Hydroxyapatite deposition disease, multiple sites

This code signifies a condition characterized by the abnormal deposition of calcium hydroxyapatite crystals in periarticular soft tissues, leading to inflammation and pain. It specifically indicates that these deposits are present in multiple anatomical locations throughout the body.

Use this code when documentation clearly states a diagnosis of hydroxyapatite deposition disease affecting more than one joint or site. Supporting documentation would include imaging reports (e.g., X-rays, ultrasound) showing calcifications in multiple periarticular tissues, along with clinical notes detailing associated symptoms like pain and limited range of motion.

• Ensure the documentation explicitly states "multiple sites" or lists several affected areas to justify this code.
• Do not use this code if only a single site is affected; instead, use the appropriate site-specific code (e.g., M11.011 for shoulder).
• Consider sequencing this code as a primary diagnosis if it is the main reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting treatment.