I79.0
Aneurysm of aorta in diseases classified elsewhere
I79.0 (also written I790) is a billable ICD-10-CM diagnosis code for aneurysm of aorta in diseases classified elsewhere. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 3 codes in category I79 (Disorders of arteries, arterioles and capillaries in diseases classified elsewhere). The Alphabetic Index lists it under 2 entries. Its coding notes include a Code first instruction, 1 Excludes1 entry and 10 Excludes2 entries.
Code first
If the underlying condition listed here is present and known, sequence it first.
- underlying disease
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- syphilitic aneurysm (A52.01)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Hospice: not accepted as primary
Not accepted as the principal diagnosis on a hospice claim (bill types 081x and 082x). The Integrated OCE returns an edit for this code.
Reason: Manifestation code. Report the underlying condition first (see the Code first note).
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 2 entries