ICD-10 Code I78.9 – Disease of capillaries, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I78.9 – Disease of capillaries, unspecified
What it is
I78.9 identifies a capillary disorder when the record confirms disease of the capillaries but does not specify the exact type. Use it for an unspecified capillary condition rather than a more defined vascular diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Findings may include visible capillary abnormalities, skin discoloration, or other signs of small-vessel involvement, but the note should support a capillary disease diagnosis.
When to use this code
Use I78.9 when the clinician documents disease of the capillaries and no further detail is available. It is appropriate when the chart does not name a specific capillary disorder or when the diagnosis remains nonspecific after evaluation.
Do not use for
Do not use this code for disorders clearly documented as involving arteries, veins, or lymphatic vessels. If the record identifies a more specific capillary condition, code that diagnosis instead.
Coding tip
Check documentation for a more precise vascular diagnosis before assigning I78.9.