ICD-10-CM Code M86.9

Osteomyelitis, unspecified

Version 2020 Billable Code

Valid for Submission

M86.9 is a billable code used to specify a medical diagnosis of osteomyelitis, unspecified. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code M86.9 might also be used to specify conditions or terms like bacterial osteomyelitis, bone abscess, infection by pasteurella multocida, infection of bone, infection of bone of ankle and/or foot, infection of bone of hand, etc

Short Description:Osteomyelitis, unspecified
Long Description:Osteomyelitis, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code M86.9:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Infection of bone NOS
  • Periostitis without osteomyelitis

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code M86.9 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Bacterial osteomyelitis
  • Bone abscess
  • Infection by Pasteurella multocida
  • Infection of bone
  • Infection of bone of ankle and/or foot
  • Infection of bone of hand
  • Infection of bone of pelvic region and/or femur
  • Infection of bone of radius and/or ulna
  • Infection of bone of tibia and/or fibula
  • Infection of calcaneum
  • Infection of carpal bone
  • Infection of femur
  • Infection of femur
  • Infection of femur
  • Infection of fibula
  • Infection of humerus
  • Infection of metacarpal
  • Infection of metatarsal
  • Infection of multiple bones
  • Infection of patella
  • Infection of pelvis
  • Infection of phalanx of finger or thumb
  • Infection of phalanx of toe
  • Infection of radius
  • Infection of scapula
  • Infection of talus
  • Infection of tibia
  • Infection of ulna
  • Osteitis
  • Osteitis of hand
  • Osteitis of lower leg
  • Osteitis of shoulder region
  • Osteomyelitis
  • Osteomyelitis due to Staphylococcus aureus
  • Osteomyelitis due to type 1 diabetes mellitus
  • Osteomyelitis of ankle
  • Osteomyelitis of clavicle
  • Osteomyelitis of cranium
  • Osteomyelitis of facial bone
  • Osteomyelitis of femur
  • Osteomyelitis of femur
  • Osteomyelitis of forearm
  • Osteomyelitis of forefoot
  • Osteomyelitis of frontal bone
  • Osteomyelitis of hand
  • Osteomyelitis of hindfoot
  • Osteomyelitis of left ankle
  • Osteomyelitis of left femur
  • Osteomyelitis of left foot
  • Osteomyelitis of left hand
  • Osteomyelitis of left shoulder
  • Osteomyelitis of left tibia
  • Osteomyelitis of lower leg
  • Osteomyelitis of midfoot
  • Osteomyelitis of multiple sites
  • Osteomyelitis of pelvic region
  • Osteomyelitis of right ankle
  • Osteomyelitis of right femur
  • Osteomyelitis of right foot
  • Osteomyelitis of right hand
  • Osteomyelitis of right shoulder
  • Osteomyelitis of right tibia
  • Osteomyelitis of shoulder region
  • Osteomyelitis of shoulder region
  • Osteomyelitis of shoulder region
  • Osteomyelitis of sphenoid bone
  • Osteomyelitis of temporal bone
  • Osteomyelitis of tibia
  • Osteomyelitis of upper arm
  • Osteomyelitis of upper limb
  • Osteomyelitis of zygomatic bone
  • Pasteurella multocida osteomyelitis
  • Pedal osteitis
  • Periostitis
  • Periostitis of forearm
  • Periostitis of hand
  • Periostitis without osteomyelitis
  • Periostitis without osteomyelitis, of the forearm
  • Periostitis without osteomyelitis, of the hand
  • Periostitis without osteomyelitis-cervical spine
  • Periostitis without osteomyelitis-coccyx
  • Periostitis without osteomyelitis-lumbar spine
  • Periostitis without osteomyelitis-sacrum
  • Periostitis without osteomyelitis-thoracic spine
  • SAPHO syndrome
  • Tendoperiostitis

Clinical Information

  • OSTEOMYELITIS-. inflammation of the bone as a result of infection. it may be caused by a variety of infectious agents especially pyogenic pus producing bacteria.

Diagnostic Related Groups

The ICD-10 code M86.9 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.


Convert M86.9 to ICD-9

  • 730.20 - Osteomyelitis NOS-unspec (Approximate Flag)
  • 730.30 - Periostitis-unspec (Approximate Flag)
  • 730.90 - Bone infec NOS-unsp site (Approximate Flag)
  • 730.98 - Bone infect NOS-oth site (Approximate Flag)

Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Other osteopathies (M86-M90)
      • Osteomyelitis (M86)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

Bone Infections

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.

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