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ICD-10-CM 2027

ICD-10 code for pulmonary aneurysm

I28.1

Aneurysm of pulmonary artery

✓ Billable / specificCC — complication/comorbidity

From the official ICD-10-CM alphabetic index entry “Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › pulmonary”. Page updated September 29, 2026.

About coding pulmonary aneurysm

The ICD-10-CM code for pulmonary aneurysm is I28.1 (Aneurysm of pulmonary artery). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I28.1.

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.

More specific pulmonary aneurysm codes (official index)

  • arteriovenous Q25.72 — Congenital pulmonary arteriovenous malformation
  • acquired I28.0 — Arteriovenous fistula of pulmonary vessels
  • syphilitic A52.09 — Other cardiovascular syphilis
  • valve (heart)

Don't confuse with (Excludes1 for I28.1)

  • congenital aneurysm (Q25.79)
  • congenital arteriovenous aneurysm (Q25.72)

Common questions about pulmonary aneurysm ICD-10 codes

What is the ICD-10 code for pulmonary aneurysm?

I28.1 — Aneurysm of pulmonary artery. More specific codes apply when the documentation supports them: Q25.72, I28.0, A52.09.

What is the ICD-10 code for arteriovenous pulmonary aneurysm?

Q25.72 — Congenital pulmonary arteriovenous malformation.

What is the ICD-10 code for syphilitic pulmonary aneurysm?

A52.09 — Other cardiovascular syphilis.

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.