M86.8X21
✓ Billable
Other osteomyelitis, right upper arm
ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue
Code
M86.8X21
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Musculoskeletal System and Connective Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Also known as
- Brodie's abscess
Excludes1 — never code together
- osteomyelitis due to:
- echinococcus (B67.2)
- gonococcus (A54.43)
- salmonella (A02.24)
Excludes2 — not included here, but may code together
- ostemyelitis of:
- orbit (H05.0-)
- petrous bone (H70.2-)
- vertebra (M46.2-)
Use additional code
- code (B95-B97) to identify infectious agent
Frequently asked questions
What is ICD-10 code M86.8X21?
ICD-10-CM code M86.8X21 represents Other osteomyelitis, right upper arm. It is a billable diagnosis code in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is M86.8X21 billable?
Yes. M86.8X21 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is M86.8X21 in?
M86.8X21 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.
Related codes in the M86 category
M86
Osteomyelitis
Non-billable
M86.0
Acute hematogenous osteomyelitis
Non-billable
M86.1
Other acute osteomyelitis
Non-billable
M86.00
Acute hematogenous osteomyelitis, unspecified site
Billable
M86.01
Acute hematogenous osteomyelitis, shoulder
Non-billable
M86.02
Acute hematogenous osteomyelitis, humerus
Non-billable
M86.03
Acute hematogenous osteomyelitis, radius and ulna
Non-billable
M86.04
Acute hematogenous osteomyelitis, hand
Non-billable
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