2011 ICD-9-CM Diagnosis Code 421.9 : Acute endocarditis unspecified

Acute inflammation of the endocardium. Bacteria is the usual etiologic agent, and the distinction between "acute" and "subacute" has traditionally been made based on the pathogenic organism and clinical presentation.
Short description: Ac/subac endocardit NOS.
ICD-9-CM 421.9 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
You are viewing the 2011 version of ICD-9-CM 421.9.
More recent version(s) of ICD-9-CM 421.9: 2012 2013.

421.9 Alternative Terminology

421.9 Excludes

Applies To

Convert 421.9 to ICD-10-CM

ICD-9-CM Volume 2 Index entries containing back-references to 421.9:

Endocarditis (chronic) (indeterminate) (interstitial) (marantic) (nonbacterial thrombotic) (residual) (sclerotic) (sclerous) (senile) (valvular) 424.90
- acute or subacute 421.9
  - rheumatic (aortic) (mitral) (pulmonary) (tricuspid) 391.1
    - with chorea (acute) (rheumatic) (Sydenham's) 392.0
- aortic (heart) (nonrheumatic) (valve) 424.1
  - with
    - mitral (valve) disease 396.9
      - active or acute 391.1
        with chorea (acute) (rheumatic) (Sydenham's) 392.0
        bacterial 421.0
    - rheumatic fever (conditions classifiable to 390)
      - active - see Endocarditis, acute, rheumatic
      - inactive or quiescent (with chorea) 395.9
        with mitral disease 396.9
  - acute or subacute 421.9
  - arteriosclerotic 424.1
  - congenital 746.89
  - hypertensive 424.1
  - rheumatic (chronic) (inactive) 395.9
    - with mitral (valve) disease 396.9
      - active or acute 391.1
        with chorea (acute) (rheumatic) (Sydenham's) 392.0
    - active or acute 391.1
      - with chorea (acute) (rheumatic) (Sydenham's) 392.0
  - specified cause, except rheumatic 424.1
  - syphilitic 093.22
- mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea) 394.9
  - with
    - aortic (valve) disease 396.9
      - active or acute 391.1
        with chorea (acute) (rheumatic) (Sydenham's) 392.0
    - rheumatic fever (conditions classifiable to 390)
      - active - see Endocarditis, acute, rheumatic
      - inactive or quiescent (with chorea) 394.9
        with aortic valve disease 396.9
  - active or acute 391.1
    - with chorea (acute) (rheumatic) (Sydenham's) 392.0
    - bacterial 421.0
  - arteriosclerotic 424.0
  - congenital 746.89
  - hypertensive 424.0
  - nonrheumatic 424.0
    - acute or subacute 421.9
  - syphilitic 093.21
- pulmonary (chronic) (heart) (valve) 424.3
  - with
    - rheumatic fever (conditions classifiable to 390)
      - active - see Endocarditis, acute, rheumatic
      - inactive or quiescent (with chorea) 397.1
  - acute or subacute 421.9
    - rheumatic 391.1
      - with chorea (acute) (rheumatic) (Sydenham's) 392.0
  - arteriosclerotic or due to arteriosclerosis 424.3
  - congenital 746.09
  - hypertensive or due to hypertension (benign) 424.3
  - rheumatic (chronic) (inactive) (with chorea) 397.1
    - active or acute 391.1
      - with chorea (acute) (rheumatic) (Sydenham's) 392.0
  - syphilitic 093.24
- toxic (see also Endocarditis, acute) 421.9
- tricuspid (chronic) (heart) (inactive) (rheumatic) (valve) (with chorea) 397.0
  - with
    - rheumatic fever (conditions classifiable to 390)
      - active - see Endocarditis, acute, rheumatic
      - inactive or quiescent (with chorea) 397.0
  - active or acute 391.1
    - with chorea (acute) (rheumatic) (Sydenham's) 392.0
  - arteriosclerotic 424.2
  - congenital 746.89
  - hypertensive 424.2
  - nonrheumatic 424.2
    - acute or subacute 421.9
  - specified cause, except rheumatic 424.2
  - syphilitic 093.23
Myoendocarditis - see also Endocarditis
- acute or subacute 421.9
Periendocarditis (see also Endocarditis) 424.90
- acute or subacute 421.9

421.1

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ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 421.9 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2011 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.

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