ICD-10: Prepare For Reporting Aortic Valve Disorders

Fri, Jun 22, 2012 --


There are going to be many changes in the ICD-10 and to be sure your practice is ready to report aortic valve disorders, check out how the new code set divides this diagnosis.

ICD-9-CM Code

  • 424.1, Aortic valve disorders

ICD-10-CM Codes

  • I35.0, Nonrheumatic aortic (valve) stenosis
  • I35.1, Nonrheumatic aortic (valve) insufficiency
  • I35.2, Nonrheumatic aortic (valve) stenosis with insufficiency
  • I35.8, Other nonrheumatic aortic valve disorders
  • I35.9, Nonrheumatic aortic valve disorder, unspecified

A disorder of the aortic valve refers to a problem with the valve between the aorta and the left ventricle.

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ICD-9 rules: There is one code in ICD-9 that covers aortic valve disorders not specified as rheumatic. Among the notes with the code is an excludes note pointing you instead to 395.x (Diseases of aortic valve) when documentation specifies “rheumatic.”

ICD-10 changes: Under the new code set, you’ll need to choose from multiple aortic valve disorder codes in the I35.- range under ICD-10. You’ll have separate codes for stenosis (I35.0), insufficiency (I35.1), stenosis with insufficiency (I35.2), other (I35.8), and unspecified (I35.9).

The notes for I35, Nonrheumatic aortic valve disorders, state:


  • 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).

Documentation: To support proper coding, the physician should take care to document whether the aortic valve disease is rheumatic or not rheumatic. Also alert physicians that you need to know whether the condition is congenital because it affects your code choice. Because you won’t have the one-code-fits-all option for aortic valve disorders under ICD-10, your physician’s documentation needs to specify the type of disorder for you to choose the most specific code.

Tips: Take note that when documentation shows both stenosis and insufficiency, you should choose single code I35.2 rather than reporting both I35.0 and I35.1. Also remember that insufficiency may be documented using incompetence or regurgitation. The “other” in I35.8 means the physician documented the type, but ICD-10 doesn’t offer a code specific to the documented type. The “unspecified” in I35.9 means the physician did not document the type.


Barnali is a medical coding and billing writer at TCI who has worked in the healthcare industry since 2009. She holds a master’s degree in English literature and a diploma in advertising and marketing. She enjoys writing about ICD-10 and Medicare compliance.

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1 Comments For This Post

  1. Sharon Says:

    Question: If a patient has a history of rheumatic heart disease of the mitral valve and aortic valve but had a valvuloplasty 40 years ago then both valves were mechanically replaced 35 years ago, and the stenosis of the aorta valve worsened, would this new stenosis still be considered rheumatic aorta valve stenosis? I06.0?

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