Chapter-Specific Guidelines: Diseases of Body Systems – Key Terms

ICD-10-CM assumes a causal relationship between hypertension and CKD (I12.–) and between hypertension and heart disease (I11.–). End-Stage Renal Disease; coded N18.6 in ICD-10-CM; stage 5 chronic kidney disease requiring dialysis or transplant. ST-Elevation Myocardial Infarction; coded I21.0–I21.3 based on involved coronary artery. Non-ST-Elevation Myocardial Infarction; coded I21.4. Worsening of a chronic respiratory condition beyond normal day-to-day variation; adds specificity to COPD and asthma codes. Default diabetes type when type is not specified; characterized by insulin resistance; uses combination codes for all documented complications. Long-term (current) use of insulin; assigned as additional code for type 2 diabetics on insulin therapy. Classification of tissue damage depth from Stage 1 (intact skin) to Stage 4 (full-thickness, bone/tendon visible). Combination code used when hypertension and heart disease (e.g., heart failure) coexist; assumes causal relationship. ICD-10-CM codes for late effects (residual deficits) following cerebrovascular disease, including hemiplegia, aphasia, and dysphagia.