2027 ICD-10-CM Diagnosis Code I72.0Aneurysm of carotid artery
ICD-10-CM Codes›I00–I99›I70-I79›I72
- Billable — Valid for Submission
- Chronic Condition
I72.0 is a billable ICD-10-CM diagnosis code for aneurysm of carotid artery. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 299 through 301. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Aortic; peripheral; and visceral artery aneurysms.
I72.0 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 108 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 108, ESRD (V21) category 108, and ESRD (V24) category 108 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I72.0 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Aneurysm of artery of neck
- Aneurysm of common carotid artery
- Aneurysm of external carotid artery
- Aneurysm of extracranial portion of internal carotid artery
- Aneurysm of extracranial portion of left internal carotid artery
- Aneurysm of extracranial portion of right internal carotid artery
- Aneurysm of head and neck artery
- Aneurysm of left carotid artery
- Aneurysm of left common carotid artery
- Aneurysm of left internal carotid artery
- Aneurysm of right carotid artery
- Aneurysm of right common carotid artery
- Aneurysm of right internal carotid artery
- Aneurysm of superficial temporal artery
- Carotid artery aneurysm
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I72.0: its own notes plus those printed at I72 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- aneurysm (cirsoid) (false) (ruptured)
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Aneurysm of common carotid artery
- Aneurysm of external carotid artery
- Aneurysm of internal carotid artery, extracranial portion
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- acquired aneurysm (I77.0)
- aneurysm (of) aorta (I71.-)
- aneurysm (of) arteriovenous NOS (Q27.3-)
- carotid artery dissection (I77.71)
- cerebral (nonruptured) aneurysm (I67.1)
- coronary aneurysm (I25.4)
- coronary artery dissection (I25.42)
- dissection of artery NEC (I77.79)
- dissection of precerebral artery, congenital (nonruptured) (Q28.1)
- heart aneurysm (I25.3)
- iliac artery dissection (I77.72)
- precerebral artery, congential (nonruptured) (Q28.1)
- pulmonary artery aneurysm (I28.1)
- renal artery dissection (I77.73)
- retinal aneurysm (H35.0)
- ruptured cerebral aneurysm (I60.7)
- varicose aneurysm (I77.0)
- vertebral artery dissection (I77.74)
- 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.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name I72.0, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming I72.0: they are not reported together with it, unless the two conditions are unrelated.
- Q28 Other congenital malformations of circulatory systemruptured malformation of precerebral vessels (I72.0)
Excludes2 2
These codes carry an Excludes2 note naming I72.0: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Carotid Artery Aneurysm
aneurysm of the carotid artery.
Patient EducationClinical
Aneurysms
An aneurysm is a bulge or "ballooning" in the wall of an artery. Arteries are blood vessels that carry oxygen-rich blood from the heart to other parts of the body. If an aneurysm grows large, it can burst and cause dangerous bleeding or even death.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I72.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I72.0Overview
What is the ICD-10 code for aneurysm of carotid artery?
The ICD-10-CM code for aneurysm of carotid artery is I72.0 (sometimes written as I720). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I72.0 (Other aneurysm) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report aneurysm of carotid artery on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I72.0 group to?
When aneurysm of carotid artery is the principal diagnosis on an inpatient stay, it groups to MS-DRG 301, 300, 299, with relative weights from 0.7132 to 1.5840 depending on complications. Higher weights mean higher Medicare reimbursement.
Can I72.0 be reported with I67.1?
Not as a rule. The Excludes1 note on I72.0 lists "aneurysm of internal carotid artery, intracranial portion (I67.1)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of I72.0?
Under the General Equivalence Mappings, aneurysm of carotid artery converts to ICD-9-CM 442.81 (aneurysm of neck). The mapping is approximate, so confirm the match fits the documentation.
Does I72.0 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. I72.0 mapped to HCC 108 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 108 (Vascular Disease), ESRD (V21) category 108 (Vascular Disease), and ESRD (V24) category 108 (Vascular Disease).
