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
  • M84.631D

    Pathological fracture in other disease, right ulna, subsequent encounter for fracture with routine healing

  • M84.631G

    Pathological fracture in other disease, right ulna, subsequent encounter for fracture with delayed healing

  • M84.631K

    Pathological fracture in other disease, right ulna, subsequent encounter for fracture with nonunion

  • M84.631P

    Pathological fracture in other disease, right ulna, subsequent encounter for fracture with malunion

  • M84.631S

    Pathological fracture in other disease, right ulna, sequela

  • M84.632

    Pathological fracture in other disease, left ulna

  • M84.632A

    Pathological fracture in other disease, left ulna, initial encounter for fracture

  • M84.632D

    Pathological fracture in other disease, left ulna, subsequent encounter for fracture with routine healing

  • M84.632G

    Pathological fracture in other disease, left ulna, subsequent encounter for fracture with delayed healing

  • M84.632K

    Pathological fracture in other disease, left ulna, subsequent encounter for fracture with nonunion

  • M84.632P

    Pathological fracture in other disease, left ulna, subsequent encounter for fracture with malunion

  • M84.632S

    Pathological fracture in other disease, left ulna, sequela

  • M84.633

    Pathological fracture in other disease, right radius

  • M84.633A

    Pathological fracture in other disease, right radius, initial encounter for fracture

  • M84.633D

    Pathological fracture in other disease, right radius, subsequent encounter for fracture with routine healing

  • M84.633G

    Pathological fracture in other disease, right radius, subsequent encounter for fracture with delayed healing

  • M84.633K

    Pathological fracture in other disease, right radius, subsequent encounter for fracture with nonunion

  • M84.633P

    Pathological fracture in other disease, right radius, subsequent encounter for fracture with malunion

  • M84.633S

    Pathological fracture in other disease, right radius, sequela

  • M84.634

    Pathological fracture in other disease, left radius

  • M84.634A

    Pathological fracture in other disease, left radius, initial encounter for fracture

  • M84.634D

    Pathological fracture in other disease, left radius, subsequent encounter for fracture with routine healing

  • M84.634G

    Pathological fracture in other disease, left radius, subsequent encounter for fracture with delayed healing

  • M84.634K

    Pathological fracture in other disease, left radius, subsequent encounter for fracture with nonunion

  • M84.634P

    Pathological fracture in other disease, left radius, subsequent encounter for fracture with malunion

  • M84.634S

    Pathological fracture in other disease, left radius, sequela

  • M84.639

    Pathological fracture in other disease, unspecified ulna and radius

  • M84.639A

    Pathological fracture in other disease, unspecified ulna and radius, initial encounter for fracture

  • M84.639D

    Pathological fracture in other disease, unspecified ulna and radius, subsequent encounter for fracture with routine healing

  • M84.639G

    Pathological fracture in other disease, unspecified ulna and radius, subsequent encounter for fracture with delayed healing

  • M84.639K

    Pathological fracture in other disease, unspecified ulna and radius, subsequent encounter for fracture with nonunion

  • M84.639P

    Pathological fracture in other disease, unspecified ulna and radius, subsequent encounter for fracture with malunion

  • M84.639S

    Pathological fracture in other disease, unspecified ulna and radius, sequela

  • M84.64

    Pathological fracture in other disease, hand

  • M84.641

    Pathological fracture in other disease, right hand

  • M84.641A

    Pathological fracture in other disease, right hand, initial encounter for fracture

  • M84.641D

    Pathological fracture in other disease, right hand, subsequent encounter for fracture with routine healing

  • M84.641G

    Pathological fracture in other disease, right hand, subsequent encounter for fracture with delayed healing

  • M84.641K

    Pathological fracture in other disease, right hand, subsequent encounter for fracture with nonunion

  • M84.641P

    Pathological fracture in other disease, right hand, subsequent encounter for fracture with malunion

  • M84.641S

    Pathological fracture in other disease, right hand, sequela

  • M84.642

    Pathological fracture in other disease, left hand

  • M84.642A

    Pathological fracture in other disease, left hand, initial encounter for fracture

  • M84.642D

    Pathological fracture in other disease, left hand, subsequent encounter for fracture with routine healing

  • M84.642G

    Pathological fracture in other disease, left hand, subsequent encounter for fracture with delayed healing

  • M84.642K

    Pathological fracture in other disease, left hand, subsequent encounter for fracture with nonunion

  • M84.642P

    Pathological fracture in other disease, left hand, subsequent encounter for fracture with malunion

  • M84.642S

    Pathological fracture in other disease, left hand, sequela

  • M84.649

    Pathological fracture in other disease, unspecified hand

  • M84.649A

    Pathological fracture in other disease, unspecified hand, initial encounter for fracture

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