ICD-10-CM Code M13

Other arthritis

Version 2020 Non-Billable Code

Not Valid for Submission

M13 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of other arthritis. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

Short Description:Other arthritis
Long Description:Other arthritis

Consider the following ICD-10 codes with a higher level of specificity:

  • M13.0 - Polyarthritis, unspecified
  • M13.1 - Monoarthritis, not elsewhere classified
  • M13.10 - Monoarthritis, not elsewhere classified, unspecified site
  • M13.11 - Monoarthritis, not elsewhere classified, shoulder
  • M13.111 - Monoarthritis, not elsewhere classified, right shoulder
  • M13.112 - Monoarthritis, not elsewhere classified, left shoulder
  • M13.119 - Monoarthritis, not elsewhere classified, unspecified shoulder
  • M13.12 - Monoarthritis, not elsewhere classified, elbow
  • M13.121 - Monoarthritis, not elsewhere classified, right elbow
  • M13.122 - Monoarthritis, not elsewhere classified, left elbow
  • M13.129 - Monoarthritis, not elsewhere classified, unspecified elbow
  • M13.13 - Monoarthritis, not elsewhere classified, wrist
  • M13.131 - Monoarthritis, not elsewhere classified, right wrist
  • M13.132 - Monoarthritis, not elsewhere classified, left wrist
  • M13.139 - Monoarthritis, not elsewhere classified, unspecified wrist
  • M13.14 - Monoarthritis, not elsewhere classified, hand
  • M13.141 - Monoarthritis, not elsewhere classified, right hand
  • M13.142 - Monoarthritis, not elsewhere classified, left hand
  • M13.149 - Monoarthritis, not elsewhere classified, unspecified hand
  • M13.15 - Monoarthritis, not elsewhere classified, hip
  • M13.151 - Monoarthritis, not elsewhere classified, right hip
  • M13.152 - Monoarthritis, not elsewhere classified, left hip
  • M13.159 - Monoarthritis, not elsewhere classified, unspecified hip
  • M13.16 - Monoarthritis, not elsewhere classified, knee
  • M13.161 - Monoarthritis, not elsewhere classified, right knee
  • M13.162 - Monoarthritis, not elsewhere classified, left knee
  • M13.169 - Monoarthritis, not elsewhere classified, unspecified knee
  • M13.17 - Monoarthritis, not elsewhere classified, ankle and foot
  • M13.171 - Monoarthritis, not elsewhere classified, right ankle and foot
  • M13.172 - Monoarthritis, not elsewhere classified, left ankle and foot
  • M13.179 - Monoarthritis, not elsewhere classified, unspecified ankle and foot
  • M13.8 - Other specified arthritis
  • M13.80 - Other specified arthritis, unspecified site
  • M13.81 - Other specified arthritis, shoulder
  • M13.811 - Other specified arthritis, right shoulder
  • M13.812 - Other specified arthritis, left shoulder
  • M13.819 - Other specified arthritis, unspecified shoulder
  • M13.82 - Other specified arthritis, elbow
  • M13.821 - Other specified arthritis, right elbow
  • M13.822 - Other specified arthritis, left elbow
  • M13.829 - Other specified arthritis, unspecified elbow
  • M13.83 - Other specified arthritis, wrist
  • M13.831 - Other specified arthritis, right wrist
  • M13.832 - Other specified arthritis, left wrist
  • M13.839 - Other specified arthritis, unspecified wrist
  • M13.84 - Other specified arthritis, hand
  • M13.841 - Other specified arthritis, right hand
  • M13.842 - Other specified arthritis, left hand
  • M13.849 - Other specified arthritis, unspecified hand
  • M13.85 - Other specified arthritis, hip
  • M13.851 - Other specified arthritis, right hip
  • M13.852 - Other specified arthritis, left hip
  • M13.859 - Other specified arthritis, unspecified hip
  • M13.86 - Other specified arthritis, knee
  • M13.861 - Other specified arthritis, right knee
  • M13.862 - Other specified arthritis, left knee
  • M13.869 - Other specified arthritis, unspecified knee
  • M13.87 - Other specified arthritis, ankle and foot
  • M13.871 - Other specified arthritis, right ankle and foot
  • M13.872 - Other specified arthritis, left ankle and foot
  • M13.879 - Other specified arthritis, unspecified ankle and foot
  • M13.88 - Other specified arthritis, other site
  • M13.89 - Other specified arthritis, multiple sites

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code M13:

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

Clinical Information

  • CRYSTAL ARTHROPATHIES-. joint disorders that are characterized by accumulation of microcrystals in and around the joint including in the synovial fluid. they are classified according to the chemical nature of the crystals such as calcium pyrophosphate; basic calcium phosphates; and monosodium urate see uric acid.
  • ARTHRITIS-. acute or chronic inflammation of joints.
  • ARTHRITIS EXPERIMENTAL-. arthritis that is induced in experimental animals. immunological methods and infectious agents can be used to develop experimental arthritis models. these methods include injections of stimulators of the immune response such as an adjuvant adjuvants immunologic or collagen.
  • ARTHRITIS INFECTIOUS-. arthritis caused by bacteria; rickettsia; mycoplasma; viruses; fungi; or parasites.
  • ARTHRITIS JUVENILE-. arthritis in children with onset before 16 years of age. the terms juvenile rheumatoid arthritis jra and juvenile idiopathic arthritis jia refer to classification systems for chronic arthritis in children. only one subtype of juvenile arthritis polyarticular onset rheumatoid factor positive clinically resembles adult rheumatoid arthritis and is considered its childhood equivalent.
  • ARTHRITIS RHEUMATOID-. a chronic systemic disease primarily of the joints marked by inflammatory changes in the synovial membranes and articular structures widespread fibrinoid degeneration of the collagen fibers in mesenchymal tissues and by atrophy and rarefaction of bony structures. etiology is unknown but autoimmune mechanisms have been implicated.
  • LYME DISEASE-. an infectious disease caused by a spirochete borrelia burgdorferi which is transmitted chiefly by ixodes dammini see ixodes and pacificus ticks in the united states and ixodes ricinis see ixodes in europe. it is a disease with early and late cutaneous manifestations plus involvement of the nervous system heart eye and joints in variable combinations. the disease was formerly known as lyme arthritis and first discovered at old lyme connecticut.
  • OSTEOARTHRITIS-. a progressive degenerative joint disease the most common form of arthritis especially in older persons. the disease is thought to result not from the aging process but from biochemical changes and biomechanical stresses affecting articular cartilage. in the foreign literature it is often called osteoarthrosis deformans.
  • RHEUMATIC FEVER-. a febrile disease occurring as a delayed sequela of infections with streptococcus pyogenes. it is characterized by multiple focal inflammatory lesions of the connective tissue structures such as the heart blood vessels and joints polyarthritis and brain and by the presence of aschoff bodies in the myocardium and skin.
  • ARTHRITIS GOUTY-. arthritis especially of the great toe as a result of gout. acute gouty arthritis often is precipitated by trauma infection surgery etc. the initial attacks are usually monoarticular but later attacks are often polyarticular. acute and chronic gouty arthritis are associated with accumulation of monosodium urate in and around affected joints.
  • ARTHRITIS PSORIATIC-. a type of inflammatory arthritis associated with psoriasis often involving the axial joints and the peripheral terminal interphalangeal joints. it is characterized by the presence of hla b27 associated spondylarthropathy and the absence of rheumatoid factor.
  • ARTHRITIS ENCEPHALITIS VIRUS CAPRINE-. a species of lentivirus subgenus ovine caprine lentiviruses lentiviruses ovine caprine closely related to visna maedi virus and causing acute encephalomyelitis; chronic arthritis; pneumonia; mastitis; and glomerulonephritis in goats. it is transmitted mainly in the colostrum and milk.
  • ARTHRITIS REACTIVE-. an aseptic inflammatory arthritis developing secondary to a primary extra articular infection most typically of the gastrointestinal tract or urogenital system. the initiating trigger pathogens are usually shigella; salmonella; yersinia; campylobacter; or chlamydia trachomatis. reactive arthritis is strongly associated with hla b27 antigen.
  • SPONDYLARTHRITIS-. inflammation of the joints of the spine the intervertebral articulations.

Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Inflammatory polyarthropathies (M05-M14)
      • Other arthritis (M13)

Code History

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

Information for Patients


If you feel pain and stiffness in your body or have trouble moving around, you might have arthritis. Most kinds of arthritis cause pain and swelling in your joints. Joints are places where two bones meet, such as your elbow or knee. Over time, a swollen joint can become severely damaged. Some kinds of arthritis can also cause problems in your organs, such as your eyes or skin.

Types of arthritis include

  • Osteoarthritis is the most common type of arthritis. It's often related to aging or to an injury.
  • Autoimmune arthritis happens when your body's immune system attacks healthy cells in your body by mistake. Rheumatoid arthritis is the most common form of this kind of arthritis.
  • Juvenile arthritis is a type of arthritis that happens in children.
  • Infectious arthritis is an infection that has spread from another part of the body to the joint.
  • Psoriatic arthritis affects people with psoriasis.
  • Gout is a painful type of arthritis that happens when too much uric acid builds up in the body. It often starts in the big toe.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

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