ICD-10-CM Code For Diseases Of Capillaries: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group I78 includes capillary disorders such as capillary telangiectasia and other specified diseases of capillaries that affect microvascular integrity and perfusion. These ICD-10-CM diagnosis codes are used to document clinical presentations involving microvascular abnormalities, capturing disease distribution, severity, and related organ involvement. Accurate coding within the ICD-10-CM I78 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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ICD-10-CM I78: Diseases Of Capillaries Overview

The ICD-10-CM I78 group comprises disorders primarily affecting capillaries, the smallest blood vessels within the microcirculation. These diagnoses target microvascular pathology that can impact skin, mucous membranes, and various organs through capillary dysfunction. Accurate coding is important for complete clinical documentation and supports appropriate reimbursement for services related to diagnosis and management.

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ICD-10-CM Code For Diseases Of Capillaries: Group Overview

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ICD-10-CM I78: Diseases Of Capillaries Overview

When to Use

Use a code from the ICD-10-CM I78 group when documentation identifies a primary diagnosis of a capillary disorder such as capillary telangiectasia or another specified disease of capillaries. Select the code that best reflects the documented site, severity, and any complication or associated organ involvement described in the medical record.

ICD-10-CM Codes

4 rows

ICD-10-CM Code	Description
I78.0	Hereditary hemorrhagic telangiectasia
I78.1	Nevus, non-neoplastic
I78.8	Other diseases of capillaries
I78.9	Disease of capillaries, unspecified

DRG Codes

5 rows

DRG Code	Description
299	Peripheral Vascular Disorders with MCC
300	Peripheral Vascular Disorders with CC
301	Peripheral Vascular Disorders without CC/MCC
606	Minor Skin Disorders with MCC
607	Minor Skin Disorders without MCC

Typical Clinical Scenarios

An elderly patient presents to the clinic with progressive purple discoloration and pain in the fingertips and toes, intermittent ulceration on the tips of several fingers, and a history of chronic venous insufficiency. The clinician documents small vessel involvement with capillary fragility and microvascular changes as the primary finding after physical exam and bedside capillary refill testing, prompting assignment of a capillary disease code to capture the microvascular pathology. Typical codes: I78.0, I78.9
A middle-aged patient with longstanding autoimmune connective tissue disease reports new-onset widespread petechiae and easy bruising without a clear coagulopathy; laboratory evaluation rules out platelet disorders and suggests capillary leakage related to systemic microvascular inflammation. Because the presentation reflects capillary-level disease as a complication of the underlying systemic condition, a code specific to capillary disorders is used to describe the microvascular process alongside the autoimmune diagnosis. Typical codes: I78.1, I78.8
A patient is evaluated in the emergency department after severe blunt trauma to the forearm, now exhibiting purple mottling and nonblanching skin changes in the affected area with concern for localized capillary injury and compromised microcirculation. The treating team documents capillary damage contributing to the limb’s ischemic appearance and assigns a capillary disease code to capture the acute microvascular injury as part of the trauma assessment. Typical codes: I78.9, I78.8

Related Codes

I70-ATHEROSCLEROSIS

ICD-10-CM Code For Atherosclerosis: Group Overview

I71-AORTIC-ANEURYSM-AND-DISSECTION

ICD-10-CM Code For Aortic Aneurysm And Dissection: Group Overview

I72-OTHER-ANEURYSM-PERIPHERAL-ARTERIES

ICD-10-CM Code For Other Aneurysm: Group Overview

I73-OTHER-PERIPHERAL-VASCULAR-DISEASES

ICD-10-CM Code For Other Peripheral Vascular Diseases: Group Overview

I74-ARTERIAL-EMBOLISM-AND-THROMBOSIS

ICD-10-CM Code For Arterial Embolism And Thrombosis: Group Overview

I75-ATHEROEMBOLISM

ICD-10-CM Code For Atheroembolism: Group Overview

I76-SEPTIC-ARTERIAL-EMBOLISM

ICD-10-CM Code For Septic Arterial Embolism: Group Overview

I77-OTHER-DISORDERS-OF-ARTERIES-AND-ARTERIOLES

ICD-10-CM Code For Other Disorders Of Arteries And Arterioles: Group Overview

I79-DISORDERS-OF-ARTERIES-ARTERIOLES-CAPILLARIES

ICD-10-CM Code For Disorders Of Arteries Arterioles And Capillaries In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

4 rows

ICD-10-CM Code	Description
I78.0	Hereditary hemorrhagic telangiectasia
I78.1	Nevus, non-neoplastic
I78.8	Other diseases of capillaries
I78.9	Disease of capillaries, unspecified

DRG Codes

5 rows

DRG Code	Description
299	Peripheral Vascular Disorders with MCC
300	Peripheral Vascular Disorders with CC
301	Peripheral Vascular Disorders without CC/MCC
606	Minor Skin Disorders with MCC
607	Minor Skin Disorders without MCC

Typical Clinical Scenarios

An elderly patient presents to the clinic with progressive purple discoloration and pain in the fingertips and toes, intermittent ulceration on the tips of several fingers, and a history of chronic venous insufficiency. The clinician documents small vessel involvement with capillary fragility and microvascular changes as the primary finding after physical exam and bedside capillary refill testing, prompting assignment of a capillary disease code to capture the microvascular pathology. Typical codes: I78.0, I78.9
A middle-aged patient with longstanding autoimmune connective tissue disease reports new-onset widespread petechiae and easy bruising without a clear coagulopathy; laboratory evaluation rules out platelet disorders and suggests capillary leakage related to systemic microvascular inflammation. Because the presentation reflects capillary-level disease as a complication of the underlying systemic condition, a code specific to capillary disorders is used to describe the microvascular process alongside the autoimmune diagnosis. Typical codes: I78.1, I78.8
A patient is evaluated in the emergency department after severe blunt trauma to the forearm, now exhibiting purple mottling and nonblanching skin changes in the affected area with concern for localized capillary injury and compromised microcirculation. The treating team documents capillary damage contributing to the limb’s ischemic appearance and assigns a capillary disease code to capture the acute microvascular injury as part of the trauma assessment. Typical codes: I78.9, I78.8

Related Codes

I70-ATHEROSCLEROSIS

ICD-10-CM Code For Atherosclerosis: Group Overview

I71-AORTIC-ANEURYSM-AND-DISSECTION

ICD-10-CM Code For Aortic Aneurysm And Dissection: Group Overview

I72-OTHER-ANEURYSM-PERIPHERAL-ARTERIES

ICD-10-CM Code For Other Aneurysm: Group Overview

I73-OTHER-PERIPHERAL-VASCULAR-DISEASES

ICD-10-CM Code For Other Peripheral Vascular Diseases: Group Overview

I74-ARTERIAL-EMBOLISM-AND-THROMBOSIS

ICD-10-CM Code For Arterial Embolism And Thrombosis: Group Overview

I75-ATHEROEMBOLISM

ICD-10-CM Code For Atheroembolism: Group Overview

I76-SEPTIC-ARTERIAL-EMBOLISM

ICD-10-CM Code For Septic Arterial Embolism: Group Overview

I77-OTHER-DISORDERS-OF-ARTERIES-AND-ARTERIOLES

ICD-10-CM Code For Other Disorders Of Arteries And Arterioles: Group Overview

I79-DISORDERS-OF-ARTERIES-ARTERIOLES-CAPILLARIES

ICD-10-CM Code For Disorders Of Arteries Arterioles And Capillaries In Diseases Classified Elsewhere: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Diseases Of Capillaries: Group Overview

Sign up for ICD-10-CM Code For Diseases Of Capillaries: Group Overview policy alerts

ICD-10-CM I78: Diseases Of Capillaries Overview

ICD-10-CM Code For Diseases Of Capillaries: Group Overview

Sign up for ICD-10-CM Code For Diseases Of Capillaries: Group Overview policy alerts

ICD-10-CM I78: Diseases Of Capillaries Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which diagnoses are included in the ICD-10-CM I78 group?

What clinical features do I78 codes document?

How does accurate coding in the I78 group affect reimbursement?

Which DRGs are related to the I78 capillary disease codes?

Which specific code should be used when the capillary disease is unspecified?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which diagnoses are included in the ICD-10-CM I78 group?

What clinical features do I78 codes document?

How does accurate coding in the I78 group affect reimbursement?

Which DRGs are related to the I78 capillary disease codes?

Which specific code should be used when the capillary disease is unspecified?

References