I25.11

Atherosclerotic heart disease of native coronary artery with angina pectoris

Atherosclerotic heart disease of native coronary artery with angina pectoris (I25.11) represents a chronic ischemic condition where the heart's original (native) arteries have become narrowed or obstructed by atherosclerotic plaques. This specific subcategory acts as a header for cases where this structural disease is complicated by various forms of angina pectoris, most notably unstable angina (I25.110). Pathophysiologically, the buildup of cholesterol, fatty substances, and cellular waste in the vessel walls causes a critical mismatch between myocardial oxygen demand and supply. When this plaque becomes unstable, erodes, or ruptures—often leading to non-occlusive thrombus formation—the patient may experience unstable angina, a component of Acute Coronary Syndrome (ACS). This clinical state is high-risk, as it signifies an imminent threat of complete vessel occlusion and subsequent myocardial infarction. Management typically involves aggressive medical therapy, including antiplatelet agents and statins, and often necessitates invasive evaluation via coronary angiography for potential revascularization.

Clinical Symptoms

  • Chest pain or discomfort at rest (unstable angina)
  • Crescendo angina (increasing frequency, duration, or intensity)
  • Pain radiating to the left arm, neck, jaw, or shoulder blades
  • Diaphoresis (cold sweats)
  • Dyspnea (shortness of breath)
  • Nausea or vomiting during pain episodes
  • Sudden unexplained fatigue or weakness
  • Lightheadedness or near-syncope
  • Sense of impending doom

Common Causes

  • Atherosclerotic plaque buildup (primary etiology)
  • Plaque rupture or erosion with subsequent thrombus formation
  • Hyperlipidemia and elevated LDL cholesterol
  • Chronic hypertension causing endothelial stress
  • Diabetes mellitus (accelerates macrovascular disease)
  • Long-term tobacco use or exposure
  • Family history of premature coronary artery disease
  • Obesity and sedentary lifestyle
  • Age-related vascular degeneration

Documentation & Coding Tips

Distinguish between native coronary arteries and bypass grafts to ensure correct 5th character selection.

Example: 72-year-old female with no history of coronary artery bypass grafting presents with retrosternal chest pressure. Coronary angiography confirms 85 percent stenosis in the native left anterior descending artery. Diagnosis: Atherosclerotic heart disease of native coronary artery with stable angina pectoris (I25.118).

Billing Focus: Documentation must specify the artery as native to support the I25.1- series versus the I25.7- series for bypass grafts.

Explicitly link the angina to the underlying coronary artery disease to utilize the I25.11- combination codes.

Example: Patient with established native CAD presents with increasing frequency of chest pain. Assessment: Angina pectoris due to native coronary atherosclerosis. Documentation supports the use of I25.110 for unstable angina in the setting of native CAD.

Billing Focus: Use of combination codes (CAD with angina) is required by ICD-10-CM guidelines when the causal relationship is documented.

Specify the stability and documentation of spasm within the clinical note for 6th character specificity.

Example: 64-year-old male with native CAD presents with chest pain occurring at rest. EKG shows transient ST elevation. Cardiac cath confirms coronary vasospasm at the site of atherosclerosis. Documentation: Native coronary artery disease with angina pectoris with documented spasm (I25.111).

Billing Focus: A 6th character of 1 is required when spasm is documented as the cause of the angina in the setting of CAD.

Avoid using unspecified angina codes when clinical indicators for stability or instability are present.

Example: Patient with native CAD presents with chest pain that has remained consistent with exertion for the last 6 months, relieved by rest. Documentation: Native coronary atherosclerosis with other forms of angina pectoris, specifically chronic stable angina (I25.118).

Billing Focus: The code I25.118 is used for stable or other specified angina, preventing the use of the unspecified I25.119 code.

Document the coronary artery involved if known, even if the primary code is based on the native vessel status.

Example: Evaluation of 60-year-old male shows native coronary artery disease of the right coronary artery (RCA) with associated unstable angina. Diagnosis: Atherosclerotic heart disease of native coronary artery with unstable angina (I25.110).

Billing Focus: Supports medical necessity for procedural interventions such as CPT 93454 (coronary angiography) by specifying the native vessel pathology.

Relevant CPT Codes

Related Diagnoses

Hierarchy