ICD-10 Diagnosis Code M86.9

Osteomyelitis, unspecified

Diagnosis Code M86.9

ICD-10: M86.9
Short Description: Osteomyelitis, unspecified
Long Description: Osteomyelitis, unspecified
This is the 2019 version of the ICD-10-CM diagnosis code M86.9

Valid for Submission
The code M86.9 is valid for submission for HIPAA-covered transactions.

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

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code M86.9 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)


Convert 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)

  • Abscess of bone, except accessory sinus, jaw AND/OR mastoid
  • Bacterial osteomyelitis
  • Bone abscess
  • Bone inflammatory disease
  • 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 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 forearm
  • Osteomyelitis of forefoot
  • Osteomyelitis of frontal bone
  • Osteomyelitis of hand
  • Osteomyelitis of hindfoot
  • Osteomyelitis of left foot
  • Osteomyelitis of lower leg
  • Osteomyelitis of midfoot
  • Osteomyelitis of multiple sites
  • Osteomyelitis of pelvic region
  • Osteomyelitis of right foot
  • 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 ankle AND/OR foot
  • 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

Index of Diseases and Injuries
References found for the code M86.9 in the Index of Diseases and Injuries:

  • Inclusion Terms:
    • Infection of bone NOS
    • Periostitis WITH out osteomyelitis

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.

  • Bone lesion biopsy (Medical Encyclopedia)
  • Bone pain or tenderness (Medical Encyclopedia)
  • Disseminated tuberculosis (Medical Encyclopedia)
  • Osteomyelitis (Medical Encyclopedia)
  • Osteomyelitis - children (Medical Encyclopedia)
  • Osteomyelitis - discharge (Medical Encyclopedia)

[Read More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Index of Diseases and Injuries Definitions

  • And - The word "and" should be interpreted to mean either "and" or "or" when it appears in a title.
  • Code also note - A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
  • Code first - Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
  • Type 1 Excludes Notes - A type 1 Excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • Type 2 Excludes Notes - A type 2 Excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
  • Includes Notes - This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
  • Inclusion terms - List of terms is included under some codes. 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.
  • NEC "Not elsewhere classifiable" - This abbreviation in the Alphabetic Index represents "other specified". When a specific code is not available for a condition, the Alphabetic Index directs the coder to the "other specified” code in the Tabular List.
  • NOS "Not otherwise specified" - This abbreviation is the equivalent of unspecified.
  • See - The "see" instruction following a main term in the Alphabetic Index indicates that another term should be referenced. It is necessary to go to the main term referenced with the "see" note to locate the correct code.
  • See Also - A "see also" instruction following a main term in the Alphabetic Index instructs that there is another main term that may also be referenced that may provide additional Alphabetic Index entries that may be useful. It is not necessary to follow the "see also" note when the original main term provides the necessary code.
  • 7th Characters - Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
  • With - The word "with" should be interpreted to mean "associated with" or "due to" when it appears in a code title, the Alphabetic Index, or an instructional note in the Tabular List. The word "with" in the Alphabetic Index is sequenced immediately following the main term, not in alphabetical order.

Present on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

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