Version 2024

2024 ICD-10-CM Diagnosis Code I71.21

Aneurysm of the ascending aorta, without rupture

ICD-10-CM Code:: I71.21
ICD-10 Code for:: Aneurysm of the ascending aorta, without rupture
Is Billable?: Yes - Valid for Submission
Chronic Condition Indicator: ^[1]: Chronic
Code Navigator:

Code Information
Approximate Synonyms
Clinical Classification
Tabular List of Diseases and Injuries
Index to Diseases and Injuries References
Diagnostic Related Groups Mapping
Replacement Code
Patient Education
Other Codes Used Similar Conditions
Code History

Code Classification

Diseases of the circulatory system
(I00–I99)
- Diseases of arteries, arterioles and capillaries
  (I70-I79)
  - Aortic aneurysm and dissection
    (I71)

I71.21 is a billable diagnosis code used to specify a medical diagnosis of aneurysm of the ascending aorta, without rupture. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Aneurysm of aortic root
Aneurysm of aortic sinus of Valsalva with protrusion into left ventricle
Aneurysm of aortic sinus of Valsalva with protrusion into pericardial cavity
Aneurysm of aortic sinus of Valsalva with protrusion into pulmonary artery
Aneurysm of aortic sinus of Valsalva with protrusion into right atrium
Aneurysm of aortic sinus of Valsalva with protrusion into right ventricle
Aneurysm of aortic sinus of Valsalva without rupture
Aneurysm of ascending aorta
Aortic sinus of Valsalva aneurysm from left coronary sinus
Aortic sinus of Valsalva aneurysm from right coronary sinus

Clinical Classification

Clinical Category is Aortic; peripheral; and visceral artery aneurysms
CCSR Category Code: CIR029
Inpatient Default CCSR: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.
Outpatient Default CCSR: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

- Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) - I72.9
- - aorta, aortic (nonsyphilitic) - I71.9
  - - ascending - I71.21
  - - thorax, thoracic - I71.20
    - - ascending - I71.21

I71.21 is grouped with Diagnostic Related Groups - MS-DRG Mapping

Diagnostic Related Groups (DRGs) are a classification system used to group together diagnosis codes for the purpose of reimbursement and healthcare management. DRGs are used to standardize the way hospitals and other providers are paid for inpatient services. In this system patients are grouped together based on their principal diagnosis in areas referred to as Major Diagnostic Categories (MDC). Once a patient is assigned a particular diagnostic category, providers receive a predetermined payment rate for the services rendered. This reimbursement rate is often fixed and is meant to cover the cost of care for that patient. Reimbursement is also affected by the relative weight of a diagnostic related group based on the severity of a patient's illness and the associated cost of care during hospitalization.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V41.0 applicable from 10/01/2023 through 09/30/2024.

MS-DRG	MS-DRG Title	MCD	Relative Weight
299	PERIPHERAL VASCULAR DISORDERS WITH MCC	05	1.5762
300	PERIPHERAL VASCULAR DISORDERS WITH CC	05	1.067
301	PERIPHERAL VASCULAR DISORDERS WITHOUT CC/MCC	05	0.7098

The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Replacement Code

I7121 replaces the following previously assigned ICD-10-CM code(s):

I71.2 - Thoracic aortic aneurysm, without rupture

Code History

FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
FY 2023 - Code Added, effective from 10/1/2022 through 9/30/2023

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
The condition places limitations on self-care, independent living, and social interactions.