ICD-10 Code for Vitamin D Deficiency: E55.9 Explained

Vitamin D is essential for bone health, immune function, and calcium balance, yet deficiencies are common and clinically significant. Providers must code deficiency accurately to support clinical care, reimbursement, and compliance. In this comprehensive guide, we break down the ICD-10 code for Vitamin D deficiency, including the primary code E55.9 (Vitamin D deficiency, unspecified) and relevant subcodes (e.g. for rickets). You’ll learn why precise documentation matters, common pitfalls in coding, best practices for capturing underlying causes, lab values, and how to avoid claim denials. We also explore clinical scenarios (primary care, pediatrics, geriatrics) and how a specialized coding partner like Allzone Management Services can help streamline medical coding, ensure compliance, and maximize revenue. Whether you’re a coder, clinician, or billing professional, this guide equips you to code Vitamin D deficiency effectively and confidently.