Chapter 13

M00–M99: Diseases of the Musculoskeletal System and Connective Tissue

Diseases of the Musculoskeletal System and Connective Tissue diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Internal Codes
  • M86.572

    Other chronic hematogenous osteomyelitis, left ankle and foot

  • M86.579

    Other chronic hematogenous osteomyelitis, unspecified ankle and foot

  • M86.58

    Other chronic hematogenous osteomyelitis, other site

  • M86.59

    Other chronic hematogenous osteomyelitis, multiple sites

  • M86.6

    Other chronic osteomyelitis

  • M86.60

    Other chronic osteomyelitis, unspecified site

  • M86.61

    Other chronic osteomyelitis, shoulder

  • M86.611

    Other chronic osteomyelitis, right shoulder

  • M86.612

    Other chronic osteomyelitis, left shoulder

  • M86.619

    Other chronic osteomyelitis, unspecified shoulder

  • M86.62

    Other chronic osteomyelitis, humerus

  • M86.621

    Other chronic osteomyelitis, right humerus

  • M86.622

    Other chronic osteomyelitis, left humerus

  • M86.629

    Other chronic osteomyelitis, unspecified humerus

  • M86.63

    Other chronic osteomyelitis, radius and ulna

  • M86.631

    Other chronic osteomyelitis, right radius and ulna

  • M86.632

    Other chronic osteomyelitis, left radius and ulna

  • M86.639

    Other chronic osteomyelitis, unspecified radius and ulna

  • M86.64

    Other chronic osteomyelitis, hand

  • M86.641

    Other chronic osteomyelitis, right hand

  • M86.642

    Other chronic osteomyelitis, left hand

  • M86.649

    Other chronic osteomyelitis, unspecified hand

  • M86.65

    Other chronic osteomyelitis, thigh

  • M86.651

    Other chronic osteomyelitis, right thigh

  • M86.652

    Other chronic osteomyelitis, left thigh

  • M86.659

    Other chronic osteomyelitis, unspecified thigh

  • M86.66

    Other chronic osteomyelitis, tibia and fibula

  • M86.661

    Other chronic osteomyelitis, right tibia and fibula

  • M86.662

    Other chronic osteomyelitis, left tibia and fibula

  • M86.669

    Other chronic osteomyelitis, unspecified tibia and fibula

  • M86.67

    Other chronic osteomyelitis, ankle and foot

  • M86.671

    Other chronic osteomyelitis, right ankle and foot

  • M86.672

    Other chronic osteomyelitis, left ankle and foot

  • M86.679

    Other chronic osteomyelitis, unspecified ankle and foot

  • M86.68

    Other chronic osteomyelitis, other site

  • M86.69

    Other chronic osteomyelitis, multiple sites

  • M86.8

    Other osteomyelitis

  • M86.8X

    Other osteomyelitis

  • M86.8X0

    Other osteomyelitis, multiple sites

  • M86.8X1

    Other osteomyelitis, shoulder

  • M86.8X2

    Other osteomyelitis, upper arm

  • M86.8X3

    Other osteomyelitis, forearm

  • M86.8X4

    Other osteomyelitis, hand

  • M86.8X5

    Other osteomyelitis, thigh

  • M86.8X6

    Other osteomyelitis, lower leg

  • M86.8X7

    Other osteomyelitis, ankle and foot

  • M86.8X8

    Other osteomyelitis, other site

  • M86.8X9

    Other osteomyelitis, unspecified sites

  • M86.9

    Osteomyelitis, unspecified

  • M87

    Osteonecrosis

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