The 2024 Diagnosis Related Groups dataset

DRG 311

Angina pectoris

I20.0  Unstable angina

• I20.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2024 edition of ICD-10-CM I20.0 became effective on October 1, 2023.
• This is the American ICD-10-CM version of I20.0 – other international versions of ICD-10 I20.0 may differ.

Applicable To

• Accelerated angina
• Crescendo angina
• De novo effort angina
• Intermediate coronary syndrome
• Preinfarction syndrome
• Worsening effort angina

The following code(s) above I20.0 contain annotation back-references

 that may be applicable to I20.0:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I20  Angina pectoris

Approximate Synonyms

• Preinfarction syndrome

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.

ICD-10-CM I20.0 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 311 Angina pectoris

Convert I20.0 to ICD-9-CMCode 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
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change

Code annotations containing back-references to I20.0:

• Type 1 Excludes: I25.110, I25.700, I25.710, I25.790, I25.730, I25.720

Diagnosis Index entries containing back-references to I20.0:

• Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
  • unstable I20.0
• Impending
  • coronary syndrome I20.0
  • myocardial infarction I20.0
• Infarct, infarction
  • impending I20.0 (myocardium)
• Syndrome – see also Disease
  • coronary
    • insufficiency or intermediate I20.0
  • impending coronary I20.0
  • intermediate coronary I20.0 (artery)
  • preinfarction I20.0

I20.1  Angina pectoris with documented spasm

• I20.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2024 edition of ICD-10-CM I20.1 became effective on October 1, 2023.
• 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

 that may be applicable to I20.1:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I20  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 v41.0):

• 311 Angina pectoris

Convert I20.1 to ICD-9-CMCode 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
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change

Code annotations containing back-references to I20.1:

• Type 1 Excludes: I25.111, I25.701, I25.791, I25.731, I25.711, I25.721

Diagnosis Index entries containing back-references to I20.1:

• Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
  • with
    • documented spasm I20.1
• Ischemia, ischemicI99.8
  • supply (coronary) I25.9 – see also Angina
    • due to vasospasm I20.1
• Prinzmetal angina I20.1
• Spasm(s) R25.2 – see also condition
  • cardiac I20.1
  • coronary I20.1 (artery)
  • heart I20.1
• Vasospasm (vasoconstriction) I73.9 – see also Angiospasm
  • coronary I20.1

I20.2  Refractory angina pectoris

• I20.2 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2024 edition of ICD-10-CM I20.2 became effective on October 1, 2023.
• This is the American ICD-10-CM version of I20.2 – other international versions of ICD-10 I20.2 may differ.

The following code(s) above I20.2 contain annotation back-references

 that may be applicable to I20.2:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I20  Angina pectoris

ICD-10-CM I20.2 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 311 Angina pectoris

Code History

• 2023 (effective 10/1/2022): New code
• 2024 (effective 10/1/2023): No change

Diagnosis Index entries containing back-references to I20.2:

• Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
  • refractory I20.2

I20.81  Angina pectoris with coronary microvascular dysfunction

• I20.81 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• ICD-10-CM I20.81 is a new 2024 ICD-10-CM code that became effective on October 1, 2023.
• This is the American ICD-10-CM version of I20.81 – other international versions of ICD-10 I20.81 may differ.

Applicable To

• Angina pectoris with coronary microvascular disease

The following code(s) above I20.81 contain annotation back-references

 that may be applicable to I20.81:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I20  Angina pectoris
• I20.8  Other forms of angina pectoris

ICD-10-CM I20.81 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 311 Angina pectoris

Code History

• 2024 (effective 10/1/2023): New code

Diagnosis Index entries containing back-references to I20.81:

• Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
  • with
    • coronary microvascular disease I20.81
    • coronary microvascular dysfunction I20.81
• Disease, diseased – see also Syndrome
  • coronary (artery) – see Disease, heart, ischemic, atherosclerotic
    • microvascular
      • with
        • angina pectoris I20.81
• Dysfunction
  • coronary microvascularI25.85
    • with
      • angina pectoris I20.81

I20.89  Other forms of angina pectoris

• I20.89 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• ICD-10-CM I20.89 is a new 2024 ICD-10-CM code that became effective on October 1, 2023.
• This is the American ICD-10-CM version of I20.89 – other international versions of ICD-10 I20.89 may differ.

Applicable To

• Angina equivalent
• Angina of effort
• Coronary slow flow syndrome
• Stable angina
• Stenocardia

The following code(s) above I20.89 contain annotation back-references

 that may be applicable to I20.89:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I20  Angina pectoris
• I20.8  Other forms of angina pectoris

ICD-10-CM I20.89 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 311 Angina pectoris

Code History

• 2024 (effective 10/1/2023): New code

Diagnosis Index entries containing back-references to I20.89:

• Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
  • equivalent I20.89
  • specified NEC I20.89
  • stable I20.89
• Likoff’s syndrome I20.89
• Schaufenster krankheit I20.89
• Slow
  • flow syndrome, coronary I20.89
• Stenocardia I20.89
• Syncope (near) (pre-) R55
  • anginosa I20.89
• Syndrome – see also Disease
  • coronary
    • slow flow I20.89
  • Heberden’s I20.89
  • Likoff’s I20.89
  • slow flow, coronary I20.89

I20.9  Angina pectoris, unspecified

• I20.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2024 edition of ICD-10-CM I20.9 became effective on October 1, 2023.
• 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

 that may be applicable to I20.9:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I20  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 v41.0):

• 311 Angina pectoris

Convert I20.9 to ICD-9-CMCode 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
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change

Code annotations containing back-references to I20.9:

• Type 1 Excludes: I25.119, I25.709, I25.729, I25.739, I25.799, I25.719

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
  • chest (central) R07.9
    • ischemic I20.9
• Status (post) – see also Presence (of)
  • anginosus I20.9
• Syndrome – see also Disease
  • X I20.9

I24.0  Acute coronary thrombosis not resulting in myocardial infarction

• I24.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Acute coronary thrombosis not resulting in myocardial infrc
• The 2024 edition of ICD-10-CM I24.0 became effective on October 1, 2023.
• This is the American ICD-10-CM version of I24.0 – other international versions of ICD-10 I24.0 may differ.

Applicable To

• Acute coronary (artery) (vein) embolism not resulting in myocardial infarction
• Acute coronary (artery) (vein) occlusion not resulting in myocardial infarction
• Acute coronary (artery) (vein) thromboembolism not resulting in myocardial infarction

Type 1 Excludes

• atherosclerotic heart disease (I25.1-)

The following code(s) above I24.0 contain annotation back-references

 that may be applicable to I24.0:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I24  Other acute ischemic heart diseases

Approximate Synonyms

• Acute coronary artery occlusion not resulting in myocardial infarction
• Acute coronary occlusion wihout myocardial infarction
• Acute coronary occlusion without mi

ICD-10-CM I24.0 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 311 Angina pectoris

Convert I24.0 to ICD-9-CMCode 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
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change

Code annotations containing back-references to I24.0:

• Type 1 Excludes: I25.82

Diagnosis Index entries containing back-references to I24.0:

• Embolism (multiple) (paradoxical) I74.9
  • arteryI74.9
    • coronary – see also Infarct, myocardium
      • not resulting in infarction I24.0
• Occlusion, occluded
  • arteryI70.9 – see also Atherosclerosis, artery
    • coronary (acute) (thrombotic) (without myocardial infarction) I24.0
  • coronary (artery) (vein) (thrombotic) – see also Infarct, myocardium
    • not resulting in infarction I24.0
• Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) I82.90
  • artery, arteries (postinfectional) I74.9
    • coronary – see also Infarct, myocardium
      • not resulting in infarction I24.0
  • coronary (artery) (vein) – see also Infarct, myocardium
    • not resulting in infarction I24.0
  • parietal – see also Infarct, myocardium
    • not resulting in infarction I24.0
  • ventricle – see also Infarct, myocardium
    • not resulting in infarction I24.0

I24.81  Acute coronary microvascular dysfunction

• I24.81 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• ICD-10-CM I24.81 is a new 2024 ICD-10-CM code that became effective on October 1, 2023.
• This is the American ICD-10-CM version of I24.81 – other international versions of ICD-10 I24.81 may differ.

Applicable To

• Acute (presentation of) coronary microvascular disease

The following code(s) above I24.81 contain annotation back-references

 that may be applicable to I24.81:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I24  Other acute ischemic heart diseases
• I24.8  Other forms of acute ischemic heart disease

ICD-10-CM I24.81 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 311 Angina pectoris

Code History

• 2024 (effective 10/1/2023): New code

Diagnosis Index entries containing back-references to I24.81:

• Disease, diseased – see also Syndrome
  • coronary (artery) – see Disease, heart, ischemic, atherosclerotic
    • microvascular
      • acute I24.81
• Dysfunction
  • coronary microvascularI25.85
    • acute I24.81

I24.89  Other forms of acute ischemic heart disease

• I24.89 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• ICD-10-CM I24.89 is a new 2024 ICD-10-CM code that became effective on October 1, 2023.
• This is the American ICD-10-CM version of I24.89 – other international versions of ICD-10 I24.89 may differ.

The following code(s) above I24.89 contain annotation back-references

 that may be applicable to I24.89:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I24  Other acute ischemic heart diseases
• I24.8  Other forms of acute ischemic heart disease

ICD-10-CM I24.89 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 311 Angina pectoris

Code History

• 2024 (effective 10/1/2023): New code

Diagnosis Index entries containing back-references to I24.89:

• Disease, diseased – see also Syndrome
  • heart (organic) I51.9
    • ischemic (chronic or with a stated duration of over 4 weeks) I25.9
      • specified form NEC
        • acute I24.89
• Insufficiency, insufficient
  • arterialI77.1
    • coronary I24.89 (acute or subacute)
  • coronary (acute or subacute) I24.89
• Ischemia, ischemicI99.8
  • demand (coronary) I24.89 – see also Angina

I24.9  Acute ischemic heart disease, unspecified

• I24.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2024 edition of ICD-10-CM I24.9 became effective on October 1, 2023.
• This is the American ICD-10-CM version of I24.9 – other international versions of ICD-10 I24.9 may differ.

Type 1 Excludes

• ischemic heart disease (chronic) NOS (I25.9)

The following code(s) above I24.9 contain annotation back-references

 that may be applicable to I24.9:

• I00-I99  Diseases of the circulatory system
• I20-I25  Ischemic heart diseases
• I24  Other acute ischemic heart diseases

Approximate Synonyms

• Acute coronary syndrome

ICD-10-CM I24.9 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 311 Angina pectoris

Convert I24.9 to ICD-9-CMCode 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
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change

Diagnosis Index entries containing back-references to I24.9:

• Cyanotic heart disease I24.9
• Ischemia, ischemicI99.8
  • heart (chronic or with a stated duration of over 4 weeks) I25.9
    • acute or with a stated duration of 4 weeks or less I24.9
    • subacute I24.9
• Syndrome – see also Disease
  • coronary
    • acute NEC I24.9