`M86.10` Other acute osteomyelitis, unspecified site

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from M86 Osteomyelitis

Excludes1 (never code together)

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

Excludes2 (not included here)

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

Use additional code

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

Risk adjustment (HCC)

CMS-HCC V28: HCC 92 — Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
CMS-HCC V22: HCC 39 — Bone/Joint/Muscle Infections/Necrosis
ESRD V24: HCC 39

MS-DRG index

Defines the logic of DRG(s) 456-458 in MDC 08.

Approximate ICD-9-CM (GEMs)

730.00 Acute osteomyelitis, site unspecified (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to M86.10

Back-references to M86

Code First: M89.7 Major osseous defect ("osteomyelitis (M86.-)")

Diagnosis Index entries for M86.10

Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis) › acute

Nearby codes

M86.072 Acute hematogenous osteomyelitis, left ankle and foot
M86.079 Acute hematogenous osteomyelitis, unspecified ankle and foot
M86.08 Acute hematogenous osteomyelitis, other sites
M86.09 Acute hematogenous osteomyelitis, multiple sites
M86.1 Other acute osteomyelitis
M86.10 Other acute osteomyelitis, unspecified site (this code)
M86.11 Other acute osteomyelitis, shoulder
M86.111 Other acute osteomyelitis, right shoulder
M86.112 Other acute osteomyelitis, left shoulder
M86.119 Other acute osteomyelitis, unspecified shoulder
M86.12 Other acute osteomyelitis, humerus