ICD-10-CM Diagnosis Code M65.8 - Other synovitis and tenosynovitis (original) (raw)

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ICD List 2025-2026 Edition

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Other synovitis and tenosynovitis

ICD-10-CM Code:

M65.8

ICD-10 Code for:

Other synovitis and tenosynovitis

Is Billable?

Not Valid for Submission

Code Navigator:

M65.8 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity from the list below for a diagnosis of other synovitis and tenosynovitis. The code is not specific and is NOT valid for the year 2026 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Non-specific codes like M65.8 require more digits to indicate the appropriate level of specificity. Consider using any of the following billable codes with a higher level of specificity when coding for other synovitis and tenosynovitis:

Use M65.80 for Other synovitis and tenosynovitis, unspecified site

M65.81 for Other synovitis and tenosynovitis, shoulder

Use M65.811 for Other synovitis and tenosynovitis, right shoulder

Use M65.812 for Other synovitis and tenosynovitis, left shoulder

Use M65.819 for Other synovitis and tenosynovitis, unspecified shoulder

M65.82 for Other synovitis and tenosynovitis, upper arm

Use M65.821 for Other synovitis and tenosynovitis, right upper arm

Use M65.822 for Other synovitis and tenosynovitis, left upper arm

Use M65.829 for Other synovitis and tenosynovitis, unspecified upper arm

M65.83 for Other synovitis and tenosynovitis, forearm

Use M65.831 for Other synovitis and tenosynovitis, right forearm

Use M65.832 for Other synovitis and tenosynovitis, left forearm

Use M65.839 for Other synovitis and tenosynovitis, unspecified forearm

M65.84 for Other synovitis and tenosynovitis, hand

Use M65.841 for Other synovitis and tenosynovitis, right hand

Use M65.842 for Other synovitis and tenosynovitis, left hand

Use M65.849 for Other synovitis and tenosynovitis, unspecified hand

M65.85 for Other synovitis and tenosynovitis, thigh

Use M65.851 for Other synovitis and tenosynovitis, right thigh

Use M65.852 for Other synovitis and tenosynovitis, left thigh

Use M65.859 for Other synovitis and tenosynovitis, unspecified thigh

M65.86 for Other synovitis and tenosynovitis, lower leg

Use M65.861 for Other synovitis and tenosynovitis, right lower leg

Use M65.862 for Other synovitis and tenosynovitis, left lower leg

Use M65.869 for Other synovitis and tenosynovitis, unspecified lower leg

M65.87 for Other synovitis and tenosynovitis, ankle and foot

Use M65.871 for Other synovitis and tenosynovitis, right ankle and foot

Use M65.872 for Other synovitis and tenosynovitis, left ankle and foot

Use M65.879 for Other synovitis and tenosynovitis, unspecified ankle and foot

Use M65.88 for Other synovitis and tenosynovitis, other site

Use M65.89 for Other synovitis and tenosynovitis, multiple sites

  1. Code Information
  2. Specific Coding
  3. Tabular List of Diseases and Injuries
  4. Index to Diseases and Injuries References
  6. Patient Education
  7. Other Codes Used Similar Conditions
  8. Code History

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

References found for this diagnosis code in the External Cause of Injuries Index:

Joint Disorders

What are joints?

Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too.

But joints are more than bones. They include the soft tissues around them, such as cartilage, tendons and ligaments. Cartilage is the hard slippery flexible tissue that covers the ends of your bones at a joint. Tendons are tough, flexible bands that connect your muscles to your bones so you can move your joints. Ligaments connect the bones of the joint to each other to keep them stable when you move.

What are joint disorders?

Joint disorders are diseases or injuries that affect your joints. Injuries can happen because of overuse of a joint. Or you could have a sudden injury, such as an accident or a sports injury.

What diseases can affect the joints?

Many diseases can affect the joints. They often cause joint pain and make your joints stiff, red, or swollen. Most of them are chronic. That means they last a long time. Some may never go away completely. Some of the diseases that affect the joints include:

Treatments are different depending on the disease. But most treatments include medicines and therapies to relieve pain and other symptoms.

What types of joint disorders happen from sudden injuries?

Joint disorders from sudden injuries include:

Treatment depends on the type of injury. You can treat many sports injuries at home. But you should call your health care provider if you:

What types of joint disorders happen from overuse?

Overuse injuries usually damage the soft tissues of the joint. They can happen when you work a joint too hard by doing the same movements over and over. For example, you could get an overuse injury from playing a musical instrument, playing sports, or doing certain jobs, such as carpentry or painting.

Joint overuse injuries include:

The treatments for bursitis, tendinitis, and chronic strain are often the same. They usually include rest, keeping the injured joint higher than your heart, and taking medicine to reduce swelling. Your provider may recommend gentle exercise and other treatment. In some cases, your provider may suggest an injection (a shot) of medicine into the joint. If these do not help, you may need surgery.

How can I keep my joints healthy?

Getting enough physical activity is one of the most important things you can do to prevent or slow joint disorders. Activity strengthens the muscles around your joints and helps them work better.

When you play sports, wear the right equipment to protect your joints, such as knee pads. If you already have joint problems, ask your provider what type of activities are best for you.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

[Learn More in MedlinePlus]

Tendinitis

Tendons are flexible bands of tissue that connect muscles to bones. They help your muscles move your bones. Tendinitis is the severe swelling of a tendon.

Tendinitis usually happens after repeated injury to an area such as the wrist or ankle. It causes pain and soreness around a joint. Some common forms of tendinitis are named after the sports that increase their risk. They include tennis elbow, golfer's elbow, pitcher's shoulder, swimmer's shoulder, and jumper's knee.

Doctors diagnose tendinitis with your medical history, a physical exam, and imaging tests. The first step in treatment is to reduce pain and swelling. Rest, wrapping or elevating the affected area, and medicines can help. Ice is helpful for recent, severe injuries. Other treatments include ultrasound, physical therapy, steroid injections, and surgery.

[Learn More in MedlinePlus]