ICD-10-CM 2027
ICD-10 code for lung aneurysm
From the official ICD-10-CM alphabetic index entry “Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › lung (pulmonary artery)”. Page updated September 29, 2026.
About coding lung aneurysm
The ICD-10-CM code for lung aneurysm is I28.1 (Aneurysm of pulmonary artery).
Within I28 (other diseases of pulmonary vessels), I28.1 is specifically for aneurysm of pulmonary artery. Related codes cover arteriovenous fistula of pulmonary vessels (I28.0), other diseases of pulmonary vessels (I28.8) and disease of pulmonary vessels, unspecified (I28.9).
Don't report I28.1 together with the conditions in its Excludes1 note: congenital aneurysm (Q25.79) and congenital arteriovenous aneurysm (Q25.72).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Don't confuse with (Excludes1 for I28.1)
Common questions about lung aneurysm ICD-10 codes
What is the ICD-10 code for lung aneurysm?
- I28.1 — Aneurysm of pulmonary artery.
Is I28.1 billable?
- Yes. I28.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I28.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I28.1 as a principal diagnosis.
Is I28.1 a CC or MCC?
- I28.1 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.