All ICD10 Codes
M86Not billable, use a more specific code below

Osteomyelitis

In Other osteopathies (M86-M90), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue

195 billable codes under M86: all are a CC; 171 map to HCC 92 (Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Excludes1: not coded here, use a different code

Excludes2: not included here, code separately if applicable

Use additional code: add a second code for this, listed after this one

  • code (B95-B97) to identify infectious agent
  • code to identify major osseous defect, if applicable (M89.7-)

Also applies, from Other osteopathies (M86-M90)

These notes sit on M86-M90 and apply to every code under it, including M86.

Excludes1: not coded here, use a different code

  • postprocedural osteopathies (M96.-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.

Read Section I.C.13 (page 60)

All codes under M86

M86 can't be used on a claim. Pick a billable code below; grey headings group them.

M86 MS-DRGs

As the principal diagnosis, the billable codes under M86 group to these 7 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to M86

Notes on these codes point to M86.

  • M89.7 Code First: osteomyelitis (M86.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Bone Infections

Like other parts of the body, bones can get infected. The infections are usually bacterial, but can also be fungal. They may spread to the bone from nearby skin or muscles, or from another part of the body through the bloodstream. People who are at risk for bone infections include those with diabetes, poor circulation, or recent injury to the bone. You may also be at risk if you are having hemodialysis.

Read more about bone infections on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.