Diseases of capillaries (I78) ICD-10-CM
The I78 code range covers diseases of capillaries with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the I78 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I78 range.
Capillary Leak Syndrome
A condition characterized by recurring episodes of fluid leaking from capillaries into extra-vascular compartments causing hematocrit to rise precipitously. If not treated, generalized vascular leak can lead to generalized EDEMA; SHOCK; cardiovascular collapse; and MULTIPLE ORGAN FAILURE.
About the I78 Code Range
The ICD-10 code I78 covers diseases affecting capillaries, the tiny blood vessels responsible for exchanging oxygen and nutrients with tissues. This section includes specific codes for hereditary and acquired capillary disorders.
Codes like I78.0 identify hereditary hemorrhagic telangiectasia, known also as Osler syndrome, which involves abnormal blood vessel formation and bleeding risk. The I78.1 code applies to various non-neoplastic nevi and telangiectasia, including spider veins and skin-related vascular abnormalities often called "spider telangiectasis." I78.8 captures other diseases such as capillary thrombosis and pulmonary capillary hemangiomatosis, conditions marked by capillary blockage or abnormal proliferation. When the specific capillary disease is unknown, I78.9 is used for unspecified capillary diseases, which may present as dilated blood vessels or reactive skin vascular changes.
These codes help medical coders accurately classify diverse capillary conditions, providing clarity for diagnoses involving hereditary syndromes, skin telangiectasias, or complex microvascular disorders. Understanding synonyms like "spider nevus" or "Osler hemorrhagic telangiectasia syndrome" guides correct coding with ICD-10 code for hereditary hemorrhagic telangiectasia (I78.0) or non-neoplastic telangiectasia (I78.1).
Questions About This Page
How many billable codes are in the I78 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I78 range classify?
The range classifies diseases of capillaries. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
