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I82.5Y1 vs I82.5Y9

I82.5Y1 (Chronic embolism and thrombosis of unspecified deep veins of right proximal lower extremity) compared with I82.5Y9 (Chronic embolism and thrombosis of unspecified deep veins of unspecified proximal lower extremity), from the official CMS tabular data. I82.5Y1 and I82.5Y9 code the same condition on opposite sides. MedCoder-derived

Relationship

Review

Laterality relationship

I82.5Y1
Right
Chronic embolism and thrombosis of unspecified deep veins of right proximal lower extremity
↔
I82.5Y9
Unspecified
Chronic embolism and thrombosis of unspecified deep veins of unspecified proximal lower extremity

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)

Can these codes be reported together?

Same condition, opposite side. I82.5Y1 and I82.5Y9 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.

Side by side

I82.5Y1Chronic embolism and thrombosis of unspecified deep veins of right proximal lower extremityI82.5Y9Chronic embolism and thrombosis of unspecified deep veins of unspecified proximal lower extremity
Billing statusBillableBillable
ClassificationI00-I99 — Diseases of the circulatory systemI00-I99 — Diseases of the circulatory system
DefinitionChronic embolism and thrombosis of unspecified deep veins of right proximal lower extremity is a billable ICD-10-CM diagnosis code (I82.5Y1).Chronic embolism and thrombosis of unspecified deep veins of unspecified proximal lower extremity is a billable ICD-10-CM diagnosis code (I82.5Y9).
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)
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources