Other osteopathies (M86-M90) ICD-10-CM
The M86–M90 section covers other osteopathies with 915 ICD-10-CM diagnosis codes, of which 716 are billable in fiscal year 2026. The section is organized into the 5 code ranges listed below.
Type 1 Excludes
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.
- postprocedural osteopathies M96
Code Ranges in This Section 5 ranges · 915 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| M86 | Osteomyelitis (M86) | 238 | 179 |
| M87 | Osteonecrosis (M87) | 259 | 217 |
| M88 | Osteitis deformans [Paget's disease of bone] (M88) | 35 | 26 |
| M89 | Other disorders of bone (M89) | 286 | 222 |
| M90 | Osteopathies in diseases classified elsewhere (M90) | 97 | 72 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the M86–M90 Code Range
ICD-10 codes M86 to M90 cover a group of bone diseases called osteopathies, including various forms of osteomyelitis, osteonecrosis, and other specific bone disorders. These codes help identify infections, blood supply problems, bone deformities, and growth abnormalities with precise locations specified for limbs and other bones.
The range includes codes for osteomyelitis (M86), which is bone infection and inflammation, with detailed distinctions such as acute, subacute, chronic, and draining sinus types. For medical coders and professionals, synonyms like "acute hematogenous osteomyelitis" (M86.00) and "chronic osteomyelitis with draining sinus" (M86.4) clarify usage when diagnosing and documenting infections. Codes starting with M87 address osteonecrosis, meaning bone death due to poor blood flow, including idiopathic, drug-induced, traumatic, or secondary forms. For example, "idiopathic aseptic necrosis of right shoulder" (M87.011) helps specify location and cause, aiding in accurate tracking and treatment. Disorders such as Paget's disease of bone (M88) and other bone growth or deformative conditions (M89) are also covered. The M90 codes include osteopathies linked to other diseases, offering precise locations and secondary conditions. These codes are essential for clinical documentation and targeted healthcare billing related to bone disease diagnosis and treatment.
Questions About This Page
How many codes are in the M86-M90 range?
The M86-M90 range contains 915 ICD-10-CM diagnosis codes in FY 2026. 716 of them are billable, and the rest are category headers that organize the section.
What conditions does M86-M90 cover?
The range covers other osteopathies. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
