2027 ICD-10-CM Diagnosis Code I77.72Dissection of iliac artery

ICD-10-CM Codes›I00–I99›I70-I79›I77

ICD-10-CM I77.72
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I77.72 is a billable ICD-10-CM diagnosis code for dissection of iliac 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. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 10 closely related codes. Coders also document this condition as bilateral dissection of iliac arteries. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Arterial dissections.

I77.72 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 107 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 107, ESRD (V21) category 107, and ESRD (V24) category 107 for payment year 2027.

Code Identity

ICD-10-CM Code
I77.72
Billable Status
Yes — Valid for Submission
Code Describes
Dissection of iliac artery
Short Description
Dissection of iliac artery
Same as the full description in the CMS dataset.
Parent Code
I77.7
Other arterial dissection

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI70-I79Diseases of arteries, arterioles and capillaries
CategoryI77Other disorders of arteries and arterioles
This CodeI77.72Dissection of iliac artery

Medicare Risk Adjustment (HCC)Billing

I77.72 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.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
Dropped in V28 see all codes that no longer risk-adjust
Prior Model (CMS-HCC V24)
HCC 107
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 107 · ESRD (V21): HCC 107 · ESRD (V24): HCC 107
ESRD V21 weights: 0.126 dialysis, 0.300–0.431 functioning graft · ESRD V24 weights: 0.144 dialysis, 0.324–0.586 functioning graft
Part D (RxHCC)
Not mapped
I77.72 does not risk-adjust in the RxHCC prescription drug model

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.

  • Bilateral dissection of iliac arteries
  • Dissection of artery of lower limb
  • Dissection of femoral artery
  • Dissection of iliac artery
  • Dissection of left iliac artery
  • Dissection of right iliac artery

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I77.72: its own notes plus those printed at I77.7, I77, and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

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.

From I77.7 Other arterial dissection applies to 9 codes
  • dissection of aorta (I71.0-)
  • dissection of coronary artery (I25.42)
From I77 Other disorders of arteries and arterioles applies to 23 codes
  • collagen (vascular) diseases (M30-M36)
  • hypersensitivity angiitis (M31.0)
  • pulmonary artery (I28.-)
From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • 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 I77.72, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming I77.72: its condition is not part of those codes, and both may be reported when the patient has both.

  • I72 Other aneurysm
    iliac artery dissection (I77.72)

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.

CCSR CIR027
Arterial dissections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Dissection of Iliac Artery

    a tear within the wall of an iliac 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 I77.72 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
443.22 Dissection iliac artery
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I77.72Overview

What is the ICD-10 code for dissection of iliac artery?

The ICD-10-CM code for dissection of iliac artery is I77.72 (sometimes written as I7772). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is I77.72 (Other arterial dissection) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report dissection of iliac artery on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does I77.72 group to?

When dissection of iliac 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.

Is I77.72 a CC or MCC?

CMS lists I77.72 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 10 closely related codes in its exclusion list.

What is the ICD-9 equivalent of I77.72?

Under the General Equivalence Mappings, dissection of iliac artery converts to ICD-9-CM 443.22 (dissection iliac artery). The mapping is a direct match.

Does I77.72 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. I77.72 mapped to HCC 107 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 107 (Vascular Disease with Complications), ESRD (V21) category 107 (Vascular Disease with Complications), and ESRD (V24) category 107 (Vascular Disease with Complications).