2027 ICD-10-CM Diagnosis Code M86Osteomyelitis

ICD-10-CM Codes›M00–M99›M86-M90›M86

ICD-10-CM M86
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M86 is a non-billable ICD-10-CM category code for osteomyelitis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M86.00, M86.011, M86.012, and M86.019.

Code Identity

ICD-10-CM Code
M86
Billable Status
No — Non-Billable Category
Code Describes
Osteomyelitis
Short Description
Osteomyelitis
Same as the full description in the CMS dataset.
Chapter
M86-M90
Other osteopathies

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM86-M90Other osteopathies
CategoryM86Osteomyelitis
This CodeM86Osteomyelitis

Specific Coding for OsteomyelitisOverview

Non-specific codes like M86 require more characters. Use one of these billable codes instead:

  • M86.0 for Acute hematogenous osteomyelitis

  • Use M86.00 for Acute hematogenous osteomyelitis, unspecified site

  • M86.01 for Acute hematogenous osteomyelitis, shoulder

  • M86.02 for Acute hematogenous osteomyelitis, humerus

  • M86.03 for Acute hematogenous osteomyelitis, radius and ulna

  • M86.04 for Acute hematogenous osteomyelitis, hand

  • M86.05 for Acute hematogenous osteomyelitis, femur

  • M86.06 for Acute hematogenous osteomyelitis, tibia and fibula

  • M86.07 for Acute hematogenous osteomyelitis, ankle and foot

  • Use M86.08 for Acute hematogenous osteomyelitis, other sites

  • Use M86.09 for Acute hematogenous osteomyelitis, multiple sites

  • M86.1 for Other acute osteomyelitis

  • Use M86.10 for Other acute osteomyelitis, unspecified site

  • M86.11 for Other acute osteomyelitis, shoulder

  • M86.12 for Other acute osteomyelitis, humerus

  • M86.13 for Other acute osteomyelitis, radius and ulna

  • M86.14 for Other acute osteomyelitis, hand

  • M86.15 for Other acute osteomyelitis, femur

  • M86.16 for Other acute osteomyelitis, tibia and fibula

  • M86.17 for Other acute osteomyelitis, ankle and foot

  • Use M86.18 for Other acute osteomyelitis, other site

  • Use M86.19 for Other acute osteomyelitis, multiple sites

  • M86.2 for Subacute osteomyelitis

  • Use M86.20 for Subacute osteomyelitis, unspecified site

  • M86.21 for Subacute osteomyelitis, shoulder

  • M86.22 for Subacute osteomyelitis, humerus

  • M86.23 for Subacute osteomyelitis, radius and ulna

  • M86.24 for Subacute osteomyelitis, hand

  • M86.25 for Subacute osteomyelitis, femur

  • M86.26 for Subacute osteomyelitis, tibia and fibula

  • M86.27 for Subacute osteomyelitis, ankle and foot

  • Use M86.28 for Subacute osteomyelitis, other site

  • Use M86.29 for Subacute osteomyelitis, multiple sites

  • M86.3 for Chronic multifocal osteomyelitis

  • Use M86.30 for Chronic multifocal osteomyelitis, unspecified site

  • M86.31 for Chronic multifocal osteomyelitis, shoulder

  • M86.32 for Chronic multifocal osteomyelitis, humerus

  • M86.33 for Chronic multifocal osteomyelitis, radius and ulna

  • M86.34 for Chronic multifocal osteomyelitis, hand

  • M86.35 for Chronic multifocal osteomyelitis, femur

  • M86.36 for Chronic multifocal osteomyelitis, tibia and fibula

  • M86.37 for Chronic multifocal osteomyelitis, ankle and foot

  • Use M86.38 for Chronic multifocal osteomyelitis, other site

  • Use M86.39 for Chronic multifocal osteomyelitis, multiple sites

  • M86.4 for Chronic osteomyelitis with draining sinus

  • Use M86.40 for Chronic osteomyelitis with draining sinus, unspecified site

  • M86.41 for Chronic osteomyelitis with draining sinus, shoulder

  • M86.42 for Chronic osteomyelitis with draining sinus, humerus

  • M86.43 for Chronic osteomyelitis with draining sinus, radius and ulna

  • M86.44 for Chronic osteomyelitis with draining sinus, hand

  • M86.45 for Chronic osteomyelitis with draining sinus, femur

  • M86.46 for Chronic osteomyelitis with draining sinus, tibia and fibula

  • M86.47 for Chronic osteomyelitis with draining sinus, ankle and foot

  • Use M86.48 for Chronic osteomyelitis with draining sinus, other site

  • Use M86.49 for Chronic osteomyelitis with draining sinus, multiple sites

  • M86.5 for Other chronic hematogenous osteomyelitis

  • Use M86.50 for Other chronic hematogenous osteomyelitis, unspecified site

  • M86.51 for Other chronic hematogenous osteomyelitis, shoulder

  • M86.52 for Other chronic hematogenous osteomyelitis, humerus

  • M86.53 for Other chronic hematogenous osteomyelitis, radius and ulna

  • M86.54 for Other chronic hematogenous osteomyelitis, hand

  • M86.55 for Other chronic hematogenous osteomyelitis, femur

  • M86.56 for Other chronic hematogenous osteomyelitis, tibia and fibula

  • M86.57 for Other chronic hematogenous osteomyelitis, ankle and foot

  • Use M86.58 for Other chronic hematogenous osteomyelitis, other site

  • Use M86.59 for Other chronic hematogenous osteomyelitis, multiple sites

  • M86.6 for Other chronic osteomyelitis

  • Use M86.60 for Other chronic osteomyelitis, unspecified site

  • M86.61 for Other chronic osteomyelitis, shoulder

  • M86.62 for Other chronic osteomyelitis, humerus

  • M86.63 for Other chronic osteomyelitis, radius and ulna

  • M86.64 for Other chronic osteomyelitis, hand

  • M86.65 for Other chronic osteomyelitis, thigh

  • M86.66 for Other chronic osteomyelitis, tibia and fibula

  • M86.67 for Other chronic osteomyelitis, ankle and foot

  • Use M86.68 for Other chronic osteomyelitis, other site

  • Use M86.69 for Other chronic osteomyelitis, multiple sites

  • M86.8 for Other osteomyelitis

  • M86.8X for Other osteomyelitis

  • Use M86.9 for Osteomyelitis, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M86: its own notes plus those printed at block M86-M90 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On M86 itself
From Block M86-M90 Other osteopathies applies to 732 codes
  • postprocedural osteopathies (M96.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On M86 itself
From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • 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)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • code (B95-B97) to identify infectious agent
  • code to identify major osseous defect, if applicable (M89.7-)

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M86, its category, or a range that includes it.

Code First 1

These codes say to code first a condition named in the note, and M86 is one of the conditions named.

Clinical InformationClinical

  • 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.

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M86Overview

What is the ICD-10 code for osteomyelitis?

M86 is the ICD-10-CM category for osteomyelitis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is M86 (Osteomyelitis) a billable code?

No. This is a category header that groups the codes for osteomyelitis, and headers cannot be submitted on claims. Claims for osteomyelitis need a more specific code from this category, such as M86.00, M86.011, and M86.012.

Can M86 be reported with B67.2?

Not as a rule. The Excludes1 note on M86 lists "echinococcus (B67.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does M86 need an additional code?

When the condition applies, yes. The Use Additional Code note reads: code (B95-B97) to identify infectious agent; code to identify major osseous defect, if applicable (M89.7-). The additional code is reported after M86.