ICD-10-CM
ICD-10 code for Osteomyelitis: M86.9
The ICD-10-CM index points "Osteomyelitis" to M86 (Osteomyelitis), a header that is not billable. When nothing more specific is documented, the billable code is M86.9, Osteomyelitis, unspecified.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- M86.10acute, Other acute osteomyelitis, unspecified siteBillable
- M86.60chronic (or old), Other chronic osteomyelitis, unspecified siteBillable
- B67.2echinococcal, Echinococcus granulosus infection of boneBillable
- M27.2jaw (acute) (chronic) (lower) (neonatal) (suppurative) (upper), Inflammatory conditions of jawsBillable
- A02.24Salmonella (arizonae) (cholerae-suis) (enteritidis) (typhimurium), Salmonella osteomyelitisBillable
- M86.20subacute, Subacute osteomyelitis, unspecified siteBillable
- A52.77syphilitic, Syphilis of bone and jointBillable
- A01.05typhoid, Typhoid osteomyelitisBillable
- M46.20vertebra, Osteomyelitis of vertebra, site unspecifiedBillable
More specific codes in M86
A header groups codes and is not billed. A billable code is one you can report.
- M86OsteomyelitisHeader
- M86.0Acute hematogenous osteomyelitisHeader
- M86.00Acute hematogenous osteomyelitis, unspecified siteBillable
- M86.01Acute hematogenous osteomyelitis, shoulderHeader
- M86.02Acute hematogenous osteomyelitis, humerusHeader
- M86.03Acute hematogenous osteomyelitis, radius and ulnaHeader
- M86.04Acute hematogenous osteomyelitis, handHeader
- M86.05Acute hematogenous osteomyelitis, femurHeader
- M86.06Acute hematogenous osteomyelitis, tibia and fibulaHeader
- M86.07Acute hematogenous osteomyelitis, ankle and footHeader
- M86.08Acute hematogenous osteomyelitis, other sitesBillable
- M86.09Acute hematogenous osteomyelitis, multiple sitesBillable
- M86.1Other acute osteomyelitisHeader
- M86.10Other acute osteomyelitis, unspecified siteBillable
- M86.11Other acute osteomyelitis, shoulderHeader
- M86.12Other acute osteomyelitis, humerusHeader
- M86.13Other acute osteomyelitis, radius and ulnaHeader
- M86.14Other acute osteomyelitis, handHeader
- M86.15Other acute osteomyelitis, femurHeader
- M86.16Other acute osteomyelitis, tibia and fibulaHeader
- M86.17Other acute osteomyelitis, ankle and footHeader
- M86.18Other acute osteomyelitis, other siteBillable
- M86.19Other acute osteomyelitis, multiple sitesBillable
- M86.2Subacute osteomyelitisHeader
- M86.20Subacute osteomyelitis, unspecified siteBillable
- M86.21Subacute osteomyelitis, shoulderHeader
- M86.22Subacute osteomyelitis, humerusHeader
- M86.23Subacute osteomyelitis, radius and ulnaHeader
- M86.24Subacute osteomyelitis, handHeader
- M86.25Subacute osteomyelitis, femurHeader
- M86.26Subacute osteomyelitis, tibia and fibulaHeader
- M86.27Subacute osteomyelitis, ankle and footHeader
- M86.28Subacute osteomyelitis, other siteBillable
- M86.29Subacute osteomyelitis, multiple sitesBillable
- M86.3Chronic multifocal osteomyelitisHeader
- M86.30Chronic multifocal osteomyelitis, unspecified siteBillable
- M86.31Chronic multifocal osteomyelitis, shoulderHeader
- M86.32Chronic multifocal osteomyelitis, humerusHeader
- M86.33Chronic multifocal osteomyelitis, radius and ulnaHeader
- M86.34Chronic multifocal osteomyelitis, handHeader
- M86.35Chronic multifocal osteomyelitis, femurHeader
- M86.36Chronic multifocal osteomyelitis, tibia and fibulaHeader
- M86.37Chronic multifocal osteomyelitis, ankle and footHeader
- M86.38Chronic multifocal osteomyelitis, other siteBillable
- M86.39Chronic multifocal osteomyelitis, multiple sitesBillable
- M86.4Chronic osteomyelitis with draining sinusHeader
- M86.40Chronic osteomyelitis with draining sinus, unspecified siteBillable
- M86.41Chronic osteomyelitis with draining sinus, shoulderHeader
- M86.42Chronic osteomyelitis with draining sinus, humerusHeader
- M86.43Chronic osteomyelitis with draining sinus, radius and ulnaHeader
- M86.44Chronic osteomyelitis with draining sinus, handHeader
- M86.45Chronic osteomyelitis with draining sinus, femurHeader
- M86.46Chronic osteomyelitis with draining sinus, tibia and fibulaHeader
- M86.47Chronic osteomyelitis with draining sinus, ankle and footHeader
- M86.48Chronic osteomyelitis with draining sinus, other siteBillable
- M86.49Chronic osteomyelitis with draining sinus, multiple sitesBillable
- M86.5Other chronic hematogenous osteomyelitisHeader
- M86.50Other chronic hematogenous osteomyelitis, unspecified siteBillable
- M86.51Other chronic hematogenous osteomyelitis, shoulderHeader
- M86.52Other chronic hematogenous osteomyelitis, humerusHeader
Use additional code
The CDC tabular list says to add the code named here after this one when it applies.
From M86. A note on a category applies to every code under it.
Use additional code (B95-B97) to identify infectious agent
Use additional code to identify major osseous defect, if applicable (M89.7-)
Excludes1
Excludes1 means these codes are not reported together.
From M86. A note on a category applies to every code under it.
- osteomyelitis due to:
- B67.2Echinococcus
- A54.43Gonococcus
- A02.24Salmonella
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From M86. A note on a category applies to every code under it.
- ostemyelitis of:
- H05.0-Orbit
- H70.2-Petrous bone
- M46.2-Vertebra
Related conditions
Related pages
- M86.9 code detailsNotes, nearby codes, CMS-HCC group
- Category M86Every code under it
- Chapter 13Diseases of the musculoskeletal system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Osteomyelitis?
The ICD-10-CM index points "Osteomyelitis" to M86 (Osteomyelitis), a header that is not billable. When nothing more specific is documented, the billable code is M86.9, Osteomyelitis, unspecified.
Is M86.9 billable?
Yes. M86.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to M86.9?
The CDC tabular list gives 4 Excludes1 notes (not coded together), 4 Excludes2 notes (may be coded together when both are documented), 2 "use additional code" notes for M86.9 and the categories above it. They are listed on this page.
What chapter is M86.9 in?
Chapter 13. Diseases of the musculoskeletal system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.