2026 ICD-10-CM Diagnosis Code I78.9Disease of capillaries, unspecified

ICD-10-CM Codes›I00–I99›I70-I79›I78

ICD-10-CM I78.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I78.9 is a billable ICD-10-CM diagnosis code for disease of capillaries, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 299 through 301. Coders also document this condition as acroangiodermatitis of skin. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified circulatory disease.

Code Identity

ICD-10-CM Code
I78.9
Billable Status
Yes — Valid for Submission
Code Describes
Disease of capillaries, unspecified
Short Description
Disease of capillaries, unspecified
Same as the full description in the CMS dataset.
Parent Code
I78
Diseases of capillaries

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI70-I79Diseases of arteries, arterioles and capillaries
CategoryI78Diseases of capillaries
This CodeI78.9Disease of capillaries, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acroangiodermatitis of skin
  • Dilated blood vessels in skin
  • Disorder of capillaries
  • Reactive vascular proliferation of skin

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Acroangiodermatitis
    • Disease, diseased
      • capillaries

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR032
Other specified and unspecified circulatory disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Vascular Diseases

Your vascular system is your body's network of blood vessels. It includes your:

The full article covers:

  • What are vascular diseases?
  • What causes vascular diseases?
  • Who is at risk for vascular diseases?
  • What are the symptoms of vascular diseases?
  • How are vascular diseases diagnosed?
  • How are vascular diseases treated?
  • Can vascular diseases be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert I78.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
448.9 Capillary dis NEC/NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I78.9Overview

Is I78.9 (Diseases of capillaries) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disease of capillaries, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I78.9 group to?

When disease of capillaries, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 299, 300, 301, with relative weights from 0.7197 to 1.6327 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I78.9?

Under the General Equivalence Mappings, disease of capillaries, unspecified converts to ICD-9-CM 448.9 (capillary dis NEC/NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.