FY2027 ICD-10-CM reference
M86: Osteomyelitis
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Osteomyelitis. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
More specific FY2027 codes
- M86.0: Acute hematogenous osteomyelitisNonbillable heading
- M86.1: Other acute osteomyelitisNonbillable heading
- M86.2: Subacute osteomyelitisNonbillable heading
- M86.3: Chronic multifocal osteomyelitisNonbillable heading
- M86.4: Chronic osteomyelitis with draining sinusNonbillable heading
- M86.5: Other chronic hematogenous osteomyelitisNonbillable heading
- M86.6: Other chronic osteomyelitisNonbillable heading
- M86.8: Other osteomyelitisNonbillable heading
- M86.9: Osteomyelitis, unspecifiedBillable code
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Source: M00-M99 (chapter, inherited).
Excludes2
arthropathic psoriasis (L40.5-)
Source: M00-M99 (chapter, inherited).
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: M00-M99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: M00-M99 (chapter, inherited).
Excludes2
compartment syndrome (traumatic) (T79.A-)
Source: M00-M99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: M00-M99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: M00-M99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: M00-M99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: M00-M99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: M00-M99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: M00-M99 (chapter, inherited).
Excludes1
postprocedural osteopathies (M96.-)
Source: M86-M90 (section, inherited).
Instructional note
code (B95-B97) to identify infectious agent
Source: M86 (category, direct).
Instructional note
code to identify major osseous defect, if applicable (M89.7-)
Source: M86 (category, direct).
Excludes1
osteomyelitis due to:
Source: M86 (category, direct).
Excludes1
echinococcus (B67.2)
Source: M86 (category, direct).
Excludes1
gonococcus (A54.43)
Source: M86 (category, direct).
Excludes1
salmonella (A02.24)
Source: M86 (category, direct).
Excludes2
ostemyelitis of:
Source: M86 (category, direct).
Excludes2
orbit (H05.0-)
Source: M86 (category, direct).
Excludes2
petrous bone (H70.2-)
Source: M86 (category, direct).
Excludes2
vertebra (M46.2-)
Source: M86 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does M86 mean in FY2027?
The official ICD-10-CM descriptor is Osteomyelitis. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is M86 billable in FY2027?
The FY2027 order file marks M86 as a nonbillable heading. Select a complete billable child code.
Does M86 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition