I82.521 (Chronic embolism and thrombosis of right iliac vein) compared with I82.522 (Chronic embolism and thrombosis of left iliac vein), from the official CMS tabular data. I82.521 and I82.522 code the same condition on opposite sides. MedCoder-derived
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. I82.521 and I82.522 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| I82.521Chronic embolism and thrombosis of right iliac vein | I82.522Chronic embolism and thrombosis of left iliac vein | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | I00-I99 — Diseases of the Circulatory System (I00-I99) | I00-I99 — Diseases of the Circulatory System (I00-I99) |
| Definition | Chronic embolism and thrombosis of right iliac vein is a billable ICD-10-CM diagnosis code (I82.521). | Chronic embolism and thrombosis of left iliac vein is a billable ICD-10-CM diagnosis code (I82.522). |
| Use additional code | code, if applicable, for associated long-term (current) use of anticoagulants (Z79.01) | 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) | 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