2022 ICD-10-CM Diagnosis Code M86.9

Osteomyelitis, unspecified

    2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
  • M86.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2022 edition of ICD-10-CM M86.9 became effective on October 1, 2021.
  • This is the American ICD-10-CM version of M86.9 - other international versions of ICD-10 M86.9 may differ.
Applicable To
  • Infection of bone NOS
  • Periostitis without osteomyelitis
The following code(s) above M86.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to M86.9:
  • M00-M99
    2022 ICD-10-CM Range M00-M99

    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
    Type 2 Excludes
    • 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)
    Diseases of the musculoskeletal system and connective tissue
  • M86-M90
    2022 ICD-10-CM Range M86-M90

    Other osteopathies

    Type 1 Excludes
    • postprocedural osteopathies (M96.-)
    Other osteopathies
  • M86
    ICD-10-CM Diagnosis Code M86


      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Type 2 Excludes
    Use Additional
    • code (B95-B97) to identify infectious agent
Approximate Synonyms
  • Aseptic necrosis with osteomyelitis
  • Avascular necrosis of bone as late effect of osteomyelitis
  • Bone infection of ankle
  • Bone infection of femur
  • Bone infection of foot
  • Bone infection of pelvis
  • Diabetes, type 1 with osteomyelitis
  • Diabetes, type 2 with osteomyelitis
  • Infection bone hand
  • Infection bone in multiple sites
  • Infection bone shoulder region
  • Infection bone upper arm
  • Infection of bone
  • Infection of bone of ankle
  • Infection of bone of finger
  • Infection of bone of foot
  • Infection of bone of forearm
  • Infection of bone of hand
  • Infection of bone of lower leg
  • Infection of bone of multiple sites
  • Infection of bone of shoulder girdle
  • Infection of bone of the forearm
  • Infection of bone of the lower leg
  • Infection of bone of upper arm
  • Infection of femur
  • Infection of pelvis
  • Infection of phalanx of finger or thumb
  • Osteitis of bilateral femurs
  • Osteitis of bilateral humeri
  • Osteitis of bilateral pelvis
  • Osteitis of bilateral pelvises
  • Osteitis of left femur
  • Osteitis of left humerus
  • Osteitis of left pelvis
  • Osteitis of multiple sites
  • Osteitis of pelvic region
  • Osteitis of right femur
  • Osteitis of right humerus
  • Osteitis of right pelvis
  • Osteitis of thigh
  • Osteitis of upper arm
  • Osteomyelitis
  • Osteomyelitis (bone infection)
  • Osteomyelitis due to staphylococcus aureus
  • Osteomyelitis due to type 1 diabetes mellitus
  • Osteomyelitis due to type 2 diabetes mellitus
  • Osteomyelitis of bilateral ankles
  • Osteomyelitis of bilateral feet
  • Osteomyelitis of bilateral femurs
  • Osteomyelitis of bilateral fibulas
  • Osteomyelitis of bilateral fingers
  • Osteomyelitis of bilateral hands
  • Osteomyelitis of bilateral humeri
  • Osteomyelitis of bilateral pelvis
  • Osteomyelitis of bilateral pelvises
  • Osteomyelitis of bilateral shoulders
  • Osteomyelitis of bilateral sphenoid bones
  • Osteomyelitis of bilateral temporal bones
  • Osteomyelitis of bilateral tibias
  • Osteomyelitis of bilateral zygomatic bones
  • Osteomyelitis of cranium
  • Osteomyelitis of facial bone
  • Osteomyelitis of femur
  • Osteomyelitis of finger of left hand
  • Osteomyelitis of finger of right hand
  • Osteomyelitis of forearm
  • Osteomyelitis of frontal bone
  • Osteomyelitis of hand
  • Osteomyelitis of left ankle
  • Osteomyelitis of left femur
  • Osteomyelitis of left fibula
  • Osteomyelitis of left finger
  • Osteomyelitis of left foot
  • Osteomyelitis of left hand
  • Osteomyelitis of left humerus
  • Osteomyelitis of left pelvis
  • Osteomyelitis of left shoulder
  • Osteomyelitis of left sphenoid bone
  • Osteomyelitis of left temporal bone
  • Osteomyelitis of left tibia
  • Osteomyelitis of left ulna
  • Osteomyelitis of left zygomatic bone
  • Osteomyelitis of lower leg
  • Osteomyelitis of mediastinum
  • Osteomyelitis of multiple sites
  • Osteomyelitis of nasal orbit complex
  • Osteomyelitis of pelvic region
  • Osteomyelitis of right ankle
  • Osteomyelitis of right femur
  • Osteomyelitis of right fibula
  • Osteomyelitis of right finger
  • Osteomyelitis of right foot
  • Osteomyelitis of right hand
  • Osteomyelitis of right humerus
  • Osteomyelitis of right pelvis
  • Osteomyelitis of right shoulder
  • Osteomyelitis of right sphenoid bone
  • Osteomyelitis of right temporal bone
  • Osteomyelitis of right tibia
  • Osteomyelitis of right ulna
  • Osteomyelitis of right zygomatic bone
  • Osteomyelitis of shoulder region
  • Osteomyelitis of sphenoid bone
  • Osteomyelitis of temporal bone
  • Osteomyelitis of thigh
  • Osteomyelitis of upper arm
  • Osteomyelitis of zygomatic bone
  • Osteomyelitis with avascular necrosis of bone
  • Osteomyelitis, multiple sites
  • Osteomyelitis, nasal orbit complex
  • Osteomyelitis, temporal bone
  • Periostitis
  • Periostitis of bilateral ankles
  • Periostitis of bilateral feet
  • Periostitis of bilateral femurs
  • Periostitis of bilateral forearms
  • Periostitis of bilateral hands
  • Periostitis of bilateral lower legs
  • Periostitis of bilateral pelvis
  • Periostitis of bilateral pelvises
  • Periostitis of bilateral shoulders
  • Periostitis of bilateral upper arms
  • Periostitis of forearm
  • Periostitis of hand
  • Periostitis of left ankle
  • Periostitis of left femur
  • Periostitis of left foot
  • Periostitis of left forearm
  • Periostitis of left hand
  • Periostitis of left lower leg
  • Periostitis of left pelvis
  • Periostitis of left shoulder
  • Periostitis of left upper arm
  • Periostitis of lower leg
  • Periostitis of multiple sites
  • Periostitis of pelvic region
  • Periostitis of right ankle
  • Periostitis of right femur
  • Periostitis of right foot
  • Periostitis of right forearm
  • Periostitis of right hand
  • Periostitis of right lower leg
  • Periostitis of right pelvis
  • Periostitis of right shoulder
  • Periostitis of right upper arm
  • Periostitis of shoulder region
  • Periostitis of thigh
  • Periostitis of upper arm
  • Staph aureus osteomyelitis
Clinical Information
  • A disorder characterized by an infectious process involving the bones.
  • An acute or chronic infectious process affecting the bones.
  • An acute or chronic inflammation of the bone and its structures due to infection with pyogenic bacteria.
  • Inflammation of the bone caused by an infection, which may spread to the bone marrow and tissues near the bone. Osteomyelitis can cause severe pain in the infected bone. If it is not treated, it can kill bone tissue.
  • Inflammation of the bone marrow and adjacent bone caused by a pyogenic organism; it may remain localized or may spread through the bone to involve the marrow, cortex, cancellous tissue, and periosteum.
  • Like other parts of the body, bones can get infected. The infections are usually bacterial, but can also be fungal. They may spread to the bone from nearby skin or muscles, or from another part of the body through the bloodstream. People who are at risk for bone infections include those with diabetes, poor circulation, or recent injury to the bone. You may also be at risk if you are having hemodialysis. Symptoms of bone infections include
    • pain in the infected area
    • chills and fever
    • swelling, warmth, and redness
    a blood test or imaging test such as an x-ray can tell if you have a bone infection. Treatment includes antibiotics and often surgery.
ICD-10-CM M86.9 is grouped within Diagnostic Related Group(s) (MS-DRG v39.0):
  • 539 Osteomyelitis with mcc
  • 540 Osteomyelitis with cc
  • 541 Osteomyelitis without cc/mcc

Convert M86.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change

Diagnosis Index entries containing back-references to M86.9:
  • Osteomyelitis (general) (infective) (localized) (neonatal) (purulent) (septic) (staphylococcal) (streptococcal) (suppurative) (with periostitis) M86.9

ICD-10-CM Codes Adjacent To M86.9
M86.8X0 …… multiple sites
M86.8X1 …… shoulder
M86.8X2 …… upper arm
M86.8X3 …… forearm
M86.8X4 …… hand
M86.8X5 …… thigh
M86.8X6 …… lower leg
M86.8X7 …… ankle and foot
M86.8X8 …… other site
M86.8X9 …… unspecified sites
M86.9 Osteomyelitis, unspecified
M87 Osteonecrosis
M87.0 Idiopathic aseptic necrosis of bone
M87.00 Idiopathic aseptic necrosis of unspecified bone
M87.01 Idiopathic aseptic necrosis of shoulder
M87.011 Idiopathic aseptic necrosis of right shoulder
M87.012 Idiopathic aseptic necrosis of left shoulder
M87.019 Idiopathic aseptic necrosis of unspecified shoulder
M87.02 Idiopathic aseptic necrosis of humerus
M87.021 Idiopathic aseptic necrosis of right humerus
M87.022 Idiopathic aseptic necrosis of left humerus

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.