This condition is commonly documented along with chronic kidney disease (CKD). MBD is a broad term used to describe a group of bone disorders of bone strength usually caused by mineral abnormalities such as calcium, phosphorus, vitamin D, or magnesium. As published in Coding Clinic, Second Quarter 2022, when MBD is a component of another disease process, only the underlying condition (e.g., secondary hyperparathyroidism or renal osteodystrophy) is coded. If no underlying condition is documented, code the appropriate code from subcategory M89.8X-.