S62.235P Other nondisplaced fracture of base of first metacarpal bone, left hand, subsequent encounter for fracture with malunion

Name of the Condition

• Other nondisplaced fracture of base of first metacarpal bone, left hand, subsequent encounter for fracture with malunion

Summary

This condition involves a nondisplaced fracture at the base of the first metacarpal bone in the left hand, where the bone fragments remain aligned but have healed in an abnormal position (malunion). It is classified as a subsequent encounter, indicating follow-up care for the fracture. The malunion may affect function and require monitoring or intervention depending on the degree of misalignment and associated symptoms.

Causes

Typically caused by direct trauma, such as a fall onto an outstretched hand, a blow to the thumb, or a crushing injury. High-impact activities or accidents may also lead to fractures in this area. Malunion can occur if the initial fracture heals improperly, often due to inadequate immobilization or poor alignment during healing.

Risk Factors

• Participation in contact sports or activities with a high risk of falls.
• Osteoporosis or weakened bone structure, especially in older adults.
• Previous hand or thumb injuries that may have compromised bone integrity.
• Inadequate initial treatment or immobilization of the fracture.

Symptoms

• Pain, swelling, and tenderness at the base of the thumb or left hand.
• Bruising or discoloration around the injury site.
• Limited range of motion or difficulty moving the thumb.
• Visible deformity in severe cases.
• Altered grip strength or functional impairment due to malunion.

Diagnosis

Physical examination to assess pain, swelling, and mobility. Imaging tests, such as X-rays, CT scans, or MRIs, to confirm the fracture and evaluate the extent of malunion, including any joint involvement or displacement. Comparison with prior imaging may be used to assess healing progression.

Treatment Options

Treatment depends on the severity of malunion and functional impact. Options may include:

• Immobilization with a splint or cast to support healing.
• Physical therapy to improve range of motion and strength.
• Pain management with medications or modalities.
• Surgical intervention, such as osteotomy or realignment, if malunion significantly impairs function.

Prognosis and Follow-Up

Prognosis varies based on the degree of malunion and response to treatment. Most patients experience improved function with appropriate care, but some may have persistent limitations. Follow-up imaging and clinical assessments are typically recommended to monitor healing and adjust treatment as needed.

Complications

• Chronic pain or discomfort at the fracture site.
• Reduced range of motion or grip strength.
• Arthritis or joint degeneration due to malalignment.
• Nerve or tendon irritation from abnormal bone healing.

Lifestyle & Prevention

• Use protective gear during high-risk activities.
• Maintain bone health with adequate calcium and vitamin D.
• Avoid re-injury by following activity restrictions during healing.
• Engage in exercises to strengthen hand and wrist muscles once cleared by a provider.

When to Seek Professional Help

Seek care if symptoms worsen, new deformity develops, or there is increased pain, swelling, or difficulty moving the thumb. Prompt evaluation is important if numbness, tingling, or circulation changes occur, as these may indicate nerve or vascular involvement.

Tips for Medical Coders

Document the presence of malunion and the nature of the subsequent encounter (e.g., follow-up, treatment). Ensure clinical notes specify the fracture's alignment status and any functional impact to support coding accuracy. Include details on imaging findings or treatment provided to clarify the encounter type.