M99 Biomechanical lesions, not elsewhere classified

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Biomechanical lesions, not elsewhere classified is M99 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
M99: Biomechanical lesions, not elsewhere classified (M99)
Category M99
101 codes (91 billable)
FY2026 Status
Stable since FY2024

Notes

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

Official Coding Guidelines

Chapter 13 header

13. Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.13
Osteoporosis without pathological fracture (M81)

Category M81, Osteoporosis without current pathological fracture, is for use for patients with osteoporosis who do not currently have a pathologic fracture due to the osteoporosis, even if they have had a fracture in the past. For patients with a history of osteoporosis fractures, status code Z87.310, Personal history of (healed) osteoporosis fracture, should follow the code from M81.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.13.d.1

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

More Specific Codes

M99.0 Segmental and somatic dysfunction M99.00 Segmental and somatic dysfunction of head region M99.01 Segmental and somatic dysfunction of cervical region M99.02 Segmental and somatic dysfunction of thoracic region M99.03 Segmental and somatic dysfunction of lumbar region M99.04 Segmental and somatic dysfunction of sacral region M99.05 Segmental and somatic dysfunction of pelvic region M99.06 Segmental and somatic dysfunction of lower extremity M99.07 Segmental and somatic dysfunction of upper extremity M99.08 Segmental and somatic dysfunction of rib cage M99.09 Segmental and somatic dysfunction of abdomen and other regions M99.1 Subluxation complex (vertebral) M99.10 Subluxation complex (vertebral) of head region M99.11 Subluxation complex (vertebral) of cervical region M99.12 Subluxation complex (vertebral) of thoracic region M99.13 Subluxation complex (vertebral) of lumbar region M99.14 Subluxation complex (vertebral) of sacral region M99.15 Subluxation complex (vertebral) of pelvic region M99.16 Subluxation complex (vertebral) of lower extremity M99.17 Subluxation complex (vertebral) of upper extremity M99.18 Subluxation complex (vertebral) of rib cage M99.19 Subluxation complex (vertebral) of abdomen and other regions M99.2 Subluxation stenosis of neural canal M99.20 Subluxation stenosis of neural canal of head region M99.21 Subluxation stenosis of neural canal of cervical region M99.22 Subluxation stenosis of neural canal of thoracic region M99.23 Subluxation stenosis of neural canal of lumbar region M99.24 Subluxation stenosis of neural canal of sacral region M99.25 Subluxation stenosis of neural canal of pelvic region M99.26 Subluxation stenosis of neural canal of lower extremity

Related Codes in M99

M99.0 Segmental and somatic dysfunction M99.00 Segmental and somatic dysfunction of head region M99.01 Segmental and somatic dysfunction of cervical region M99.02 Segmental and somatic dysfunction of thoracic region M99.03 Segmental and somatic dysfunction of lumbar region M99.04 Segmental and somatic dysfunction of sacral region M99.05 Segmental and somatic dysfunction of pelvic region M99.06 Segmental and somatic dysfunction of lower extremity M99.07 Segmental and somatic dysfunction of upper extremity M99.08 Segmental and somatic dysfunction of rib cage M99.09 Segmental and somatic dysfunction of abdomen and other regions M99.1 Subluxation complex (vertebral) M99.10 Subluxation complex (vertebral) of head region M99.11 Subluxation complex (vertebral) of cervical region M99.12 Subluxation complex (vertebral) of thoracic region M99.13 Subluxation complex (vertebral) of lumbar region M99.14 Subluxation complex (vertebral) of sacral region M99.15 Subluxation complex (vertebral) of pelvic region M99.16 Subluxation complex (vertebral) of lower extremity M99.17 Subluxation complex (vertebral) of upper extremity
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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