ICD-10-CM 2027
ICD-10 code for capillaries disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › capillaries”. Page updated September 29, 2026.
About coding capillaries disease
The ICD-10-CM code for capillaries disease is I78.9 (Disease of capillaries, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on I78.9.
Within I78, choose I78.9 (Disease of capillaries, unspecified) only when documentation doesn't support a more specific option: hereditary hemorrhagic telangiectasia (I78.0), nevus, non-neoplastic (I78.1) and other diseases of capillaries (I78.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 299 (Peripheral Vascular Disorders with MCC, relative weight 1.5842), DRG 300 (Peripheral Vascular Disorders with CC, relative weight 1.0464) and DRG 301 (Peripheral Vascular Disorders without CC/MCC, relative weight 0.7133), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific capillaries disease codes (official index)
- specified NEC I78.8 — Other diseases of capillaries
Common questions about capillaries disease ICD-10 codes
What is the ICD-10 code for capillaries disease?
- I78.9 — Disease of capillaries, unspecified. More specific codes apply when the documentation supports them: I78.8.
Is I78.9 billable?
- Yes. I78.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I78.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I78.9 as a principal diagnosis.
Is I78.9 a CC or MCC?
- No. I78.9 is neither a CC nor an MCC under MS-DRG v44.0.