M02.362 Reiter's disease, left knee

ICD-10-CM Diagnosis Code M02.362: Reiter's disease, left knee

ICD-10-CM code M02.362 identifies Reiter's disease affecting the left knee. The terminology is active for the 2026 version of the ICD-10-CM system. This specific diagnosis code is structurally classified under a broader parent concept for Reiter's disease of the knee, distinguishing the left joint from other or unspecified knee involvement. 1 2 4

Plain-language overview

The diagnosis concept M02.362 applies to Reiter's disease localized to the left knee, and the terminology record classifies this condition's semantic type as a Disease or Syndrome. 1

What this code represents

Code M02.362 represents Reiter's disease of the left knee and exists as a narrower concept beneath the parent terminology entry M02.36 for Reiter's disease of the knee. 1

The diagnosis M02.362 is distinct from code M02.369, because M02.369 is designated for Reiter's disease of an unspecified knee when laterality is not documented. 3 4

Coding details

The official terminology record for M02.362 maintains an active status and includes published abbreviations matching the preferred name Reiter's disease, left knee. 1

Documentation considerations

Clinical documentation must explicitly identify the left knee to utilize M02.362, whereas insufficient laterality documentation necessitates using the unspecified knee code M02.369. 3

If provider documentation does not specify right or left knee involvement for Reiter's disease, coding guidance advises querying the provider to determine correct laterality. 3

Coverage and utilization context

While the unspecified knee code M02.369 maps to specific risk adjustment models with a community non-dual aged RAF of 0.268, the supplied sources do not provide a corresponding risk score for M02.362. 3

What the sources add

The National Cancer Institute terminology record establishes the official preferred name and hierarchical parent for M02.362, while an external medical coding resource demonstrates its placement alongside right and unspecified knee variants. 1 4

Sources

1. ICD-10-CM M02.362 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
3. 2026 ICD-10-CM M02.369: Reiter's disease | HCC 94 — hccbuddy.com; accessed 2026-07-27.
4. M02.36 - Reiter's disease, knee | ICD-10-CM — unboundmedicine.com; accessed 2026-07-27.