ICD-10-CM Tabular Index · Chapter 13 · FY 2026 M08

Juvenile arthritis (M08) ICD-10-CM

The M08 code range covers juvenile arthritis with 166 ICD-10-CM diagnosis codes. 125 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.

✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
166
Diagnosis Codes
125
Billable Codes
M08
Code Range
M05–M14
Parent Section

Code Also

A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.

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.

ICD-10-CM

Codes in the M08 Range 166 codes · 125 billable

166 of 166 shown
  • M08 Juvenile arthritisNon-billable
  • M08.0 Unspecified juvenile rheumatoid arthritisNon-billable
  • M08.00 Unspecified juvenile rheumatoid arthritis of unspecified site
  • M08.01 Unspecified juvenile rheumatoid arthritis, shoulderNon-billable
  • M08.011 Unspecified juvenile rheumatoid arthritis, right shoulder
  • M08.012 Unspecified juvenile rheumatoid arthritis, left shoulder
  • M08.019 Unspecified juvenile rheumatoid arthritis, unspecified shoulder
  • M08.02 Unspecified juvenile rheumatoid arthritis of elbowNon-billable
  • M08.021 Unspecified juvenile rheumatoid arthritis, right elbow
  • M08.022 Unspecified juvenile rheumatoid arthritis, left elbow
  • M08.029 Unspecified juvenile rheumatoid arthritis, unspecified elbow
  • M08.03 Unspecified juvenile rheumatoid arthritis, wristNon-billable
  • M08.031 Unspecified juvenile rheumatoid arthritis, right wrist
  • M08.032 Unspecified juvenile rheumatoid arthritis, left wrist
  • M08.039 Unspecified juvenile rheumatoid arthritis, unspecified wrist
  • M08.04 Unspecified juvenile rheumatoid arthritis, handNon-billable
  • M08.041 Unspecified juvenile rheumatoid arthritis, right hand
  • M08.042 Unspecified juvenile rheumatoid arthritis, left hand
  • M08.049 Unspecified juvenile rheumatoid arthritis, unspecified hand
  • M08.05 Unspecified juvenile rheumatoid arthritis, hipNon-billable
  • M08.051 Unspecified juvenile rheumatoid arthritis, right hip
  • M08.052 Unspecified juvenile rheumatoid arthritis, left hip
  • M08.059 Unspecified juvenile rheumatoid arthritis, unspecified hip
  • M08.06 Unspecified juvenile rheumatoid arthritis, kneeNon-billable
  • M08.061 Unspecified juvenile rheumatoid arthritis, right knee
  • M08.062 Unspecified juvenile rheumatoid arthritis, left knee
  • M08.069 Unspecified juvenile rheumatoid arthritis, unspecified knee
  • M08.07 Unspecified juvenile rheumatoid arthritis, ankle and footNon-billable
  • M08.071 Unspecified juvenile rheumatoid arthritis, right ankle and foot
  • M08.072 Unspecified juvenile rheumatoid arthritis, left ankle and foot
  • M08.079 Unspecified juvenile rheumatoid arthritis, unspecified ankle and foot
  • M08.08 Unspecified juvenile rheumatoid arthritis, vertebrae
  • M08.09 Unspecified juvenile rheumatoid arthritis, multiple sites
  • M08.0A Unspecified juvenile rheumatoid arthritis, other specified site
  • M08.1 Juvenile ankylosing spondylitis
  • M08.2 Juvenile rheumatoid arthritis with systemic onsetNon-billable
  • M08.20 Juvenile rheumatoid arthritis with systemic onset, unspecified site
  • M08.21 Juvenile rheumatoid arthritis with systemic onset, shoulderNon-billable
  • M08.211 Juvenile rheumatoid arthritis with systemic onset, right shoulder
  • M08.212 Juvenile rheumatoid arthritis with systemic onset, left shoulder
  • M08.219 Juvenile rheumatoid arthritis with systemic onset, unspecified shoulder
  • M08.22 Juvenile rheumatoid arthritis with systemic onset, elbowNon-billable
  • M08.221 Juvenile rheumatoid arthritis with systemic onset, right elbow
  • M08.222 Juvenile rheumatoid arthritis with systemic onset, left elbow
  • M08.229 Juvenile rheumatoid arthritis with systemic onset, unspecified elbow
  • M08.23 Juvenile rheumatoid arthritis with systemic onset, wristNon-billable
  • M08.231 Juvenile rheumatoid arthritis with systemic onset, right wrist
  • M08.232 Juvenile rheumatoid arthritis with systemic onset, left wrist
  • M08.239 Juvenile rheumatoid arthritis with systemic onset, unspecified wrist
  • M08.24 Juvenile rheumatoid arthritis with systemic onset, handNon-billable
  • M08.241 Juvenile rheumatoid arthritis with systemic onset, right hand
  • M08.242 Juvenile rheumatoid arthritis with systemic onset, left hand
  • M08.249 Juvenile rheumatoid arthritis with systemic onset, unspecified hand
  • M08.25 Juvenile rheumatoid arthritis with systemic onset, hipNon-billable
  • M08.251 Juvenile rheumatoid arthritis with systemic onset, right hip
  • M08.252 Juvenile rheumatoid arthritis with systemic onset, left hip
  • M08.259 Juvenile rheumatoid arthritis with systemic onset, unspecified hip
  • M08.26 Juvenile rheumatoid arthritis with systemic onset, kneeNon-billable
  • M08.261 Juvenile rheumatoid arthritis with systemic onset, right knee
  • M08.262 Juvenile rheumatoid arthritis with systemic onset, left knee
  • M08.269 Juvenile rheumatoid arthritis with systemic onset, unspecified knee
  • M08.27 Juvenile rheumatoid arthritis with systemic onset, ankle and footNon-billable
  • M08.271 Juvenile rheumatoid arthritis with systemic onset, right ankle and foot
  • M08.272 Juvenile rheumatoid arthritis with systemic onset, left ankle and foot
  • M08.279 Juvenile rheumatoid arthritis with systemic onset, unspecified ankle and foot
  • M08.28 Juvenile rheumatoid arthritis with systemic onset, vertebrae
  • M08.29 Juvenile rheumatoid arthritis with systemic onset, multiple sites
  • M08.2A Juvenile rheumatoid arthritis with systemic onset, other specified site
  • M08.3 Juvenile rheumatoid polyarthritis (seronegative)
  • M08.4 Pauciarticular juvenile rheumatoid arthritisNon-billable
  • M08.40 Pauciarticular juvenile rheumatoid arthritis, unspecified site
  • M08.41 Pauciarticular juvenile rheumatoid arthritis, shoulderNon-billable
  • M08.411 Pauciarticular juvenile rheumatoid arthritis, right shoulder
  • M08.412 Pauciarticular juvenile rheumatoid arthritis, left shoulder
  • M08.419 Pauciarticular juvenile rheumatoid arthritis, unspecified shoulder
  • M08.42 Pauciarticular juvenile rheumatoid arthritis, elbowNon-billable
  • M08.421 Pauciarticular juvenile rheumatoid arthritis, right elbow
  • M08.422 Pauciarticular juvenile rheumatoid arthritis, left elbow
  • M08.429 Pauciarticular juvenile rheumatoid arthritis, unspecified elbow
  • M08.43 Pauciarticular juvenile rheumatoid arthritis, wristNon-billable
  • M08.431 Pauciarticular juvenile rheumatoid arthritis, right wrist
  • M08.432 Pauciarticular juvenile rheumatoid arthritis, left wrist
  • M08.439 Pauciarticular juvenile rheumatoid arthritis, unspecified wrist
  • M08.44 Pauciarticular juvenile rheumatoid arthritis, handNon-billable
  • M08.441 Pauciarticular juvenile rheumatoid arthritis, right hand
  • M08.442 Pauciarticular juvenile rheumatoid arthritis, left hand
  • M08.449 Pauciarticular juvenile rheumatoid arthritis, unspecified hand
  • M08.45 Pauciarticular juvenile rheumatoid arthritis, hipNon-billable
  • M08.451 Pauciarticular juvenile rheumatoid arthritis, right hip
  • M08.452 Pauciarticular juvenile rheumatoid arthritis, left hip
  • M08.459 Pauciarticular juvenile rheumatoid arthritis, unspecified hip
  • M08.46 Pauciarticular juvenile rheumatoid arthritis, kneeNon-billable
  • M08.461 Pauciarticular juvenile rheumatoid arthritis, right knee
  • M08.462 Pauciarticular juvenile rheumatoid arthritis, left knee
  • M08.469 Pauciarticular juvenile rheumatoid arthritis, unspecified knee
  • M08.47 Pauciarticular juvenile rheumatoid arthritis, ankle and footNon-billable
  • M08.471 Pauciarticular juvenile rheumatoid arthritis, right ankle and foot
  • M08.472 Pauciarticular juvenile rheumatoid arthritis, left ankle and foot
  • M08.479 Pauciarticular juvenile rheumatoid arthritis, unspecified ankle and foot
  • M08.48 Pauciarticular juvenile rheumatoid arthritis, vertebrae
  • M08.4A Pauciarticular juvenile rheumatoid arthritis, other specified site
  • M08.8 Other juvenile arthritisNon-billable
  • M08.80 Other juvenile arthritis, unspecified site
  • M08.81 Other juvenile arthritis, shoulderNon-billable
  • M08.811 Other juvenile arthritis, right shoulder
  • M08.812 Other juvenile arthritis, left shoulder
  • M08.819 Other juvenile arthritis, unspecified shoulder
  • M08.82 Other juvenile arthritis, elbowNon-billable
  • M08.821 Other juvenile arthritis, right elbow
  • M08.822 Other juvenile arthritis, left elbow
  • M08.829 Other juvenile arthritis, unspecified elbow
  • M08.83 Other juvenile arthritis, wristNon-billable
  • M08.831 Other juvenile arthritis, right wrist
  • M08.832 Other juvenile arthritis, left wrist
  • M08.839 Other juvenile arthritis, unspecified wrist
  • M08.84 Other juvenile arthritis, handNon-billable
  • M08.841 Other juvenile arthritis, right hand
  • M08.842 Other juvenile arthritis, left hand
  • M08.849 Other juvenile arthritis, unspecified hand
  • M08.85 Other juvenile arthritis, hipNon-billable
  • M08.851 Other juvenile arthritis, right hip
  • M08.852 Other juvenile arthritis, left hip
  • M08.859 Other juvenile arthritis, unspecified hip
  • M08.86 Other juvenile arthritis, kneeNon-billable
  • M08.861 Other juvenile arthritis, right knee
  • M08.862 Other juvenile arthritis, left knee
  • M08.869 Other juvenile arthritis, unspecified knee
  • M08.87 Other juvenile arthritis, ankle and footNon-billable
  • M08.871 Other juvenile arthritis, right ankle and foot
  • M08.872 Other juvenile arthritis, left ankle and foot
  • M08.879 Other juvenile arthritis, unspecified ankle and foot
  • M08.88 Other juvenile arthritis, other specified site
  • M08.89 Other juvenile arthritis, multiple sites
  • M08.9 Juvenile arthritis, unspecifiedNon-billable
  • M08.90 Juvenile arthritis, unspecified, unspecified site
  • M08.91 Juvenile arthritis, unspecified, shoulderNon-billable
  • M08.911 Juvenile arthritis, unspecified, right shoulder
  • M08.912 Juvenile arthritis, unspecified, left shoulder
  • M08.919 Juvenile arthritis, unspecified, unspecified shoulder
  • M08.92 Juvenile arthritis, unspecified, elbowNon-billable
  • M08.921 Juvenile arthritis, unspecified, right elbow
  • M08.922 Juvenile arthritis, unspecified, left elbow
  • M08.929 Juvenile arthritis, unspecified, unspecified elbow
  • M08.93 Juvenile arthritis, unspecified, wristNon-billable
  • M08.931 Juvenile arthritis, unspecified, right wrist
  • M08.932 Juvenile arthritis, unspecified, left wrist
  • M08.939 Juvenile arthritis, unspecified, unspecified wrist
  • M08.94 Juvenile arthritis, unspecified, handNon-billable
  • M08.941 Juvenile arthritis, unspecified, right hand
  • M08.942 Juvenile arthritis, unspecified, left hand
  • M08.949 Juvenile arthritis, unspecified, unspecified hand
  • M08.95 Juvenile arthritis, unspecified, hipNon-billable
  • M08.951 Juvenile arthritis, unspecified, right hip
  • M08.952 Juvenile arthritis, unspecified, left hip
  • M08.959 Juvenile arthritis, unspecified, unspecified hip
  • M08.96 Juvenile arthritis, unspecified, kneeNon-billable
  • M08.961 Juvenile arthritis, unspecified, right knee
  • M08.962 Juvenile arthritis, unspecified, left knee
  • M08.969 Juvenile arthritis, unspecified, unspecified knee
  • M08.97 Juvenile arthritis, unspecified, ankle and footNon-billable
  • M08.971 Juvenile arthritis, unspecified, right ankle and foot
  • M08.972 Juvenile arthritis, unspecified, left ankle and foot
  • M08.979 Juvenile arthritis, unspecified, unspecified ankle and foot
  • M08.98 Juvenile arthritis, unspecified, vertebrae
  • M08.99 Juvenile arthritis, unspecified, multiple sites
  • M08.9A Juvenile arthritis, unspecified, other specified site

Clinical Terms in This Code Range

Definitions from the National Library of Medicine for conditions coded in the M08 range.

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, 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, 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, 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, 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.

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.

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.

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).

Joints

Also known as articulations, these are points of connection between the ends of certain separate bones, or where the borders of other bones are juxtaposed.

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.

Macrophage Activation Syndrome

A serious complication of childhood systemic inflammatory disorders that is thought to be caused by excessive activation and proliferation of T-LYMPHOCYTES and MACROPHAGES. It is seen predominantly in children with systemic onset JUVENILE IDIOPATHIC ARTHRITIS.

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.

Spine

The spinal or vertebral column.

Spondylarthritis

Inflammation of the joints of the SPINE, the intervertebral articulations.

About the M08 Code Range

ICD-10 code M08 represents juvenile arthritis, a group of conditions affecting children with joint inflammation. These codes specify various types and locations of juvenile rheumatoid arthritis, including systemic onset, pauciarticular, polyarthritis, and ankylosing spondylitis.

The ICD-10 code for juvenile arthritis identifies conditions such as "Unspecified juvenile rheumatoid arthritis" (M08.0), "Juvenile ankylosing spondylitis" (M08.1), and "Juvenile rheumatoid arthritis with systemic onset" (M08.2). Specific sites like shoulder, elbow, wrist, hand, hip, knee, ankle, foot, and vertebrae are detailed with corresponding subcodes (e.g., M08.011 for right shoulder involvement). These codes also incorporate synonyms to clarify terms; for example, "Rheumatoid arthritis of temporomandibular joint" links to M08.00, aiding coders identifying conditions like chronic rheumatic arthritis or post-streptococcal reactive arthritis. Similarly, "Polyarticular juvenile idiopathic arthritis" relates to M08.3, and "Uveitis due to juvenile idiopathic arthritis" falls under M08.80, categorized as other juvenile arthritis.

Medical professionals and coders use these codes to precisely document juvenile arthritis types by onset, severity, and joint location, ensuring accurate clinical records and facilitating targeted treatment plans.

Questions About This Page

How many billable codes are in the M08 range?

Of the 166 codes in this range, 125 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.

What does the M08 range classify?

The range classifies juvenile arthritis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.

Related References

Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.