M99.9 Biomechanical lesion, unspecified

Billable ICD-10-CM code, FY2026.

Applies from M99 Biomechanical lesions, not elsewhere classified

Notes

• This category should not be used if the condition can be classified elsewhere.

MS-DRG index

Defines the logic of DRG(s) 564-566 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 738.9 Acquired deformity of unspecified site (approximate)

Code annotations containing back-references to M99.9

Back-references to M99

• Type 1 Excludes: M43.5 Other recurrent vertebral dislocation ("biomechanical lesions NEC (M99.-)")

Diagnosis Index entries for M99.9

• Lesion (s) (nontraumatic) › biomechanical

Nearby codes

• M99.85 Other biomechanical lesions of pelvic region
• M99.86 Other biomechanical lesions of lower extremity
• M99.87 Other biomechanical lesions of upper extremity
• M99.88 Other biomechanical lesions of rib cage
• M99.89 Other biomechanical lesions of abdomen and other regions
• M99.9 Biomechanical lesion, unspecified (this code)