Specific code 2014 ICD-9-CM Diagnosis Code 411.1
Intermediate coronary syndrome
  • Billable Code
  • Short description: Intermed coronary synd.
  • ICD-9-CM 411.1 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 411.1 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Acute coronary syndrome
  • Angina, unstable
  • Preinfarction syndrome
  • Unstable angina
Clinical Information
  • Angina pectoris (or equivalent type of ischemic discomfort) which has recently changed in frequency, duration, intensity, or occurs at rest.
  • Angina pectoris (or equivalent type of ischemic discomfort) with any 1 of the 3 following features: a) angina occurring at rest and prolonged, usually greater than 20 minutes; b) new onset angina of at least canadian cardiovascular society grading scale (or ccs classification system) classification severity iii or greater; c) recent acceleration in angina accentuated by an increase in severity of at least 1 ccs class to at least ccs class iii. The biomarkers of necrosis are below the threshold of myocardial infarction.
  • Angina pectoris (or equivalent type of ischemic discomfort) with any 1 of the 3 following features: a) angina occurring at rest and prolonged, usually greater than 20 minutes; b) new onset angina of at least canadian cardiovascular society grading scale (or ccs classification system) classification severity iii or greater; c) recent acceleration in angina accentuated by an increase in severity of at least 1 ccs class to at least ccs class iii. The biomarkers of necrosis are below the threshold of myocardial infarction. (nih roadmap cardiovascular data standards working group)
  • Precordial pain at rest, which may precede a myocardial infarction.
411.1 Excludes
Applies To
  • Impending infarction
  • Preinfarction angina
  • Preinfarction syndrome
  • Unstable angina
Convert to ICD-10-CM: 411.1 converts approximately to:
  • 2014 ICD-10-CM I20.0 Unstable angina
ICD-9-CM Volume 2 Index entries containing back-references to 411.1:
  • Angina (attack) (cardiac) (chest) (effort) (heart) (pectoris) (syndrome) (vasomotor) 413.9
    • accelerated 411.1
    • crescendo 411.1
    • initial 411.1
    • preinfarctional 411.1
    • progressive 411.1
    • unstable 411.1
  • Impending
    • coronary syndrome 411.1
    • myocardial infarction 411.1
  • Infarct, infarction
    • impending (myocardium) 411.1
    • myocardium, myocardial (acute or with a stated duration of 8 weeks or less) (with hypertension) 410.9
      • with symptoms after 8 weeks from date of infarction 414.8
      • anterior (wall) (with contiguous portion of intraventricular septum) NEC 410.1
      • anteroapical (with contiguous portion of intraventricular septum) 410.1
      • anterolateral (wall) 410.0
      • anteroseptal (with contiguous portion of intraventricular septum) 410.1
      • apical-lateral 410.5
      • atrial 410.8
      • basal-lateral 410.5
      • chronic (with symptoms after 8 weeks from date of infarction) 414.8
      • diagnosed on ECG, but presenting no symptoms 412
      • diaphragmatic wall (with contiguous portion of intraventricular septum) 410.4
      • healed or old, currently presenting no symptoms 412
      • high lateral 410.5
      • impending 411.1
      • inferior (wall) (with contiguous portion of intraventricular septum) 410.4
      • inferolateral (wall) 410.2
      • inferoposterior wall 410.3
      • intraoperative 997.1
      • lateral wall 410.5
      • non-Q wave 410.7
      • non-ST elevation (NSTEMI) 410.7
      • nontransmural 410.7
      • papillary muscle 410.8
      • past (diagnosed on ECG or other special investigation, but currently presenting no symptoms) 412
      • posterior (strictly) (true) (wall) 410.6
      • posterobasal 410.6
      • posteroinferior 410.3
      • posterolateral 410.5
      • postprocedural 997.1
      • previous, currently presenting no symptoms 412
      • Q wave (see also Infarct, myocardium, by site) 410.9
      • septal 410.8
      • specified site NEC 410.8
      • ST elevation (STEMI) 410.9
        • anterior (wall) 410.1
        • anterolateral (wall) 410.0
        • inferior (wall) 410.4
        • inferolateral (wall) 410.2
        • inferoposterior wall 410.3
        • lateral wall 410.5
        • posterior (strictly) (true) (wall) 410.6
        • specified site NEC 410.8
      • subendocardial 410.7
      • syphilitic 093.82
  • Syndrome - see also Disease
    • acute coronary 411.1
    • coronary insufficiency or intermediate 411.1
    • impending coronary 411.1
    • intermediate coronary (artery) 411.1
    • preinfarction 411.1
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 411.1 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 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.