2019 ICD-10-CM Diagnosis Code I20.1

Angina pectoris with documented spasm

    2016 2017 2018 2019 Billable/Specific Code
  • I20.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM I20.1 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of I20.1 - other international versions of ICD-10 I20.1 may differ.
Applicable To
  • Angiospastic angina
  • Prinzmetal angina
  • Spasm-induced angina
  • Variant angina
The following code(s) above I20.1 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to I20.1:
  • I00-I99
    2019 ICD-10-CM Range I00-I99

    Diseases of the circulatory system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    • systemic connective tissue disorders (M30-M36)
    • transient cerebral ischemic attacks and related syndromes (G45.-)
    Diseases of the circulatory system
  • I20-I25
    2019 ICD-10-CM Range I20-I25

    Ischemic heart diseases

    Use Additional
    • code to identify presence of hypertension (I10-I16)
    Ischemic heart diseases
  • I20
    ICD-10-CM Diagnosis Code I20

    Angina pectoris

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • angina pectoris with atherosclerotic heart disease of native coronary arteries (I25.1-)
    • atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris (I25.7-)
    • postinfarction angina (I23.7)
    Use Additional
    • code to identify:
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
    Angina pectoris
Approximate Synonyms
  • Prinzmetal angina
Clinical Information
  • (syn. Prinzmetal's angina or coronary artery vasospasm). It usually occurs spontaneously, and unlike typical angina, it nearly always occurs when a person is at rest and does not require physical exertion. It frequently is associated with transient st-segment elevation. (nih roadmap cardiovascular data standards working group)
  • A clinical syndrome characterized by the development of chest pain at rest with concomitant transient st segment elevation in the electrocardiogram, but with preserved exercise capacity.
  • A variant form of angina pectoris caused by coronary artery vasospasm, usually occurring spontaneously and frequently associated with st segment elevation.
ICD-10-CM I20.1 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 311 Angina pectoris

Convert I20.1 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
Code annotations containing back-references to I20.1:
  • Type 1 Excludes: I25.111
    , I25.711
    , I25.721
    , I25.731
    , I25.791
    , I25.701
    ICD-10-CM Diagnosis Code I25.111

    Atherosclerotic heart disease of native coronary artery with angina pectoris with documented spasm

      2016 2017 2018 2019 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • angina pectoris with documented spasm without atherosclerotic heart disease (I20.1)
    ICD-10-CM Diagnosis Code I25.711

    Atherosclerosis of autologous vein coronary artery bypass graft(s) with angina pectoris with documented spasm

      2016 2017 2018 2019 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • angina pectoris with documented spasm without atherosclerosis of autologous vein coronary artery bypass graft(s) (I20.1)
    ICD-10-CM Diagnosis Code I25.721

    Atherosclerosis of autologous artery coronary artery bypass graft(s) with angina pectoris with documented spasm

      2016 2017 2018 2019 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • angina pectoris with documented spasm without atherosclerosis of autologous artery coronary artery bypass graft(s) (I20.1)
    ICD-10-CM Diagnosis Code I25.731

    Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with angina pectoris with documented spasm

      2016 2017 2018 2019 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • angina pectoris with documented spasm without atherosclerosis of nonautologous biological coronary artery bypass graft(s) (I20.1)
    ICD-10-CM Diagnosis Code I25.791

    Atherosclerosis of other coronary artery bypass graft(s) with angina pectoris with documented spasm

      2016 2017 2018 2019 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • angina pectoris with documented spasm without atherosclerosis of other coronary artery bypass graft(s) (I20.1)
    ICD-10-CM Diagnosis Code I25.701

    Atherosclerosis of coronary artery bypass graft(s), unspecified, with angina pectoris with documented spasm

      2016 2017 2018 2019 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • angina pectoris with documented spasm without atherosclerosis of coronary artery bypass graft (I20.1)

Diagnosis Index entries containing back-references to I20.1:
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
    ICD-10-CM Diagnosis Code I20.9

    Angina pectoris, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Angina NOS
    • Anginal syndrome
    • Cardiac angina
    • Ischemic chest pain
    • with
      • documented spasm I20.1
  • Ischemia, ischemic I99.8
    ICD-10-CM Diagnosis Code I99.8

    Other disorder of circulatory system

      2016 2017 2018 2019 Billable/Specific Code
    • supply (coronary) I25.9
      - see also Angina
      ICD-10-CM Diagnosis Code I25.9

      Chronic ischemic heart disease, unspecified

        2016 2017 2018 2019 Billable/Specific Code
      Applicable To
      • Ischemic heart disease (chronic) NOS
      • due to vasospasm I20.1
  • Prinzmetal angina I20.1
  • Spasm(s) R25.2
    - see also condition
    ICD-10-CM Diagnosis Code R25.2

    Cramp and spasm

      2016 2017 2018 2019 Billable/Specific Code
    Type 2 Excludes
    • cardiac I20.1
    • coronary I20.1 (artery)
    • heart I20.1
  • Vasospasm (vasoconstriction) I73.9
    ICD-10-CM Diagnosis Code I73.9

    Peripheral vascular disease, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Intermittent claudication
    • Peripheral angiopathy NOS
    • Spasm of artery
    Type 1 Excludes
    • coronary I20.1

ICD-10-CM Codes Adjacent To I20.1
I15.1 Hypertension secondary to other renal disorders
I15.2 Hypertension secondary to endocrine disorders
I15.8 Other secondary hypertension
I15.9 Secondary hypertension, unspecified
I16 Hypertensive crisis
I16.0 Hypertensive urgency
I16.1 Hypertensive emergency
I16.9 Hypertensive crisis, unspecified
I20 Angina pectoris
I20.0 Unstable angina
I20.1 Angina pectoris with documented spasm
I20.8 Other forms of angina pectoris
I20.9 Angina pectoris, unspecified
I21 Acute myocardial infarction
I21.0 ST elevation (STEMI) myocardial infarction of anterior wall
I21.01 ST elevation (STEMI) myocardial infarction involving left main coronary artery
I21.02 ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
I21.09 ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
I21.1 ST elevation (STEMI) myocardial infarction of inferior wall
I21.11 ST elevation (STEMI) myocardial infarction involving right coronary artery
I21.19 ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.