I20.81
BillableAngina pectoris with coronary microvascular dysfunction
HCC Category Mapping
V24HCC 88 — Angina Pectoris
0.000ESRDHCC 88 — Angina Pectoris
0.000RxHCCHCC 188 — Coronary Artery Disease and Angina
0.000What This Code Means
Chest pain caused by dysfunction of very small blood vessels in the heart that limits blood flow, even though larger coronary arteries appear normal.
Coding Tips
- •This diagnosis is typically made after ruling out significant coronary artery disease on angiography
- •Document evidence of microvascular dysfunction such as abnormal coronary flow reserve or endothelial dysfunction testing
Clinical Significance
Angina pectoris with coronary microvascular dysfunction (previously known as cardiac syndrome X or microvascular angina) describes chest pain caused by dysfunction of the small coronary arteries despite normal epicardial coronary arteries on angiography. This is an increasingly recognized diagnosis, particularly in women, that is associated with adverse cardiovascular outcomes and requires targeted therapy.
Documentation Requirements
- ✓Provider documentation of angina attributed to coronary microvascular dysfunction
- ✓Coronary angiography showing normal or non-obstructive epicardial coronary arteries
- ✓Evidence of microvascular dysfunction (abnormal coronary flow reserve, index of microcirculatory resistance, or MRI perfusion defects)
- ✓Symptom description (exertional chest pain, may also occur at rest)
- ✓Exclusion of other causes of chest pain (non-cardiac, vasospasm)
- ✓Treatment plan addressing microvascular dysfunction (ACE inhibitors, statins, ranolazine)
- ✓Functional testing results (stress test may show ischemia despite normal coronaries)
Commonly Confused Codes
I20.0 — Unstable angina (acute destabilization; microvascular angina is typically a chronic condition)I20.1 — Angina with documented spasm (epicardial vasospasm, not microvascular dysfunction)I20.2 — Refractory angina (may overlap but refractory implies failure of all treatment options)I25.110-I25.119 — Atherosclerotic heart disease with angina (obstructive epicardial disease; microvascular is non-obstructive)I20.9 — Angina pectoris, unspecified (less specific; I20.81 should be used when microvascular dysfunction is confirmed)R07.9 — Chest pain, unspecified (symptom code only; use I20.81 when diagnosis is established)
Code Hierarchy
└I20Angina pectoris└I20.8Other forms of angina pectoris└I20.81Angina pectoris with coronary microvascular dysfunction
└I20.81Angina pectoris with coronary microvascular dysfunction