H05.0 vs M86

H05.0 (Acute inflammation of orbit) compared with M86 (Osteomyelitis), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. M86 carries an Excludes2 note covering H05.0: “orbit (H05.0-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

	H05.0Acute inflammation of orbit	M86Osteomyelitis
Billing status	Non-billable header Report instead: H05.00, H05.011, H05.012, H05.013, H05.019	Non-billable header Report instead: M86.00, M86.011, M86.012, M86.019, M86.021
Classification	H00-H59 — Diseases of the Eye and Adnexa (H00-H59)	M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)
Definition	Acute inflammation of orbit is a non-billable ICD-10-CM category code (H05.0).	Osteomyelitis is a non-billable ICD-10-CM category code (M86).
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