S62.165P Nondisplaced fracture of pisiform, left wrist, subsequent encounter for fracture with malunion

Name of the Condition

• Nondisplaced fracture of pisiform, left wrist, subsequent encounter for fracture with malunion

Summary

This condition refers to a break in the pisiform bone of the left wrist where the bone fragments remain in their normal anatomical position (nondisplaced), but healing has occurred with malunion (abnormal alignment). The pisiform is a small, pea-shaped carpal bone on the palmar (palm) side of the wrist, embedded within the flexor carpi ulnaris tendon. Malunion may result from incomplete or improper healing, potentially affecting wrist stability or function. This code is used for subsequent encounters (follow-up care) after the initial fracture treatment.

Causes

Typically caused by direct trauma to the wrist, such as a fall onto an outstretched hand, a blow to the palmar side, or a crushing injury. Malunion may develop if the fracture was not properly aligned during initial treatment or if healing was compromised.

Risk Factors

• Participation in contact sports or activities with a high risk of falls.
• Osteoporosis or weakened bone structure, especially in older adults.
• Previous wrist injuries or fractures.
• Inadequate immobilization or non-compliance with treatment during initial healing.

Symptoms

• Persistent pain, swelling, or tenderness in the palmar side of the left wrist.
• Bruising or discoloration around the injury site.
• Limited range of motion or difficulty moving the hand or fingers.
• Noticeable deformity or abnormal wrist alignment due to malunion.

Diagnosis

Physical examination to assess pain, swelling, and wrist mobility. Imaging tests, such as X-rays, CT scans, or MRIs, to confirm malunion and evaluate bone alignment. Comparison with prior imaging may be used to assess healing progress.

Treatment Options

• Immobilization with a splint or cast to support the wrist and promote proper alignment.
• Physical therapy to restore range of motion, strength, and function.
• Pain management with medications or other modalities.
• Surgical intervention (e.g., osteotomy) may be considered for severe malunion affecting function.

Prognosis and Follow-Up

Prognosis depends on the degree of malunion and functional impact. Most patients improve with conservative treatment, but residual stiffness or pain may persist. Regular follow-up appointments are necessary to monitor healing and adjust treatment as needed.

Complications

• Chronic pain or discomfort.
• Reduced wrist mobility or strength.
• Increased risk of future fractures due to altered biomechanics.
• Nerve or tendon irritation from malaligned bone.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective gear during sports or activities with fall risks.
• Maintain bone health through proper nutrition and exercise.
• Follow post-injury care instructions to support proper healing.

When to Seek Professional Help

Seek care if symptoms worsen, new swelling or deformity occurs, or if there is difficulty moving the wrist or hand. Prompt evaluation is important if infection signs (e.g., redness, warmth, fever) develop.

Tips for Medical Coders

Document the presence of malunion and specify it is a subsequent encounter. Include details on prior treatment, current functional status, and any imaging confirming malunion. Ensure documentation supports the use of this code over initial encounter codes.