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ICD-10-CM 2027 diagnosis code

I35.0Nonrheumatic aortic (valve) stenosis

✓ Billable / specific

I35.0 is a valid, billable ICD-10-CM code for nonrheumatic aortic (valve) stenosis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Aortic valve stenosis.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I35.0

I35.0 is the ICD-10-CM diagnosis code for nonrheumatic aortic (valve) stenosis. It belongs to category I35 (nonrheumatic aortic valve disorders), block I30-I5A (other forms of heart disease) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within I35 (nonrheumatic aortic valve disorders), I35.0 is specifically for nonrheumatic aortic (valve) stenosis. Related codes cover nonrheumatic aortic (valve) insufficiency (I35.1), nonrheumatic aortic (valve) stenosis with insufficiency (I35.2), other nonrheumatic aortic valve disorders (I35.8) and nonrheumatic aortic valve disorder, unspecified (I35.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 306 (Cardiac Congenital and Valvular Disorders with MCC, relative weight 1.546) and DRG 307 (Cardiac Congenital and Valvular Disorders without MCC, relative weight 0.9148), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 424.1 (aortic valve disorders).

Notes that apply from higher levels

Instructions written at a parent level also apply to I35.0.

› From I35 Nonrheumatic aortic valve disorders
Excludes2
  • aortic valve disorder of unspecified cause but with diseases of mitral and/or tricuspid valve(s) (I08.-)
  • aortic valve disorder specified as congenital (Q23.0, Q23.1)
  • aortic valve disorder specified as rheumatic (I06.-)
  • hypertrophic subaortic stenosis (I42.1)
Code also
  • , if applicable, bicuspid aortic valve (Q23.81)

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to I35.0.

Codes whose notes reference I35.0

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 424.1Aortic valve disordersapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about I35.0

Is I35.0 billable?

Yes. I35.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I35.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I35.0 as a principal diagnosis.

Is I35.0 a CC or MCC?

No. I35.0 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does I35.0 group to?

I35.0 is used in the MS-DRG v44.0 logic for MS-DRG 306 (Cardiac Congenital and Valvular Disorders with MCC) and MS-DRG 307 (Cardiac Congenital and Valvular Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for I35.0?

The CMS General Equivalence Mappings map I35.0 to ICD-9-CM 424.1.