ICD-9 Diagnosis Code 413.1

Prinzmetal angina

Diagnosis Code 413.1

ICD-9: 413.1
Short Description: Prinzmetal angina
Long Description: Prinzmetal angina
This is the 2014 version of the ICD-9-CM diagnosis code 413.1

Code Classification
  • Diseases of the circulatory system (390–459)
    • Ischemic heart disease (410-414)
      • 413 Angina pectoris

Information for Medical Professionals

Convert to ICD-10 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • I20.1 - Angina pectoris with documented spasm

Index of Diseases and Injuries
References found for the code 413.1 in the Index of Diseases and Injuries:

    • Angina (attack) (cardiac) (chest) (effort) (heart) (pectoris) (syndrome) (vasomotor) 413.9
      • Prinzmetal's 413.1
      • variant 413.1
    • Prinzmetal's angina 413.1
    • Vasospasm 443.9
      • coronary 413.1

Information for Patients


Angina is chest pain or discomfort you feel when there is not enough blood flow to your heart muscle. Your heart muscle needs the oxygen that the blood carries. Angina may feel like pressure or a squeezing pain in your chest. It may feel like indigestion. You may also feel pain in your shoulders, arms, neck, jaw, or back.

Angina is a symptom of coronary artery disease (CAD), the most common heart disease. CAD happens when a sticky substance called plaque builds up in the arteries that supply blood to the heart, reducing blood flow.

There are three types of angina:

  • Stable angina is the most common type. It happens when the heart is working harder than usual. Stable angina has a regular pattern. Rest and medicines usually help.
  • Unstable angina is the most dangerous. It does not follow a pattern and can happen without physical exertion. It does not go away with rest or medicine. It is a sign that you could have a heart attack soon.
  • Variant angina is rare. It happens when you are resting. Medicines can help.

Not all chest pain or discomfort is angina. If you have chest pain, you should see your health care provider.

NIH: National Heart, Lung, and Blood Institute

  • Acute coronary syndrome
  • Angina - discharge
  • Angina - when you have chest pain
  • Coronary angiography
  • Electrocardiogram
  • Living with heart disease and angina
  • Stable angina
  • Unstable angina

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