Labrum (glenoid / acetabular)

In the shoulder, the glenoid labrum encircles the periphery of the glenoid fossa, effectively doubling the depth of a socket that is otherwise quite flat relative to the humeral head. It also serves as the attachment point for the glenohumeral ligaments and the long head of the biceps tendon. Injury patterns are location-specific: superior labrum anterior-to-posterior (SLAP) tears involve the 10-to-2-o'clock zone where the biceps anchor inserts, while Bankart lesions affect the anteroinferior labrum and are the most common structural correlate of traumatic anterior instability.

In the hip, the acetabular labrum lines the rim of the acetabulum and provides a fluid seal that distributes load across the cartilage surface. Labral tears here most often arise from femoroacetabular impingement (FAI)—either a cam lesion on the femoral head-neck junction, a pincer lesion from excessive acetabular coverage, or both. These mechanical causes must be addressed surgically alongside any labral repair or reconstruction to prevent recurrence.

Clinically and from a coding standpoint, glenoid and acetabular labral pathology occupy entirely separate anatomical regions with distinct procedure families. Shoulder labral work is coded under arthroscopic shoulder CPT codes (e.g., 29807 for repair), while hip labral work uses hip arthroscopy codes (e.g., 29916 for repair). Conflating the two—or failing to document which structure is involved, which side, and whether the procedure is debridement versus repair—creates claim exposure and audit risk.

Specificity in labrum documentation directly determines reimbursement level and audit defensibility. Debridement of a frayed labrum (CPT 29822 for shoulder; 29862 for hip) carries a lower relative value than a formal repair (CPT 29807 for shoulder; 29916 for hip), and payers will down-code or deny a repair claim if operative notes describe only tissue removal without anchoring or reattachment. On the diagnosis side, ICD-10-CM requires laterality and encounter type: using an unspecified-side code (e.g., S43.439A) when operative records clearly document the right shoulder is a red flag on RAC and commercial audits. For hip labral tears, failing to link the labral diagnosis to an underlying FAI diagnosis can make the surgical necessity argument harder to support under medical-necessity review.