S83.511A

Sprain of anterior cruciate ligament of right knee, initial encounter

Sprain of the anterior cruciate ligament (ACL) of the right knee is a common orthopedic injury involving a partial or complete tear of the primary stabilizing ligament in the center of the knee joint. The ACL is crucial for preventing the tibia (shinbone) from sliding in front of the femur (thighbone) and provides rotational stability. This specific code, S83.511A, denotes an injury occurring in the right knee during the 'initial encounter' phase, which means the patient is currently receiving active treatment such as surgical consultation, diagnostic imaging (MRI), or immediate post-injury management. Injuries typically range from Grade 1 (micro-tears) to Grade 3 (complete rupture). Damage often occurs concurrently with other structures, such as the medial collateral ligament (MCL) or the meniscus.

Clinical Symptoms

  • A distinct 'popping' sound or sensation at the time of injury
  • Immediate and severe pain in the right knee
  • Rapid swelling within 2 to 6 hours (hemarthrosis)
  • Inability to continue physical activity or bear weight on the right leg
  • Feeling of instability or the knee 'giving out' (buckling)
  • Loss of full range of motion, particularly difficulty straightening the knee
  • Tenderness along the joint line
  • Bruising or ecchymosis around the knee area in the days following injury

Common Causes

  • Sudden deceleration and changing direction (cutting maneuvers)
  • Pivoting with the right foot firmly planted on the ground
  • Landing awkwardly from a jump (valgus stress)
  • Direct impact to the lateral side of the knee during sports like football or soccer
  • Forceful hyperextension of the knee joint
  • Risk factors include female gender (due to anatomical and hormonal differences)
  • Poor neuromuscular control and muscle fatigue
  • Inadequate athletic footwear or high-traction playing surfaces

Documentation & Coding Tips

Explicitly state the laterality and the specific ligament involved to satisfy ICD-10-CM specificity requirements.

Example: Patient presents for initial evaluation of an acute right knee injury sustained during a soccer match. Mechanism involved a non-contact deceleration and pivoting maneuver followed by an immediate pop and swelling. Physical examination reveals a positive Lachman test and positive anterior drawer on the right knee. Billing Focus: Right laterality and anterior cruciate ligament identification. Risk Adjustment: Documentation of acute injury status for initial encounter (A) suffix and severity of joint instability.

Billing Focus: Laterality (Right) and specific ligament (ACL) must be identified to support S83.511A.

Document the episode of care accurately by distinguishing between active treatment and routine healing.

Example: Initial encounter for right knee ACL sprain. Patient is currently being evaluated for surgical reconstruction versus conservative management. Current symptoms include significant right knee effusion and inability to bear weight. Orthopedic surgical consultation is scheduled. Billing Focus: Seventh character A for initial encounter during active phase of treatment. Risk Adjustment: Accurately reflects the high resource intensity of the diagnostic and decision-making phase.

Billing Focus: Use of seventh character A is required for encounters where the patient is receiving active treatment.

Include results of objective clinical stability maneuvers like the Lachman or Pivot-Shift tests.

Example: Right knee examination demonstrates a Grade II+ Lachman test with a soft endpoint compared to the contralateral side. Anterior drawer test is positive for 6mm of excursion. Billing Focus: Clinical findings support the diagnosis of ACL sprain/tear. Risk Adjustment: Severity of the sprain (Grade I, II, or III) helps justify the medical necessity of advanced imaging and surgical intervention.

Billing Focus: Clinical signs of instability support the medical necessity for the specific diagnosis code and subsequent MRI.

Specify the presence or absence of concurrent injuries like meniscus tears or collateral ligament involvement.

Example: Patient diagnosed with a sprain of the right anterior cruciate ligament. Evaluation of the medial and lateral compartments shows no joint line tenderness, and Valgus/Varus stress tests are stable at 0 and 30 degrees. Billing Focus: Excludes concurrent ligamentous injury, ensuring the ACL-specific code is the primary diagnosis. Risk Adjustment: Helps distinguish between an isolated ACL injury and a complex multi-ligamentous knee injury which increases case complexity.

Billing Focus: Identifying isolated vs. multi-ligament injuries prevents overcoding and ensures accurate primary diagnosis selection.

Document the mechanism of injury to support the traumatic nature of the sprain.

Example: Patient reports the right knee gave out during a sudden change of direction while running. The injury is non-contact in nature. Immediate onset of effusion noted within 2 hours of the event. Billing Focus: Provides clinical evidence of trauma to support S83 category codes. Risk Adjustment: Differentiates traumatic sprain from chronic or degenerative joint laxity.

Billing Focus: Mechanism documentation supports the use of injury codes rather than degenerative or chronic condition codes.

Relevant CPT Codes

Related Diagnoses

Hierarchy