I78.8 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupI78.8

Effective 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)

I78.8

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

Other diseases of capillaries

Other conditions affecting the smallest blood vessels (capillaries) that are not classified elsewhere.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

I78Diseases of capillaries I78.8Other diseases of capillaries

Inclusion Terms

Official

No inclusion terms are included in this display for I78.8. Check the code and parent instructions in the Code Book.

Excludes 2

Official

certain conditions originating in the perinatal period (P04-P96)Inherited from I00-I99
certain infectious and parasitic diseases (A00-B99)Inherited from I00-I99
complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from I00-I99
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from I00-I99
endocrine, nutritional and metabolic diseases (E00-E88)Inherited from I00-I99
injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from I00-I99
neoplasms (C00-D49)Inherited from I00-I99
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from I00-I99
systemic connective tissue disorders (M30-M36)Inherited from I00-I99
transient cerebral ischemic attacks and related syndromes (G45.-)Inherited from I00-I99

Related Codes

Official

I78.0Hereditary hemorrhagic telangiectasia I78.1Nevus, non-neoplastic I78.9Disease of capillaries, unspecified

Includes

Official

No Includes notes are included in this display for I78.8. Check the code and parent instructions in the Code Book.

Excludes 1

Official

No Excludes 1 notes are included in this display for I78.8. Check the code and parent instructions in the Code Book.

Code First

Official

No Code First sequencing instructions are included in this display for I78.8. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for I78.8. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for I78.8. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Document the specific capillary disorder to support medical necessity

This is a residual category; use only when no more specific capillary disease code applies

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 I78.8 an HCC code?

No. I78.8 is a billable ICD-10-CM code with no mapping under the current CMS-HCC V28 community payment model, and none under the ESRD, Part D RxHCC, or HHS-HCC models.

Code: I78.8
Description: Other diseases of capillaries
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

Coder workflow notes

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What This Code Means

I78.8 is the ICD-10-CM diagnosis code for other diseases of capillaries. Other conditions affecting the smallest blood vessels (capillaries) that are not classified elsewhere. I78.8 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).

I78.8 is a billable ICD-10-CM code, but no current CMS-HCC V28 community payment mapping is shown, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

Document the specific capillary disorder to support medical necessity.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for I78.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document the specific capillary disorder to support medical necessity
•This is a residual category; use only when no more specific capillary disease code applies