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M86.9 — Osteomyelitis, unspecified
M86.9
What this code means
Osteomyelitis is infection of a bone, causing pain, fever and swelling; site and course not specified here.
Also called: osteomyelitis, bone infection.
When this code is used
Used for osteomyelitis, unspecified.
Where it sits in ICD-10-CM
Code M86.9 belongs to Chapter 13: Diseases of the musculoskeletal system and connective tissue, which covers codes M00–M99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Watch: related videos
Frequently asked questions
What is ICD-10-CM code M86.9?
M86.9 is the ICD-10-CM diagnosis code for “Osteomyelitis, unspecified”. Osteomyelitis is infection of a bone, causing pain, fever and swelling; site and course not specified here.
When is code M86.9 used?
Used for osteomyelitis, unspecified. It belongs to Chapter 13 of ICD-10-CM (Diseases of the musculoskeletal system and connective tissue).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.