Secondary Hypothyroidism ICD-10-CM Codes

Use a secondary hypothyroidism ICD-10 code when a confirmed diagnosis is made based on clinical evaluation and laboratory findings showing central (not primary) origin. Document the underlying cause, such as a tumor, surgical history, or medication-induced suppression.

Treatments include thyroid hormone replacement, primarily levothyroxine, and addressing the root cause, such as surgical intervention for pituitary tumors or stopping causative medications. Long-term endocrine follow-up is recommended.

This code indicates a form of hypothyroidism stemming from inadequate TSH production due to pituitary or hypothalamic dysfunction. It informs both clinical management and insurance billing by identifying the condition’s central origin.