ICD-10-CM › I00-I99 › I20-I25 › I20 Angina pectoris › I20.0
Unstable angina
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Unstable angina
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from I20 Angina pectoris
Excludes1 - never coded here
- 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
- 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)
Inherited from the I20-I25 section Ischemic heart diseases (I20-I25)
Code also
- the presence of hypertension (I10-I1A)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Sternalgia
- Pseudoangina
- Pain > coronary
- Angina > variant
- Angina > crescendo
- Syndrome > anginal
- Angina > Prinzmetal
- Angina > accelerated
- Angina > progressive
- Angina > angiospastic
- Angina > spasm-induced
- Angina > de novo effort
- Attack, attacks > angina
- Angina > pre-infarctional
- Angina > worsening effort
- Ischemia, ischemic > demand
- Ischemia, ischemic > supply
- Angina > unstable
- Syndrome > preinfarction
- Impending > coronary syndrome
- Syndrome > impending coronary
- Infarct, infarction > impending
- Syndrome > intermediate coronary
- Impending > myocardial infarction
- Syndrome > coronary > insufficiency or intermediate
Codes in the same group
| Code | Description | Status |
|---|---|---|
| I20.1 | Angina pectoris with documented spasm | Valid |
| I20.2 | Refractory angina pectoris | Valid |
| I20.8 | Other forms of angina pectoris | Not billable |
| I20.9 | Angina pectoris, unspecified | Valid |