What is ICD-10 code I79.8?

I79.8 is the ICD-10-CM diagnosis code for Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere. It belongs to the ICD-10-CM chapter for diseases of the circulatory system (i00-i99). I79.8 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. I79.8 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. I79.8 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. I79.8 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does I79.8 map to under V28?

I79.8 does not map to a CMS-HCC V28 payment category. Check the current CMS-HCC V28 model file for payment year 2026 rather than an older V24 tip sheet.

What does I79.8 pay in RAF?

I79.8 has no separately stated V28 community RAF weight. If it is not a V28 payment HCC, it adds nothing to a community RAF score.

What is the V28 vs V24 difference for I79.8?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. I79.8 was a payment HCC under V24 (Vascular Disease) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What documentation supports I79.8?

This is a secondary code that requires identification of the underlying disease causing the vascular damage; always code the primary condition first Review the medical record carefully to identify which classified disease is responsible for the arterial, arteriolar, or capillary disorder before assigning this code Because I79.8 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score. See the MEAT criteria checklist at /meat-criteria for what Monitor, Evaluate, Assess, or Treat looks like in a note. MEAT is generic documentation evidence, not a payer-specific rule.

2026 ICD-10-CM I79.8: Other disorders of arteries

I79.8 is not a CMS-HCC payment code. MEAT criteria · RAF calculator · free HCC coding tools

ICD-10-CM Code View

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Code lookupI79.8Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Diseases of arteries, arterioles and capillaries (I70-I79)

I79.8

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere

This code describes various blood vessel disorders (affecting arteries, small arteries, or tiny capillaries) that occur as a complication of another disease listed elsewhere in the medical record. It is used when the primary condition causes secondary damage to these blood vessels.

Buddy Insight

Other disorders of arteries, arterioles, and capillaries in diseases classified elsewhere captures vascular manifestations secondary to underlying systemic diseases not covered by I79.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Mapped

HCC 108

Vascular Disease

RAF 0.288

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

Mapped

HCC 108

Vascular Disease

RAF 0.073

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

I79Disorders of arteries, arterioles and capillaries in diseases classified elsewhere

I79.8Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for I79.8 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for I79.8 in this effective period.

Related Child Codes

Official

I79.0Aneurysm of aorta in diseases classified elsewhere

I79.1Aortitis in diseases classified elsewhere

Includes

Official

ICD-10-CM does not list Includes notes for I79.8 in this effective period.

Excludes 1

Official

diabetic (peripheral) angiopathy (E08-E13 with .51-.52)
syphilitic endarteritis (A52.09)
tuberculous endarteritis (A18.89)

Code First

Official

underlying disease, such as:
amyloidosis (E85.-)

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for I79.8 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for I79.8 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of the specific arterial, arteriolar, or capillary disorder

Identification of the underlying causative disease (must be coded first)

Clinical or imaging evidence supporting the vascular manifestation

Assessment of the impact on affected organs or tissues

MEAT Support

HCC Buddy guidance

Documentation of the specific arterial, arteriolar, or capillary disorder

Identification of the underlying causative disease (must be coded first)

Clinical or imaging evidence supporting the vascular manifestation

Assessment of the impact on affected organs or tissues

Audit Caution

HCC Buddy guidance

Using this code without the required primary underlying disease code

Not distinguishing from primary arterial disorder codes (I77.x series)

Failing to recognize this as a manifestation code requiring dual coding

Using this code when more specific manifestation codes (I79.0, I79.1) are applicable

Common Mistakes

HCC Buddy guidance

I79.0 — Aneurysm of aorta in diseases classified elsewhere: specifically for aortic aneurysm manifestation

I79.1 — Aortitis in diseases classified elsewhere: specifically for aortic inflammation manifestation

I77.89 — Other specified disorders of arteries and arterioles: primary arterial condition, not secondary to another disease

I99.8 — Other disorder of circulatory system: broader circulatory manifestation code

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is I79.8 an HCC code?

Yes. I79.8 maps to Vascular Disease under the V24 model but is not retained in V28.

Code: I79.8
Description: Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

V24HCC 108, Vascular Disease

0.288

ESRDHCC 108, Vascular Disease

0.073

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work I79.8 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for I79.8

For I79.8 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed I79.8 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

I79.8 is the ICD-10-CM diagnosis code for other disorders of arteries, arterioles and capillaries in diseases classified elsewhere. This code describes various blood vessel disorders (affecting arteries, small arteries, or tiny capillaries) that occur as a complication of another disease listed elsewhere in the medical record. It is used when the primary condition causes secondary damage to these blood vessels. I79.8 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering diseases of arteries, arterioles and capillaries (i70-i79).

Under the older CMS-HCC V24 model, I79.8 maps to Vascular Disease (HCC 108) with a community, non-dual, aged base RAF weight of 0.288. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

This is a secondary code that requires identification of the underlying disease causing the vascular damage; always code the primary condition first. Because I79.8 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for I79.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This is a secondary code that requires identification of the underlying disease causing the vascular damage; always code the primary condition first
•Review the medical record carefully to identify which classified disease is responsible for the arterial, arteriolar, or capillary disorder before assigning this code

Clinical Significance

Other disorders of arteries, arterioles, and capillaries in diseases classified elsewhere captures vascular manifestations secondary to underlying systemic diseases not covered by I79.0 or I79.1. This manifestation code requires identification and primary sequencing of the underlying disease. It reflects the vascular complications of systemic conditions, contributing to overall patient complexity.

Documentation Requirements

✓Documentation of the specific arterial, arteriolar, or capillary disorder
✓Identification of the underlying causative disease (must be coded first)
✓Clinical or imaging evidence supporting the vascular manifestation
✓Assessment of the impact on affected organs or tissues
✓Treatment plan addressing both the underlying disease and vascular manifestation
✓Monitoring plan for vascular complications

Excludes 1, Do NOT code together

diabetic (peripheral) angiopathy (E08-E13 with .51-.52)
syphilitic endarteritis (A52.09)
tuberculous endarteritis (A18.89)

Code First

underlying disease, such as:
amyloidosis (E85.-)

Commonly Confused Codes

•I79.0: Aneurysm of aorta in diseases classified elsewhere: specifically for aortic aneurysm manifestation
•I79.1: Aortitis in diseases classified elsewhere: specifically for aortic inflammation manifestation
•I77.89: Other specified disorders of arteries and arterioles: primary arterial condition, not secondary to another disease
•I99.8: Other disorder of circulatory system: broader circulatory manifestation code

Child Codes

I79.0Aneurysm of aorta in diseases classified elsewhere

I79.1Aortitis in diseases classified elsewhere

I79.8Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere

Code Hierarchy

└I79Disorders of arteries, arterioles and capillaries in diseases classified elsewhere └I79.8Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere

└I79.8Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere

I79.8 ICD-10-CM Code: Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere

HCC Buddy Code Card

I79.8

Is I79.8 an HCC code?

HCC Category Mapping

MEAT Criteria for I79.8

Get the V28 RAF + MEAT cheat sheet

What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Excludes 1, Do NOT code together

Code First

Commonly Confused Codes

Child Codes

Code Hierarchy

Work I79.8 in HCC Buddy