M86.9
Billable codeOsteomyelitis, unspecified
The ICD-10 code for osteomyelitis, unspecified is M86.9.
Clinical notes
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Infection of bone NOS
- Periostitis without osteomyelitis
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- M86.0Acute hematogenous osteomyelitisnon-billable header
- M86.1Other acute osteomyelitisnon-billable header
- M86.2Subacute osteomyelitisnon-billable header
- M86.3Chronic multifocal osteomyelitisnon-billable header
- M86.4Chronic osteomyelitis with draining sinusnon-billable header
- M86.5Other chronic hematogenous osteomyelitisnon-billable header
- M86.6Other chronic osteomyelitisnon-billable header
- M86.8Other osteomyelitisnon-billable header
- M86.9Osteomyelitis, unspecified
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 73020Approximate match
- 73030Approximate match
- 73090Approximate match
- 73098Approximate match
- 73021Approximate match
- 73022Approximate match
- 73023Approximate match
- 73024Approximate match
- 73025Approximate match
- 73026Approximate match
- 73027Approximate match
- 73029Approximate match
- 73031Approximate match
- 73032Approximate match
- 73033Approximate match
- 73034Approximate match
- 73035Approximate match
- 73036Approximate match
- 73037Approximate match
- 73038Approximate match
- 73039Approximate match
- 73091Approximate match
- 73092Approximate match
- 73093Approximate match
- 73094Approximate match
- 73095Approximate match
- 73096Approximate match
- 73097Approximate match
- 73099Approximate match
Associated MS-DRGs
M86.9 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.
- DRG 456Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, Infection or Extensive Fusions with MCC
- DRG 457Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, Infection or Extensive Fusions with CC
- DRG 458Spinal Fusion Except Cervical with Spinal Curvature, Malignancy, Infection or Extensive Fusions without CC/MCC
- DRG 539Osteomyelitis with MCC
- DRG 540Osteomyelitis with CC
- DRG 541Osteomyelitis without CC/MCC