I77.6 Arteritis, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Aortitis NOS
• Endarteritis NOS

Excludes1 (never code together)

• arteritis or endarteritis:
• aortic arch (M31.4)
• cerebral NEC (I67.7)
• coronary (I25.89)
• deformans (I70.-)
• giant cell (M31.5, M31.6)
• obliterans (I70.-)
• senile (I70.-)

Applies from I77 Other disorders of arteries and arterioles

Excludes2 (not included here)

• collagen (vascular) diseases (M30-M36)
• hypersensitivity angiitis (M31.0)
• pulmonary artery (I28.-)

Risk adjustment (HCC)

• CMS-HCC V22: HCC 108 — Vascular Disease
• ESRD V24: HCC 108

MS-DRG index

Defines the logic of DRG(s) 545-547 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 447.6 Arteritis, unspecified

Diagnosis Index entries for I77.6

• Angiitis
• Aortitis (nonsyphilitic) (calcific)
• Arteriolitis
• Arteritis
• Arteritis › aorta (nonsyphilitic)
• Endarteritis (bacterial, subacute) (infective)
• Vasculitis
• Vasculitis › disseminated

Nearby codes

• I77.1 Stricture of artery
• I77.2 Rupture of artery
• I77.3 Arterial fibromuscular dysplasia
• I77.4 Celiac artery compression syndrome
• I77.5 Necrosis of artery
• I77.6 Arteritis, unspecified (this code)
• I77.7 Other arterial dissection
• I77.70 Dissection of unspecified artery
• I77.71 Dissection of carotid artery
• I77.72 Dissection of iliac artery
• I77.73 Dissection of renal artery