas.

#### When to Seek Professional Help
Seek medical attention if:
- The blister shows signs of infection (redness, warmth, pus).
- The blister is large, painful, or isn't healing.

#### Additional Resources
- American Academy of Dermatology (AAD) [www.aad.org](https://www.aad.org)
- Mayo Clinic [www.mayoclinic.org](https://www.mayoclinic.org)

#### Tips for Medical Coders
- Ensure documentation specifies the location (right ankle) and that the encounter is initial.
- Avoid confusing with similar conditions like burns or abrasions.

Medical Policies and Guidelines for Blister (nonthermal), right ankle, initial encounter

Related policies from health plans

Similar Codes