M19.90 – Unspecified osteoarthritis, unspecified site

Read about M19.90, the ICD-10-CM code for unspecified osteoarthritis at an unspecified site.

By Karina Jimenea on Aug 8, 2025.

Fact Checked by Ericka Pingol.

Use Code

M19.90 diagnosis code: Unspecified osteoarthritis, unspecified site

The M19.90 code is specific to the ICD-10-CM system healthcare professionals use. it falls under the broader category of ICD code Diseases of the musculoskeletal system and connective tissue (M00-M99).
This code denotes 'Unspecified osteoarthritis, unspecified site,' indicating a diagnosis of osteoarthritis where the precise form or location hasn't been determined.
The diagnosis corresponding to M19.90 involves osteoarthritis, a common type of arthritis.
The M19.90 code is generally applied when the patient has been diagnosed with osteoarthritis, arthritis NOS, and arthritis NOS, but additional specifics about the condition's form or location are unavailable.
Although it covers any site, this code is most commonly associated with the joints in the hands, knees, hips, and spine due to osteoarthritis in these areas.

Is M19.90 billable?

Yes, M19.90 is a billable ICD-10 code used to specify a diagnosis of unspecified osteoarthritis unspecified site.

Clinical information

Osteoarthritis is a degenerative joint condition, which is the most prevalent type of arthritis, particularly among older adults. It is believed to arise not simply from aging, but from biochemical changes and mechanical stress impacting the articular cartilage.
OA is characterized by the wearing down of the protective cartilage that cushions the ends of bones and the breakdown of the underlying bone.
M19.90 ICD 10 code is utilized when the patient has been diagnosed with osteoarthritis, a condition marked by cartilage breakdown causing pain, swelling, and problems moving the joint.
This ICD 10 M19.90 diagnosis can be made based on patient history, physical examination, and imaging studies.
The condition can affect any joint in the body but is most common in the hands, knees, hips, and spine.

Synonyms include

Degenerative joint disease
Arthrosis
Multiple joints osteoarthritis
Osteoarthritis of right sacroiliac joint
Osteoarthritis of left sacroiliac joint
Osteoarthritis or OA
Degenerative arthritis
Wear and tear arthritis

Other ICD-10 codes commonly used for osteoarthritis

M16.1: Unilateral primary osteoarthritis of hip
M19.279: Secondary osteoarthritis, unspecified ankle and foot
M16.4: Bilateral post-traumatic osteoarthritis of hip
M19.91: Primary osteoarthritis, unspecified site
M19.92: Post-traumatic osteoarthritis, unspecified site
M19.93: Secondary osteoarthritis, unspecified site

Commonly asked questions

Use the M19.90 diagnosis code when a patient presents with symptoms of osteoarthritis but specific information about the type or location of the condition is not available.

The treatments for conditions coded as M19.90 aim to control symptoms and improve joint function. They may include lifestyle changes, physical therapy, medications, or in severe cases, surgery.

The ICD-10 code M19.90 refers to 'Unspecified osteoarthritis, unspecified site.' It's used when a patient has osteoarthritis, but the exact type or location is unknown.

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