M86.1

Other acute osteomyelitis

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M86–M90 Other osteopathies

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

Use additional code
Excludes1
Excludes2

M86.1 is a non-billable ICD-10-CM code header for other acute osteomyelitis. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M86.10 Other acute osteomyelitis, unspecified site; M86.11 Other acute osteomyelitis, shoulder; M86.12 Other acute osteomyelitis, humerus; M86.13 Other acute osteomyelitis, radius and ulna and 6 more. Its coding notes include a Use additional code instruction, 5 Excludes1 entries and 14 Excludes2 entries.

Use additional code

Add the listed code as a secondary code, if known.

Inherited from M86 Osteomyelitis

code (B95-B97) to identify infectious agent
code to identify major osseous defect, if applicable (M89.7-)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from M86 Osteomyelitis

osteomyelitis due to:
- echinococcus (B67.2)
- gonococcus (A54.43)
- salmonella (A02.24)

Also from chapter/block level (1 note)

Inherited from M86–M90 Other osteopathies

postprocedural osteopathies (M96.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from M86 Osteomyelitis

ostemyelitis of:
- orbit (H05.0-)
- petrous bone (H70.2-)
- vertebra (M46.2-)

Also from chapter/block level (10 notes)

Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue

arthropathic psoriasis (L40.5-)
certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
compartment syndrome (traumatic) (T79.A-)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Notes

Also from chapter/block level (1 note)

Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue

Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More specific codes under M86.1 10