I87.021 (Postthrombotic syndrome with inflammation of right lower extremity) compared with I87.029 (Postthrombotic syndrome with inflammation of unspecified lower extremity), from the official CMS tabular data. I87.021 and I87.029 code the same condition on opposite sides.
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. I87.021 and I87.029 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.
| I87.021Postthrombotic syndrome with inflammation of right lower extremity | I87.029Postthrombotic syndrome with inflammation of unspecified lower extremity | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | I00-I99 — Diseases of the Circulatory System (I00-I99) | I00-I99 — Diseases of the Circulatory System (I00-I99) |
| Definition | Postthrombotic syndrome with inflammation of right lower extremity is a billable ICD-10-CM diagnosis code (I87.021). | Postthrombotic syndrome with inflammation of unspecified lower extremity is a billable ICD-10-CM diagnosis code (I87.029). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources