---
title: "ICD-10-CM M17.5: Other unilateral secondary osteoarthritis… | BillingBrief"
description: "ICD-10-CM code M17.5: Other unilateral secondary osteoarthritis of knee. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/m17.5/"
language: "en"
---

# M17.5 Other unilateral secondary osteoarthritis of knee

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Other unilateral secondary osteoarthritis of knee

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Also covers

-   Secondary osteoarthritis of knee NOS

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   osteoarthritis of spine (M47.-)

## Related codes

-   [`M17.11` Unilateral primary osteoarthritis, right knee ICD-10-CM](https://billingbrief.com/icd10/m17.11/)
-   [`M17.12` Unilateral primary osteoarthritis, left knee ICD-10-CM](https://billingbrief.com/icd10/m17.12/)
-   [`M17.2` Bilateral post-traumatic osteoarthritis of knee ICD-10-CM](https://billingbrief.com/icd10/m17.2/)
-   [`M17.30` Unilateral post-traumatic osteoarthritis, unspecified knee ICD-10-CM](https://billingbrief.com/icd10/m17.30/)
-   [`M17.31` Unilateral post-traumatic osteoarthritis, right knee ICD-10-CM](https://billingbrief.com/icd10/m17.31/)
-   [`M17.32` Unilateral post-traumatic osteoarthritis, left knee ICD-10-CM](https://billingbrief.com/icd10/m17.32/)
-   [`M17.4` Other bilateral secondary osteoarthritis of knee ICD-10-CM](https://billingbrief.com/icd10/m17.4/)
-   [`M17.9` Osteoarthritis of knee, unspecified ICD-10-CM](https://billingbrief.com/icd10/m17.9/)

## Common questions

### Is M17.5 a billable code?

Yes. M17.5 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

M17 Osteoarthritis of knee

Chapter

Diseases of the musculoskeletal system and connective tissue

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).