ICD-10 Code for Osteomyelitis
Also indexed as (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis)
The ICD-10-CM code for osteomyelitis is M86.9 — Osteomyelitis, unspecified. This is the code the Alphabetic Index gives for osteomyelitis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
BillableUnspecified
M86.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which osteomyelitis code should you use?
The Alphabetic Index lists 90 codes under Osteomyelitis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| acute | M86.10 | Other acute osteomyelitis, unspecified site |
| chronic | M86.60 | Other chronic osteomyelitis, unspecified site |
| echinococcal | B67.2 | Echinococcus granulosus infection of bone |
| jaw | M27.2 | Inflammatory conditions of jaws |
| orbit | H05.02Not billable | Osteomyelitis of orbit |
| Salmonella | A02.24 | Salmonella osteomyelitis |
| specified type NEC | M86.8XNot billable | Other osteomyelitis |
| subacute | M86.20 | Subacute osteomyelitis, unspecified site |
| syphilitic | A52.77 | Syphilis of bone and joint |
| typhoid | A01.05 | Typhoid osteomyelitis |
| vertebra | M46.20 | Osteomyelitis of vertebra, site unspecified |
Osteomyelitis acute
| carpus | M86.14Not billable | Other acute osteomyelitis, hand |
| clavicle | M86.11Not billable | Other acute osteomyelitis, shoulder |
| femur | M86.15Not billable | Other acute osteomyelitis, femur |
| fibula | M86.16Not billable | Other acute osteomyelitis, tibia and fibula |
| finger | M86.14Not billable | Other acute osteomyelitis, hand |
| hematogenous | M86.00 | Acute hematogenous osteomyelitis, unspecified site |
| humerus | M86.12Not billable | Other acute osteomyelitis, humerus |
| ilium | M86.18 | Other acute osteomyelitis, other site |
| ischium | M86.18 | Other acute osteomyelitis, other site |
| mandible | M27.2 | Inflammatory conditions of jaws |
| metacarpus | M86.14Not billable | Other acute osteomyelitis, hand |
| metatarsus | M86.17Not billable | Other acute osteomyelitis, ankle and foot |
| multiple sites | M86.19 | Other acute osteomyelitis, multiple sites |
| neck | M86.18 | Other acute osteomyelitis, other site |
| orbit | H05.02Not billable | Osteomyelitis of orbit |
| radius | M86.13Not billable | Other acute osteomyelitis, radius and ulna |
| rib | M86.18 | Other acute osteomyelitis, other site |
| scapula | M86.11Not billable | Other acute osteomyelitis, shoulder |
| skull | M86.18 | Other acute osteomyelitis, other site |
| tarsus | M86.17Not billable | Other acute osteomyelitis, ankle and foot |
| tibia | M86.16Not billable | Other acute osteomyelitis, tibia and fibula |
| toe | M86.17Not billable | Other acute osteomyelitis, ankle and foot |
| ulna | M86.13Not billable | Other acute osteomyelitis, radius and ulna |
| hematogenous › carpus | M86.04Not billable | Acute hematogenous osteomyelitis, hand |
| hematogenous › clavicle | M86.01Not billable | Acute hematogenous osteomyelitis, shoulder |
| hematogenous › femur | M86.05Not billable | Acute hematogenous osteomyelitis, femur |
| hematogenous › fibula | M86.06Not billable | Acute hematogenous osteomyelitis, tibia and fibula |
| hematogenous › finger | M86.04Not billable | Acute hematogenous osteomyelitis, hand |
| hematogenous › humerus | M86.02Not billable | Acute hematogenous osteomyelitis, humerus |
| hematogenous › ilium | M86.08 | Acute hematogenous osteomyelitis, other sites |
| hematogenous › ischium | M86.08 | Acute hematogenous osteomyelitis, other sites |
| hematogenous › mandible | M27.2 | Inflammatory conditions of jaws |
| hematogenous › metacarpus | M86.04Not billable | Acute hematogenous osteomyelitis, hand |
| hematogenous › metatarsus | M86.07Not billable | Acute hematogenous osteomyelitis, ankle and foot |
| hematogenous › multiple sites | M86.09 | Acute hematogenous osteomyelitis, multiple sites |
| hematogenous › neck | M86.08 | Acute hematogenous osteomyelitis, other sites |
| hematogenous › orbit | H05.02Not billable | Osteomyelitis of orbit |
| hematogenous › radius | M86.03Not billable | Acute hematogenous osteomyelitis, radius and ulna |
| hematogenous › rib | M86.08 | Acute hematogenous osteomyelitis, other sites |
| hematogenous › scapula | M86.01Not billable | Acute hematogenous osteomyelitis, shoulder |
| hematogenous › skull | M86.08 | Acute hematogenous osteomyelitis, other sites |
| hematogenous › tarsus | M86.07Not billable | Acute hematogenous osteomyelitis, ankle and foot |
| hematogenous › tibia | M86.06Not billable | Acute hematogenous osteomyelitis, tibia and fibula |
| hematogenous › toe | M86.07Not billable | Acute hematogenous osteomyelitis, ankle and foot |
| hematogenous › ulna | M86.03Not billable | Acute hematogenous osteomyelitis, radius and ulna |
Osteomyelitis chronic
| with draining sinus | M86.40 | Chronic osteomyelitis with draining sinus, unspecified site |
| carpus | M86.64Not billable | Other chronic osteomyelitis, hand |
| clavicle | M86.61Not billable | Other chronic osteomyelitis, shoulder |
| femur | M86.65Not billable | Other chronic osteomyelitis, thigh |
| fibula | M86.66Not billable | Other chronic osteomyelitis, tibia and fibula |
| finger | M86.64Not billable | Other chronic osteomyelitis, hand |
| hematogenous NEC | M86.50 | Other chronic hematogenous osteomyelitis, unspecified site |
| humerus | M86.62Not billable | Other chronic osteomyelitis, humerus |
| ilium | M86.659 | Other chronic osteomyelitis, unspecified thigh |
| ischium | M86.659 | Other chronic osteomyelitis, unspecified thigh |
| mandible | M27.2 | Inflammatory conditions of jaws |
| metacarpus | M86.64Not billable | Other chronic osteomyelitis, hand |
| metatarsus | M86.67Not billable | Other chronic osteomyelitis, ankle and foot |
| multiple sites | M86.69 | Other chronic osteomyelitis, multiple sites |
| neck | M86.68 | Other chronic osteomyelitis, other site |
| orbit | H05.02Not billable | Osteomyelitis of orbit |
| radius | M86.63Not billable | Other chronic osteomyelitis, radius and ulna |
| rib | M86.68 | Other chronic osteomyelitis, other site |
| scapula | M86.61Not billable | Other chronic osteomyelitis, shoulder |
| skull | M86.68 | Other chronic osteomyelitis, other site |
| tarsus | M86.67Not billable | Other chronic osteomyelitis, ankle and foot |
| tibia | M86.66Not billable | Other chronic osteomyelitis, tibia and fibula |
| toe | M86.67Not billable | Other chronic osteomyelitis, ankle and foot |
| ulna | M86.63Not billable | Other chronic osteomyelitis, radius and ulna |
| with draining sinus › carpus | M86.44Not billable | Chronic osteomyelitis with draining sinus, hand |
| with draining sinus › clavicle | M86.41Not billable | Chronic osteomyelitis with draining sinus, shoulder |
| with draining sinus › femur | M86.45Not billable | Chronic osteomyelitis with draining sinus, femur |
| with draining sinus › fibula | M86.46Not billable | Chronic osteomyelitis with draining sinus, tibia and fibula |
| with draining sinus › finger | M86.44Not billable | Chronic osteomyelitis with draining sinus, hand |
| with draining sinus › humerus | M86.42Not billable | Chronic osteomyelitis with draining sinus, humerus |
| with draining sinus › ilium | M86.48 | Chronic osteomyelitis with draining sinus, other site |
| with draining sinus › ischium | M86.48 | Chronic osteomyelitis with draining sinus, other site |
| with draining sinus › mandible | M27.2 | Inflammatory conditions of jaws |
Osteomyelitis specified type NEC
Osteomyelitis subacute
| carpus | M86.24Not billable | Subacute osteomyelitis, hand |
| clavicle | M86.21Not billable | Subacute osteomyelitis, shoulder |
| femur | M86.25Not billable | Subacute osteomyelitis, femur |
| fibula | M86.26Not billable | Subacute osteomyelitis, tibia and fibula |
| finger | M86.24Not billable | Subacute osteomyelitis, hand |
| humerus | M86.22Not billable | Subacute osteomyelitis, humerus |
| mandible | M27.2 | Inflammatory conditions of jaws |
| metacarpus | M86.24Not billable | Subacute osteomyelitis, hand |
| metatarsus | M86.27Not billable | Subacute osteomyelitis, ankle and foot |
| multiple sites | M86.29 | Subacute osteomyelitis, multiple sites |
| neck | M86.28 | Subacute osteomyelitis, other site |
| orbit | H05.02Not billable | Osteomyelitis of orbit |
| radius | M86.23Not billable | Subacute osteomyelitis, radius and ulna |
| rib | M86.28 | Subacute osteomyelitis, other site |
| scapula | M86.21Not billable | Subacute osteomyelitis, shoulder |
| skull | M86.28 | Subacute osteomyelitis, other site |
| tarsus | M86.27Not billable | Subacute osteomyelitis, ankle and foot |
| tibia | M86.26Not billable | Subacute osteomyelitis, tibia and fibula |
| toe | M86.27Not billable | Subacute osteomyelitis, ankle and foot |
| ulna | M86.23Not billable | Subacute osteomyelitis, radius and ulna |
Osteomyelitis syphilitic
| congenital | A50.02 | Early congenital syphilitic osteochondropathy |
Osteomyelitis vertebra
| cervical region | M46.22 | Osteomyelitis of vertebra, cervical region |
| cervicothoracic region | M46.23 | Osteomyelitis of vertebra, cervicothoracic region |
| lumbar region | M46.26 | Osteomyelitis of vertebra, lumbar region |
| lumbosacral region | M46.27 | Osteomyelitis of vertebra, lumbosacral region |
| occipito-atlanto-axial region | M46.21 | Osteomyelitis of vertebra, occipito-atlanto-axial region |
| sacrococcygeal region | M46.28 | Osteomyelitis of vertebra, sacral and sacrococcygeal region |
| thoracic region | M46.24 | Osteomyelitis of vertebra, thoracic region |
| thoracolumbar region | M46.25 | Osteomyelitis of vertebra, thoracolumbar region |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources