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M99Non-billableSave

M99 - Biomechanical lesions, not elsewhere classified

ICD-10-CM Chapter 13: Diseases of the musculoskeletal system and connective tissue · M99 Biomechanical lesions, not elsewhere classified (M99) · Top-level category · FY2027

Coding Guidance

M99 is a non-billable heading. Report one of the 10 more specific codes below.

Includes, Excludes and Coding Notes

NotesFrom M99

Instructional notes from the ICD-10-CM tabular list.

  • This category should not be used if the condition can be classified elsewhere.
Excludes 2 — Not Included HereFrom Chapter M00-M99

Not part of this code; report both codes when the patient has both conditions.

  • 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)
NotesFrom Chapter M00-M99

Instructional notes from the ICD-10-CM tabular list.

  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More Specific Codes (10)

M99.0Segmental and somatic dysfunction→M99.1Subluxation complex (vertebral)→M99.2Subluxation stenosis of neural canal→M99.3Osseous stenosis of neural canal→M99.4Connective tissue stenosis of neural canal→M99.5Intervertebral disc stenosis of neural canal→M99.6Osseous and subluxation stenosis of intervertebral foramina→M99.7Connective tissue and disc stenosis of intervertebral foramina→M99.8Other biomechanical lesions→M99.9Biomechanical lesion, unspecified→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with M99.