2021 ICD-10-CM Diagnosis Code I20.9

Angina pectoris, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • I20.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM I20.9 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of I20.9 - other international versions of ICD-10 I20.9 may differ.
Applicable To
  • Angina NOS
  • Anginal syndrome
  • Cardiac angina
  • Ischemic chest pain
The following code(s) above I20.9 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 I20.9:
  • I00-I99
    2021 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
    2021 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 2020 2021 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
  • Angina
  • Angina pectoris
  • Angina pectoris (chest pain)
  • Cardiac syndrome x
  • History of myocardial infarction with stable angina
  • Stable angina
  • Stable angina with history of attack
Clinical Information
  • A disorder characterized by substernal discomfort due to insufficient myocardial oxygenation.
  • A heart condition marked by paroxysms of chest pain due to reduced oxygen to the heart.
  • Angina is chest pain or discomfort you get when your heart muscle does not get enough blood. It 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, unstable and variant. 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.not all chest pain or discomfort is angina. If you have chest pain, you should see your health care provider.
  • Chest pain caused by coronary heart disease
  • Previous or current symptoms described as chest pain or pressure, jaw pain, arm pain, or other equivalent discomfort suggestive of cardiac ischemia.
  • Previous or current symptoms described as chest pain or pressure, jaw pain, arm pain, or other equivalent discomfort suggestive of cardiac ischemia. (nih roadmap cardiovascular data standards working group)
  • Recurring thoracic pain or discomfort which occurs when a part of the heart does not receive enough blood; usually caused by exertion or excitement.
  • The symptom of paroxysmal pain consequent to myocardial ischemia usually of distinctive character, location and radiation. It is thought to be provoked by a transient stressful situation during which the oxygen requirements of the myocardium exceed that supplied by the coronary circulation.
ICD-10-CM I20.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 311 Angina pectoris

Convert I20.9 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
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
Code annotations containing back-references to I20.9:
  • Type 1 Excludes: I25.119
    , I25.719
    , I25.729
    , I25.799
    , I25.739
    , I25.709
    ICD-10-CM Diagnosis Code I25.119

    Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Adult Dx (15-124 years)
    Applicable To
    • Atherosclerotic heart disease with angina NOS
    • Atherosclerotic heart disease with ischemic chest pain
    Type 1 Excludes
    • unspecified angina pectoris without atherosclerotic heart disease (I20.9)
    ICD-10-CM Diagnosis Code I25.719

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

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • unspecified angina pectoris without atherosclerosis of autologous vein coronary artery bypass graft(s) (I20.9)
    ICD-10-CM Diagnosis Code I25.729

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

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • unspecified angina pectoris without atherosclerosis of autologous artery coronary artery bypass graft(s) (I20.9)
    ICD-10-CM Diagnosis Code I25.799

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

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • unspecified angina pectoris without atherosclerosis of other coronary artery bypass graft(s) (I20.9)
    ICD-10-CM Diagnosis Code I25.739

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

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • unspecified angina pectoris without atherosclerosis of nonautologous biological coronary artery bypass graft(s) (I20.9)
    ICD-10-CM Diagnosis Code I25.709

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

      2016 2017 2018 2019 2020 2021 Billable/Specific Code Adult Dx (15-124 years)
    Type 1 Excludes
    • unspecified angina pectoris without atherosclerosis of coronary artery bypass graft (I20.9)

Diagnosis Index entries containing back-references to I20.9:
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
  • Pain(s) R52
    - see also Painful
    ICD-10-CM Diagnosis Code R52

    Pain, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Acute pain NOS
    • Generalized pain NOS
    • Pain NOS
    Type 1 Excludes
    • acute and chronic pain, not elsewhere classified (G89.-)
    • localized pain, unspecified type - code to pain by site, such as:
    • abdomen pain (R10.-)
    • back pain (M54.9)
    • breast pain (N64.4)
    • chest pain (R07.1-R07.9)
    • ear pain (H92.0-)
    • eye pain (H57.1)
    • headache (R51.9)
    • joint pain (M25.5-)
    • limb pain (M79.6-)
    • lumbar region pain (M54.5)
    • pelvic and perineal pain (R10.2)
    • shoulder pain (M25.51-)
    • spine pain (M54.-)
    • throat pain (R07.0)
    • tongue pain (K14.6)
    • tooth pain (K08.8)
    • renal colic (N23)
    • pain disorders exclusively related to psychological factors (F45.41)
    • chest (central) R07.9
      ICD-10-CM Diagnosis Code R07.9

      Chest pain, unspecified

        2016 2017 2018 2019 2020 2021 Billable/Specific Code
      • ischemic I20.9
  • Status (post) - see also Presence (of)
    • anginosus I20.9
  • Syndrome - see also Disease
    • X I20.9

ICD-10-CM Codes Adjacent To I20.9
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
I21.2 ST elevation (STEMI) myocardial infarction of other sites
I21.21 ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery

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