---
title: "ICD-10-CM M19.90: Unspecified osteoarthritis, unspecified… | BillingBrief"
description: "ICD-10-CM code M19.90: Unspecified osteoarthritis, unspecified site. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/m19.90/"
language: "en"
---

# M19.90 Unspecified osteoarthritis, unspecified site

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

**Official ICD-10-CM description:** Unspecified osteoarthritis, unspecified site

## 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

-   Arthrosis NOS
-   Arthritis NOS
-   Osteoarthritis NOS

### Excludes1

Not coded together with this code. The exception is when the two conditions are unrelated to each other.

-   polyarthritis (M15.-)

### Excludes2

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

-   arthrosis of spine (M47.-)
-   hallux rigidus (M20.2)
-   osteoarthritis of spine (M47.-)

## Related codes

-   [`M19.249` Secondary osteoarthritis, unspecified hand ICD-10-CM](https://billingbrief.com/icd10/m19.249/)
-   [`M19.271` Secondary osteoarthritis, right ankle and foot ICD-10-CM](https://billingbrief.com/icd10/m19.271/)
-   [`M19.272` Secondary osteoarthritis, left ankle and foot ICD-10-CM](https://billingbrief.com/icd10/m19.272/)
-   [`M19.279` Secondary osteoarthritis, unspecified ankle and foot ICD-10-CM](https://billingbrief.com/icd10/m19.279/)
-   [`M19.29` Secondary osteoarthritis, other specified site ICD-10-CM](https://billingbrief.com/icd10/m19.29/)
-   [`M19.91` Primary osteoarthritis, unspecified site ICD-10-CM](https://billingbrief.com/icd10/m19.91/)
-   [`M19.92` Post-traumatic osteoarthritis, unspecified site ICD-10-CM](https://billingbrief.com/icd10/m19.92/)
-   [`M19.93` Secondary osteoarthritis, unspecified site ICD-10-CM](https://billingbrief.com/icd10/m19.93/)

## Common questions

### Is M19.90 a billable code?

Yes. M19.90 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

M19 Other and unspecified osteoarthritis

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/).