2026 ICD-10-CM Diagnosis Code M99Biomechanical lesions, not elsewhere classified

ICD-10-CM Codes›M00–M99›M99›M99

ICD-10-CM M99
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M99 is a non-billable ICD-10-CM category code for biomechanical lesions, not elsewhere classified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M99.00, M99.01, M99.02, and M99.03.

Code Identity

ICD-10-CM Code
M99
Billable Status
No — Non-Billable Category
Code Describes
Biomechanical lesions, not elsewhere classified
Short Description
Biomechanical lesions, not elsewhere classified
Same as the full description in the CMS dataset.
Chapter
M99
Biomechanical lesions, not elsewhere classified

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM99Biomechanical lesions, not elsewhere classified
CategoryM99Biomechanical lesions, not elsewhere classified
This CodeM99Biomechanical lesions, not elsewhere classified

Specific Coding for Biomechanical lesions, not elsewhere classifiedOverview

Non-specific codes like M99 require more characters. Use one of these billable codes instead:

  • M99.0 for Segmental and somatic dysfunction

  • Use M99.00 for Segmental and somatic dysfunction of head region

  • Use M99.01 for Segmental and somatic dysfunction of cervical region

  • Use M99.02 for Segmental and somatic dysfunction of thoracic region

  • Use M99.03 for Segmental and somatic dysfunction of lumbar region

  • Use M99.04 for Segmental and somatic dysfunction of sacral region

  • Use M99.05 for Segmental and somatic dysfunction of pelvic region

  • Use M99.06 for Segmental and somatic dysfunction of lower extremity

  • Use M99.07 for Segmental and somatic dysfunction of upper extremity

  • Use M99.08 for Segmental and somatic dysfunction of rib cage

  • Use M99.09 for Segmental and somatic dysfunction of abdomen and other regions

  • M99.1 for Subluxation complex (vertebral)

  • Use M99.10 for Subluxation complex (vertebral) of head region

  • Use M99.11 for Subluxation complex (vertebral) of cervical region

  • Use M99.12 for Subluxation complex (vertebral) of thoracic region

  • Use M99.13 for Subluxation complex (vertebral) of lumbar region

  • Use M99.14 for Subluxation complex (vertebral) of sacral region

  • Use M99.15 for Subluxation complex (vertebral) of pelvic region

  • Use M99.16 for Subluxation complex (vertebral) of lower extremity

  • Use M99.17 for Subluxation complex (vertebral) of upper extremity

  • Use M99.18 for Subluxation complex (vertebral) of rib cage

  • Use M99.19 for Subluxation complex (vertebral) of abdomen and other regions

  • M99.2 for Subluxation stenosis of neural canal

  • Use M99.20 for Subluxation stenosis of neural canal of head region

  • Use M99.21 for Subluxation stenosis of neural canal of cervical region

  • Use M99.22 for Subluxation stenosis of neural canal of thoracic region

  • Use M99.23 for Subluxation stenosis of neural canal of lumbar region

  • Use M99.24 for Subluxation stenosis of neural canal of sacral region

  • Use M99.25 for Subluxation stenosis of neural canal of pelvic region

  • Use M99.26 for Subluxation stenosis of neural canal of lower extremity

  • Use M99.27 for Subluxation stenosis of neural canal of upper extremity

  • Use M99.28 for Subluxation stenosis of neural canal of rib cage

  • Use M99.29 for Subluxation stenosis of neural canal of abdomen and other regions

  • M99.3 for Osseous stenosis of neural canal

  • Use M99.30 for Osseous stenosis of neural canal of head region

  • Use M99.31 for Osseous stenosis of neural canal of cervical region

  • Use M99.32 for Osseous stenosis of neural canal of thoracic region

  • Use M99.33 for Osseous stenosis of neural canal of lumbar region

  • Use M99.34 for Osseous stenosis of neural canal of sacral region

  • Use M99.35 for Osseous stenosis of neural canal of pelvic region

  • Use M99.36 for Osseous stenosis of neural canal of lower extremity

  • Use M99.37 for Osseous stenosis of neural canal of upper extremity

  • Use M99.38 for Osseous stenosis of neural canal of rib cage

  • Use M99.39 for Osseous stenosis of neural canal of abdomen and other regions

  • M99.4 for Connective tissue stenosis of neural canal

  • Use M99.40 for Connective tissue stenosis of neural canal of head region

  • Use M99.41 for Connective tissue stenosis of neural canal of cervical region

  • Use M99.42 for Connective tissue stenosis of neural canal of thoracic region

  • Use M99.43 for Connective tissue stenosis of neural canal of lumbar region

  • Use M99.44 for Connective tissue stenosis of neural canal of sacral region

  • Use M99.45 for Connective tissue stenosis of neural canal of pelvic region

  • Use M99.46 for Connective tissue stenosis of neural canal of lower extremity

  • Use M99.47 for Connective tissue stenosis of neural canal of upper extremity

  • Use M99.48 for Connective tissue stenosis of neural canal of rib cage

  • Use M99.49 for Connective tissue stenosis of neural canal of abdomen and other regions

  • M99.5 for Intervertebral disc stenosis of neural canal

  • Use M99.50 for Intervertebral disc stenosis of neural canal of head region

  • Use M99.51 for Intervertebral disc stenosis of neural canal of cervical region

  • Use M99.52 for Intervertebral disc stenosis of neural canal of thoracic region

  • Use M99.53 for Intervertebral disc stenosis of neural canal of lumbar region

  • Use M99.54 for Intervertebral disc stenosis of neural canal of sacral region

  • Use M99.55 for Intervertebral disc stenosis of neural canal of pelvic region

  • Use M99.56 for Intervertebral disc stenosis of neural canal of lower extremity

  • Use M99.57 for Intervertebral disc stenosis of neural canal of upper extremity

  • Use M99.58 for Intervertebral disc stenosis of neural canal of rib cage

  • Use M99.59 for Intervertebral disc stenosis of neural canal of abdomen and other regions

  • M99.6 for Osseous and subluxation stenosis of intervertebral foramina

  • Use M99.60 for Osseous and subluxation stenosis of intervertebral foramina of head region

  • Use M99.61 for Osseous and subluxation stenosis of intervertebral foramina of cervical region

  • Use M99.62 for Osseous and subluxation stenosis of intervertebral foramina of thoracic region

  • Use M99.63 for Osseous and subluxation stenosis of intervertebral foramina of lumbar region

  • Use M99.64 for Osseous and subluxation stenosis of intervertebral foramina of sacral region

  • Use M99.65 for Osseous and subluxation stenosis of intervertebral foramina of pelvic region

  • Use M99.66 for Osseous and subluxation stenosis of intervertebral foramina of lower extremity

  • Use M99.67 for Osseous and subluxation stenosis of intervertebral foramina of upper extremity

  • Use M99.68 for Osseous and subluxation stenosis of intervertebral foramina of rib cage

  • Use M99.69 for Osseous and subluxation stenosis of intervertebral foramina of abdomen and other regions

  • M99.7 for Connective tissue and disc stenosis of intervertebral foramina

  • Use M99.70 for Connective tissue and disc stenosis of intervertebral foramina of head region

  • Use M99.71 for Connective tissue and disc stenosis of intervertebral foramina of cervical region

  • Use M99.72 for Connective tissue and disc stenosis of intervertebral foramina of thoracic region

  • Use M99.73 for Connective tissue and disc stenosis of intervertebral foramina of lumbar region

  • Use M99.74 for Connective tissue and disc stenosis of intervertebral foramina of sacral region

  • Use M99.75 for Connective tissue and disc stenosis of intervertebral foramina of pelvic region

  • Use M99.76 for Connective tissue and disc stenosis of intervertebral foramina of lower extremity

  • Use M99.77 for Connective tissue and disc stenosis of intervertebral foramina of upper extremity

  • Use M99.78 for Connective tissue and disc stenosis of intervertebral foramina of rib cage

  • Use M99.79 for Connective tissue and disc stenosis of intervertebral foramina of abdomen and other regions

  • M99.8 for Other biomechanical lesions

  • Use M99.80 for Other biomechanical lesions of head region

  • Use M99.81 for Other biomechanical lesions of cervical region

  • Use M99.82 for Other biomechanical lesions of thoracic region

  • Use M99.83 for Other biomechanical lesions of lumbar region

  • Use M99.84 for Other biomechanical lesions of sacral region

  • Use M99.85 for Other biomechanical lesions of pelvic region

  • Use M99.86 for Other biomechanical lesions of lower extremity

  • Use M99.87 for Other biomechanical lesions of upper extremity

  • Use M99.88 for Other biomechanical lesions of rib cage

  • Use M99.89 for Other biomechanical lesions of abdomen and other regions

  • Use M99.9 for Biomechanical lesion, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

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

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M99Overview

Is M99 (Biomechanical lesions, not elsewhere classified) a billable code?

No. This is a category header that groups the codes for biomechanical lesions, not elsewhere classified, and headers cannot be submitted on claims. Claims for biomechanical lesions, not elsewhere classified need a more specific code from this category, such as M99.00, M99.01, and M99.02.