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M86.8X21 vs M96

M86.8X21 (Other osteomyelitis, right upper arm) compared with M96 (Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1. MedCoder-derived

Relationship

Conflict

Excludes1 conflict

M86.8X21
Other osteomyelitis, right upper arm
↔
M96
Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified

Not coded here — these two are mutually exclusive.

“postprocedural osteopathies (M96.-)”

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Can these codes be reported together?

No — do not report together. M86.8X21 carries an Excludes1 note covering M96: “postprocedural osteopathies (M96.-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

M86.8X21Other osteomyelitis, right upper armM96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
Billing statusBillableNon-billable header

Report instead: M96.0, M96.1, M96.2, M96.3, M96.4

ClassificationM00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)
DefinitionOther osteomyelitis, right upper arm is a billable ICD-10-CM diagnosis code (M86.8X21).Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified is a non-billable ICD-10-CM category code (M96).
Use additional code
code (B95-B97) to identify infectious agent
code to identify major osseous defect, if applicable (M89.7-)
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources