2026 ICD-10-CM Diagnosis Code I78.8Other diseases of capillaries

ICD-10-CM Codes›I00–I99›I70-I79›I78

ICD-10-CM I78.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I78.8 is a billable ICD-10-CM diagnosis code for other diseases of capillaries. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified circulatory disease.

Code Identity

ICD-10-CM Code
I78.8
Billable Status
Yes — Valid for Submission
Code Describes
Other diseases of capillaries
Short Description
Other diseases of capillaries
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 CodeI78.8Other diseases of capillaries

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired hemangiomatosis
  • Capillaritis
  • Capillaritis caused by drug
  • Capillary hemorrhage
  • Capillary hyperpermeability
  • Capillary leak syndrome
  • Capillary thrombosis
  • Decreased capillary fragility
  • Decreased capillary resistance
  • Decreased vascular resistance
  • Dilated capillaries
  • Edema of soft tissue due to increased capillary pressure
  • Familial pulmonary capillary hemangiomatosis
  • Idiopathic capillaritis
  • Increased blood vessel permeability
  • Increased capillary permeability
  • Increased capillary resistance
  • Increased vascular resistance
  • Isolated pulmonary capillaritis
  • Multiple progressive hemangiomata
  • Necrosis of capillary of kidney due to glomerular disease
  • Occlusion of cutaneous microvasculature structure by cardiac embolus
  • Occlusion of microvasculature of skin caused by cryoglobulin type III
  • Occlusion of microvasculature of skin caused by embolus
  • Occlusion of microvasculature of skin caused by platelet plug
  • Occlusion of microvasculature of skin due to coagulopathy
  • Occlusion of microvasculature of skin due to myeloproliferative disorder-associated platelet plugs
  • Occlusion of microvasculature of skin due to platelet thrombus associated with paroxysmal nocturnal hemoglobinuria
  • Platelet embolism
  • Pulmonary capillaritis
  • Pulmonary capillary hemangiomatosis
  • Pulmonary hypertension due to familial pulmonary capillary hemangiomatosis
  • Pulmonary hypertension due to pulmonary capillary hemangiomatosis
  • Strawberry nevus of skin
  • Sunburst telangiectases
  • Ulcero - mutilating hemangiomatosis

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.

    • Atonia, atony, atonic
      • capillary
    • Bleeding
      • capillary
    • Deformity
      • capillary (acquired)
    • Degeneration, degenerative
      • capillaries (fatty)
    • Dilatation
      • capillaries
    • Disease, diseased
      • capillaries
        • specified NEC
    • Ectasia, ectasis
      • capillary
    • Embolism(multiple) (paradoxical)
      • capillary
    • Hemangiomatosis(systemic)
    • Hemorrhage, hemorrhagic(concealed)
      • capillary
    • Hyperpermeability, capillary
    • Increase, increased
      • permeability, capillaries
    • Rupture, ruptured
      • capillaries
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • capillary

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

Clinical InformationClinical

  • 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.

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 I78.8 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 I78.8Overview

Is I78.8 (Diseases of capillaries) a billable code?

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

What MS-DRG does I78.8 group to?

When other diseases of capillaries 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 I78.8?

Under the General Equivalence Mappings, other diseases of capillaries 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.