ICD-10-CM 2027
ICD-10 code for osteomyelitis
From the official ICD-10-CM alphabetic index entry “Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis)”. Page updated September 29, 2026.
About coding osteomyelitis
The ICD-10-CM code for osteomyelitis is M86.9 (Osteomyelitis, unspecified). The official index lists 179 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M86.9.
Within M86, choose M86.9 (unspecified) only when documentation doesn't support a more specific option: acute hematogenous osteomyelitis (M86.0), other acute osteomyelitis (M86.1), subacute osteomyelitis (M86.2), chronic multifocal osteomyelitis (M86.3), chronic osteomyelitis with draining sinus (M86.4), other chronic hematogenous osteomyelitis (M86.5), other chronic osteomyelitis (M86.6) and other osteomyelitis (M86.8).
Use an additional code (B95-B97) to identify infectious agent. Use an additional code to identify major osseous defect, if applicable (M89.7-).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific osteomyelitis codes (official index)
- acute M86.10 — Other acute osteomyelitis, unspecified site
- carpus M86.14 — Other acute osteomyelitis, hand
- clavicle M86.11 — Other acute osteomyelitis, shoulder
- femur M86.15 — Other acute osteomyelitis, femur
- fibula M86.16 — Other acute osteomyelitis, tibia and fibula
- finger M86.14 — Other acute osteomyelitis, hand
- hematogenous M86.00 — Acute hematogenous osteomyelitis, unspecified site
- carpus M86.04 — Acute hematogenous osteomyelitis, hand
- clavicle M86.01 — Acute hematogenous osteomyelitis, shoulder
- femur M86.05 — Acute hematogenous osteomyelitis, femur
- fibula M86.06 — Acute hematogenous osteomyelitis, tibia and fibula
- finger M86.04 — Acute hematogenous osteomyelitis, hand
- humerus M86.02 — Acute hematogenous osteomyelitis, humerus
- ilium M86.08 — Acute hematogenous osteomyelitis, other sites
- ischium M86.08 — Acute hematogenous osteomyelitis, other sites
- mandible M27.2 — Inflammatory conditions of jaws
- metacarpus M86.04 — Acute hematogenous osteomyelitis, hand
- metatarsus M86.07 — Acute hematogenous osteomyelitis, ankle and foot
- multiple sites M86.09 — Acute hematogenous osteomyelitis, multiple sites
- neck M86.08 — Acute hematogenous osteomyelitis, other sites
- orbit H05.02 — Osteomyelitis of orbit
- petrous bone
- radius M86.03 — Acute hematogenous osteomyelitis, radius and ulna
- rib M86.08 — Acute hematogenous osteomyelitis, other sites
- scapula M86.01 — Acute hematogenous osteomyelitis, shoulder
- skull M86.08 — Acute hematogenous osteomyelitis, other sites
- tarsus M86.07 — Acute hematogenous osteomyelitis, ankle and foot
- tibia M86.06 — Acute hematogenous osteomyelitis, tibia and fibula
- toe M86.07 — Acute hematogenous osteomyelitis, ankle and foot
- ulna M86.03 — Acute hematogenous osteomyelitis, radius and ulna
- vertebra
- humerus M86.12 — 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 M86.14 — Other acute osteomyelitis, hand
- metatarsus M86.17 — Other acute osteomyelitis, ankle and foot
- multiple sites M86.19 — Other acute osteomyelitis, multiple sites
- neck M86.18 — Other acute osteomyelitis, other site
- orbit H05.02 — Osteomyelitis of orbit
- petrous bone
- radius M86.13 — Other acute osteomyelitis, radius and ulna
- rib M86.18 — Other acute osteomyelitis, other site
- scapula M86.11 — Other acute osteomyelitis, shoulder
- skull M86.18 — Other acute osteomyelitis, other site
- tarsus M86.17 — Other acute osteomyelitis, ankle and foot
- tibia M86.16 — Other acute osteomyelitis, tibia and fibula
- toe M86.17 — Other acute osteomyelitis, ankle and foot
- ulna M86.13 — Other acute osteomyelitis, radius and ulna
- vertebra
- chronic (or old) M86.60 — Other chronic osteomyelitis, unspecified site
- with draining sinus M86.40 — Chronic osteomyelitis with draining sinus, unspecified site
- carpus M86.44 — Chronic osteomyelitis with draining sinus, hand
- clavicle M86.41 — Chronic osteomyelitis with draining sinus, shoulder
- femur M86.45 — Chronic osteomyelitis with draining sinus, femur
- fibula M86.46 — Chronic osteomyelitis with draining sinus, tibia and fibula
- finger M86.44 — Chronic osteomyelitis with draining sinus, hand
- humerus M86.42 — Chronic osteomyelitis with draining sinus, humerus
- ilium M86.48 — Chronic osteomyelitis with draining sinus, other site
- ischium M86.48 — Chronic osteomyelitis with draining sinus, other site
- mandible M27.2 — Inflammatory conditions of jaws
- metacarpus M86.44 — Chronic osteomyelitis with draining sinus, hand
- metatarsus M86.47 — Chronic osteomyelitis with draining sinus, ankle and foot
- multiple sites M86.49 — Chronic osteomyelitis with draining sinus, multiple sites
- neck M86.48 — Chronic osteomyelitis with draining sinus, other site
- pubic ramus [pubis] M86.48 — Chronic osteomyelitis with draining sinus, other site
- orbit H05.02 — Osteomyelitis of orbit
- petrous bone
- radius M86.43 — Chronic osteomyelitis with draining sinus, radius and ulna
- rib M86.48 — Chronic osteomyelitis with draining sinus, other site
- scapula M86.41 — Chronic osteomyelitis with draining sinus, shoulder
- skull M86.48 — Chronic osteomyelitis with draining sinus, other site
- tarsus M86.47 — Chronic osteomyelitis with draining sinus, ankle and foot
- tibia M86.46 — Chronic osteomyelitis with draining sinus, tibia and fibula
- toe M86.47 — Chronic osteomyelitis with draining sinus, ankle and foot
- ulna M86.43 — Chronic osteomyelitis with draining sinus, radius and ulna
- vertebra
- carpus M86.64 — Other chronic osteomyelitis, hand
- clavicle M86.61 — Other chronic osteomyelitis, shoulder
- femur M86.65 — Other chronic osteomyelitis, thigh
- fibula M86.66 — Other chronic osteomyelitis, tibia and fibula
- finger M86.64 — Other chronic osteomyelitis, hand
- hematogenous NEC M86.50 — Other chronic hematogenous osteomyelitis, unspecified site
- carpus M86.54 — Other chronic hematogenous osteomyelitis, hand
- clavicle M86.51 — Other chronic hematogenous osteomyelitis, shoulder
- femur M86.55 — Other chronic hematogenous osteomyelitis, femur
- fibula M86.56 — Other chronic hematogenous osteomyelitis, tibia and fibula
- finger M86.54 — Other chronic hematogenous osteomyelitis, hand
- humerus M86.52 — Other chronic hematogenous osteomyelitis, humerus
- ilium M86.58 — Other chronic hematogenous osteomyelitis, other site
- ischium M86.58 — Other chronic hematogenous osteomyelitis, other site
- mandible M27.2 — Inflammatory conditions of jaws
- metacarpus M86.54 — Other chronic hematogenous osteomyelitis, hand
- metatarsus M86.57 — Other chronic hematogenous osteomyelitis, ankle and foot
- multifocal M86.30 — Chronic multifocal osteomyelitis, unspecified site
- carpus M86.34 — Chronic multifocal osteomyelitis, hand
- clavicle M86.31 — Chronic multifocal osteomyelitis, shoulder
- femur M86.35 — Chronic multifocal osteomyelitis, femur
- fibula M86.36 — Chronic multifocal osteomyelitis, tibia and fibula
- finger M86.34 — Chronic multifocal osteomyelitis, hand
- humerus M86.32 — Chronic multifocal osteomyelitis, humerus
- ilium M86.38 — Chronic multifocal osteomyelitis, other site
- ischium M86.38 — Chronic multifocal osteomyelitis, other site
- metacarpus M86.34 — Chronic multifocal osteomyelitis, hand
- metatarsus M86.37 — Chronic multifocal osteomyelitis, ankle and foot
- multiple sites M86.39 — Chronic multifocal osteomyelitis, multiple sites
- neck M86.38 — Chronic multifocal osteomyelitis, other site
- pubic ramus [pubis] M86.38 — Chronic multifocal osteomyelitis, other site
- radius M86.33 — Chronic multifocal osteomyelitis, radius and ulna
- rib M86.38 — Chronic multifocal osteomyelitis, other site
- scapula M86.31 — Chronic multifocal osteomyelitis, shoulder
- skull M86.38 — Chronic multifocal osteomyelitis, other site
- tarsus M86.37 — Chronic multifocal osteomyelitis, ankle and foot
- tibia M86.36 — Chronic multifocal osteomyelitis, tibia and fibula
- toe M86.37 — Chronic multifocal osteomyelitis, ankle and foot
- ulna M86.33 — Chronic multifocal osteomyelitis, radius and ulna
- vertebra
- multiple sites M86.59 — Other chronic hematogenous osteomyelitis, multiple sites
- neck M86.58 — Other chronic hematogenous osteomyelitis, other site
- orbit H05.02 — Osteomyelitis of orbit
- petrous bone
- pubic ramus [pubis] M86.58 — Other chronic hematogenous osteomyelitis, other site
- radius M86.53 — Other chronic hematogenous osteomyelitis, radius and ulna
- rib M86.58 — Other chronic hematogenous osteomyelitis, other site
- scapula M86.51 — Other chronic hematogenous osteomyelitis, shoulder
- skull M86.58 — Other chronic hematogenous osteomyelitis, other site
- tarsus M86.57 — Other chronic hematogenous osteomyelitis, ankle and foot
- tibia M86.56 — Other chronic hematogenous osteomyelitis, tibia and fibula
- toe M86.57 — Other chronic hematogenous osteomyelitis, ankle and foot
- ulna M86.53 — Other chronic hematogenous osteomyelitis, radius and ulna
- vertebra
- humerus M86.62 — 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 M86.64 — Other chronic osteomyelitis, hand
- metatarsus M86.67 — Other chronic osteomyelitis, ankle and foot
- multifocal
- multiple sites M86.69 — Other chronic osteomyelitis, multiple sites
- neck M86.68 — Other chronic osteomyelitis, other site
- orbit H05.02 — Osteomyelitis of orbit
- petrous bone
- radius M86.63 — Other chronic osteomyelitis, radius and ulna
- rib M86.68 — Other chronic osteomyelitis, other site
- scapula M86.61 — Other chronic osteomyelitis, shoulder
- skull M86.68 — Other chronic osteomyelitis, other site
- tarsus M86.67 — Other chronic osteomyelitis, ankle and foot
- tibia M86.66 — Other chronic osteomyelitis, tibia and fibula
- toe M86.67 — Other chronic osteomyelitis, ankle and foot
- ulna M86.63 — Other chronic osteomyelitis, radius and ulna
- vertebra
- echinococcal B67.2 — Echinococcus granulosus infection of bone
- Garr's
- in diabetes mellitus
- jaw (acute) (chronic) (lower) (neonatal) (suppurative) (upper) M27.2 — Inflammatory conditions of jaws
- nonsuppurating
- orbit H05.02 — Osteomyelitis of orbit
- petrous bone
- Salmonella (arizonae) (cholerae-suis) (enteritidis) (typhimurium) A02.24 — Salmonella osteomyelitis
- sclerosing, nonsuppurative
- specified type NEC M86.8X — Other osteomyelitis
- mandible M27.2 — Inflammatory conditions of jaws
- orbit H05.02 — Osteomyelitis of orbit
- petrous bone
- vertebra
- subacute M86.20 — Subacute osteomyelitis, unspecified site
- carpus M86.24 — Subacute osteomyelitis, hand
- clavicle M86.21 — Subacute osteomyelitis, shoulder
- femur M86.25 — Subacute osteomyelitis, femur
- fibula M86.26 — Subacute osteomyelitis, tibia and fibula
- finger M86.24 — Subacute osteomyelitis, hand
- humerus M86.22 — Subacute osteomyelitis, humerus
- mandible M27.2 — Inflammatory conditions of jaws
- metacarpus M86.24 — Subacute osteomyelitis, hand
- metatarsus M86.27 — Subacute osteomyelitis, ankle and foot
- multiple sites M86.29 — Subacute osteomyelitis, multiple sites
- neck M86.28 — Subacute osteomyelitis, other site
- orbit H05.02 — Osteomyelitis of orbit
- petrous bone
- radius M86.23 — Subacute osteomyelitis, radius and ulna
- rib M86.28 — Subacute osteomyelitis, other site
- scapula M86.21 — Subacute osteomyelitis, shoulder
- skull M86.28 — Subacute osteomyelitis, other site
- tarsus M86.27 — Subacute osteomyelitis, ankle and foot
- tibia M86.26 — Subacute osteomyelitis, tibia and fibula
- toe M86.27 — Subacute osteomyelitis, ankle and foot
- ulna M86.23 — Subacute osteomyelitis, radius and ulna
- vertebra
- syphilitic A52.77 — Syphilis of bone and joint
- congenital (early) A50.02 — Early congenital syphilitic osteochondropathy
- tuberculous
- typhoid A01.05 — Typhoid osteomyelitis
- vertebra M46.20 — Osteomyelitis of vertebra, site unspecified
- 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
Common questions about osteomyelitis ICD-10 codes
What is the ICD-10 code for osteomyelitis?
- M86.9 — Osteomyelitis, unspecified. More specific codes apply when the documentation supports them: M86.10, M86.14, M86.11, M86.15 and others below.
What is the ICD-10 code for acute osteomyelitis?
- M86.10 — Other acute osteomyelitis, unspecified site.
What is the ICD-10 code for chronic osteomyelitis?
- M86.60 — Other chronic osteomyelitis, unspecified site.
What is the ICD-10 code for echinococcal osteomyelitis?
- B67.2 — Echinococcus granulosus infection of bone.
What is the ICD-10 code for jaw osteomyelitis?
- M27.2 — Inflammatory conditions of jaws.
What is the ICD-10 code for orbit osteomyelitis?
- H05.02 — Osteomyelitis of orbit (header code; choose a more specific subcode).
What is the ICD-10 code for salmonella osteomyelitis?
- A02.24 — Salmonella osteomyelitis.
Is M86.9 billable?
- Yes. M86.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M86.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M86.9 as a principal diagnosis.
Is M86.9 a CC or MCC?
- M86.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.