E08.9

HCC Category Mapping

What This Code Means

This code describes diabetes that has developed as a result of another medical condition (such as pancreatitis, cystic fibrosis, or hemochromatosis) and currently has no complications. The diabetes is secondary to the underlying disease rather than being primary Type 1 or Type 2 diabetes.

Coding Tips

• •Always code the underlying condition first (such as pancreatitis or cystic fibrosis), then use E08.9 to indicate the secondary diabetes without complications
• •If complications develop (such as neuropathy, nephropathy, or retinopathy), use a more specific E08 code with the appropriate complication digit rather than E08.9

Clinical Significance

Diabetes mellitus due to an underlying condition without complications captures secondary diabetes that is currently well-managed without end-organ damage. The diabetes is not primary Type 1 or Type 2 but instead arises from diseases like pancreatitis, cystic fibrosis, Cushing syndrome, or hemochromatosis. Even without complications, this diagnosis requires ongoing monitoring because the underlying disease may worsen glycemic control over time.

Documentation Requirements

• ✓The underlying causative condition must be identified and coded first per ICD-10-CM sequencing rules.
• ✓Documentation should explicitly state that no diabetic complications (nephropathy, retinopathy, neuropathy, etc.) are present at the time of the encounter.
• ✓The clinical note should include current glucose management status and any monitoring plans.

Commonly Confused Codes