I21 vs I82.56
I21 (Acute myocardial infarction) compared with I82.56 (Chronic embolism and thrombosis of calf muscular vein), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. I82.56 carries an Excludes2 note covering I21: “coronary (I21-I25)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| I21Acute myocardial infarction | I82.56Chronic embolism and thrombosis of calf muscular vein | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | I00-I99 — Diseases of the Circulatory System (I00-I99) | I00-I99 — Diseases of the Circulatory System (I00-I99) |
| Definition | Acute myocardial infarction is a non-billable ICD-10-CM category code (I21). | Chronic embolism and thrombosis of calf muscular vein is a non-billable ICD-10-CM category code (I82.56). |
| Includes | cardiac infarction coronary (artery) embolism coronary (artery) occlusion coronary (artery) rupture | Chronic embolism and thrombosis of calf muscular vein NOS Chronic embolism and thrombosis of gastrocnemial vein Chronic embolism and thrombosis of soleal vein |
| Use additional code | code, if applicable, to identify: exposure to environmental tobacco smoke (Z77.22) history of tobacco dependence (Z87.891) | code, if applicable, for associated long-term (current) use of anticoagulants (Z79.01) |
| Code first | — | venous embolism and thrombosis complicating: abortion, ectopic or molar pregnancy (O00-O07, O08.7) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources