P15.2 Sternomastoid injury due to birth injury

Name of the Condition

• Sternomastoid Injury Due to Birth Injury
• ICD-10-CM Code: P15.2

Summary

Sternomastoid injury due to birth injury refers to trauma or damage to the sternocleidomastoid muscle (SCM) of a newborn that occurs during the delivery process. This condition, often resulting from mechanical forces, can range from mild bruising or muscle strain to more significant injury, such as a hematoma or fibrosis. The SCM, a large muscle in the neck, may be affected by excessive stretching, compression, or traction during birth, leading to localized swelling, pain, or restricted movement.

Causes

Birth-related sternomastoid injury typically results from mechanical forces during delivery, such as excessive stretching or compression of the neck. Factors like difficult or prolonged labor, use of delivery-assisting tools (e.g., forceps or vacuum extraction), or abnormal fetal positioning (e.g., breech presentation) may contribute to this injury. In some cases, the injury may occur due to direct pressure on the muscle from the birth process, particularly if the infant’s head is turned or tilted during delivery.

Risk Factors

• Prolonged or difficult labor
• Use of forceps or vacuum extraction
• Abnormal fetal presentation (e.g., breech position)
• Large fetal size (macrosomia)
• Maternal pelvic abnormalities or prior surgeries

Symptoms

• Swelling or a firm mass in the neck (hematoma)
• Limited neck movement or torticollis (head tilting to one side)
• Pain or tenderness over the sternomastoid muscle
• Asymmetry of the neck or head position
• Possible facial flattening on the affected side (if torticollis persists)

Diagnosis

Diagnosis involves a thorough physical examination of the newborn, focusing on the neck and head position. A healthcare provider may assess for swelling, tenderness, or restricted movement. Imaging studies, such as ultrasound, may be used to evaluate for hematoma or muscle damage. In some cases, neurological assessment may be performed to rule out associated nerve injury.

Treatment Options

• Observation for mild cases, as many injuries resolve spontaneously
• Physical therapy to improve neck mobility and prevent torticollis
• Pain management if discomfort is significant
• Surgical intervention (rare) for severe or persistent cases, such as fibrosis or contracture

Prognosis and Follow-Up

Most cases of sternomastoid injury due to birth injury have a favorable prognosis, especially with early intervention. Mild injuries often resolve within weeks to months with minimal treatment. However, persistent torticollis or fibrosis may require ongoing physical therapy or, in rare cases, surgical correction. Follow-up appointments are typically recommended to monitor neck movement and ensure proper healing.

Complications

• Persistent torticollis (abnormal head position)
• Muscle fibrosis or contracture
• Facial asymmetry due to prolonged head tilting
• Delayed motor development if untreated

Lifestyle & Prevention

• For infants with mild injury, gentle neck exercises (as directed by a healthcare provider) may aid recovery.
• Avoid forcing the neck into unnatural positions during handling.
• Prenatal care to manage risk factors (e.g., fetal size, labor complications) may reduce the likelihood of birth-related injuries.

When to Seek Professional Help

• If the newborn shows significant neck swelling, pain, or inability to move the neck.
• If torticollis persists beyond a few weeks.
• If there are signs of infection (e.g., redness, warmth) at the injury site.
• If the infant has difficulty feeding or breathing.

Tips for Medical Coders

• Code P15.2 is specific to sternomastoid injury due to birth injury and should be used when documentation confirms this diagnosis.
• Ensure the injury is clearly attributed to the birth process, with no other underlying causes (e.g., trauma post-delivery) indicated.
• Documentation should specify the nature of the injury (e.g., hematoma, strain) to support coding accuracy.
• Avoid using this code for non-birth-related sternomastoid injuries or for injuries to other neck muscles.