M11.059 Hydroxyapatite deposition disease, unspecified hip

Name of the Condition

• Hydroxyapatite deposition disease, unspecified hip

Summary

Hydroxyapatite deposition disease (HADD) of the unspecified hip is a condition characterized by the deposition of calcium phosphate crystals (hydroxyapatite) in soft tissues around the hip joint, leading to inflammation and pain. It typically affects periarticular structures such as tendons, ligaments, or bursae and may present with acute symptoms. The condition can cause significant discomfort and functional impairment, though it often resolves spontaneously over time.

Causes

HADD is caused by the deposition of hydroxyapatite crystals in soft tissues around the hip. The exact trigger for crystal formation is not fully understood, but it may occur spontaneously or in association with trauma, overuse, or metabolic conditions. The crystals can provoke an inflammatory response, contributing to symptoms.

Risk Factors

• Repetitive hip motion or overuse.
• Trauma to the hip joint.
• Metabolic disorders (e.g., diabetes, hyperparathyroidism).
• Advanced age.
• Chronic kidney disease.

Symptoms

• Sudden, severe pain in the hip.
• Swelling and tenderness around the hip.
• Limited range of motion.
• Warmth or redness over the hip.
• Pain that worsens with movement or weight-bearing.

Diagnosis

Diagnosis is based on clinical presentation, including sudden onset of pain and tenderness in the hip. Imaging (e.g., X-rays, ultrasound) may show calcific deposits. Joint aspiration is rarely performed but can reveal crystals if done. Exclusion of other conditions (e.g., infection, gout) is important.

Treatment Options

• Rest and activity modification to reduce hip stress.
• Nonsteroidal anti-inflammatory drugs (NSAIDs) for pain and inflammation.
• Corticosteroid injections for severe or persistent symptoms.
• Physical therapy to improve range of motion and strength.
• In rare cases, surgical intervention for calcific deposits.

Prognosis and Follow-Up

Most cases resolve spontaneously within weeks to months. Symptoms often improve with conservative management. Follow-up may involve monitoring for recurrence or complications, especially if underlying metabolic conditions are present.

Complications

• Chronic pain or residual stiffness.
• Recurrent episodes.
• Limited mobility or functional impairment.
• Rarely, calcific deposits may require surgical removal.

Lifestyle & Prevention

• Avoid repetitive hip movements or overuse.
• Maintain a healthy weight to reduce hip stress.
• Manage underlying metabolic conditions (e.g., diabetes, kidney disease).
• Use proper techniques during physical activity to prevent trauma.

When to Seek Professional Help

Seek care if hip pain is severe, sudden, or worsening, or if accompanied by swelling, redness, or fever. Prompt evaluation is important to rule out other conditions like infection or fracture.

Tips for Medical Coders

Document the site (unspecified hip) and clinical details supporting the diagnosis. Ensure the code aligns with the patient’s clinical presentation and any imaging or lab findings. Note that "unspecified" indicates the hip site was not further specified in the record.