2021 ICD-10-CM Code M1A.06

Idiopathic chronic gout, knee

Version 2021
Non-Billable Code

Not Valid for Submission

M1A.06 is a "header" nonspecific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of idiopathic chronic gout, knee. The code is NOT valid for the year 2021 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.

Short Description:Idiopathic chronic gout, knee
Long Description:Idiopathic chronic gout, knee

Code Classification

Specific Coding for Idiopathic chronic gout, knee

Header codes like M1A.06 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for idiopathic chronic gout, knee:

  • M1A.061 - Idiopathic chronic gout, right knee
  • M1A.0610 - Idiopathic chronic gout, right knee, without tophus (tophi)
  • M1A.0611 - Idiopathic chronic gout, right knee, with tophus (tophi)
  • M1A.062 - Idiopathic chronic gout, left knee
  • M1A.0620 - Idiopathic chronic gout, left knee, without tophus (tophi)
  • M1A.0621 - Idiopathic chronic gout, left knee, with tophus (tophi)
  • M1A.069 - Idiopathic chronic gout, unspecified knee
  • M1A.0690 - Idiopathic chronic gout, unspecified knee, without tophus (tophi)
  • M1A.0691 - Idiopathic chronic gout, unspecified knee, with tophus (tophi)

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code M1A.06 are found in the index:

Information for Patients


Also called: Gouty arthritis

Gout is a common, painful form of arthritis. It causes swollen, red, hot and stiff joints.

Gout happens when uric acid builds up in your body. Uric acid comes from the breakdown of substances called purines. Purines are in your body's tissues and in foods, such as liver, dried beans and peas, and anchovies. Normally, uric acid dissolves in the blood. It passes through the kidneys and out of the body in urine. But sometimes uric acid can build up and form needle-like crystals. When they form in your joints, it is very painful. The crystals can also cause kidney stones.

Often, gout first attacks your big toe. It can also attack ankles, heels, knees, wrists, fingers, and elbows. At first, gout attacks usually get better in days. Eventually, attacks last longer and happen more often.

You are more likely to get gout if you

Gout can be hard to diagnose. Your doctor may take a sample of fluid from an inflamed joint to look for crystals. You can treat gout with medicines.

Pseudogout has similar symptoms and is sometimes confused with gout. However, it is caused by calcium phosphate, not uric acid.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

[Learn More]

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)