M26 vs M27.8
M26 (Dentofacial anomalies [including malocclusion]) compared with M27.8 (Other specified diseases of jaws), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. M26 carries an Excludes1 note covering M27.8: “unilateral condylar hyperplasia or hypoplasia (M27.8)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| M26Dentofacial anomalies [including malocclusion] | M27.8Other specified diseases of jaws | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Dentofacial anomalies [including malocclusion] is a non-billable ICD-10-CM category code (M26). | Other specified diseases of jaws is a billable ICD-10-CM diagnosis code (M27.8). |
| Includes | — | Cherubism Exostosis Fibrous dysplasia Unilateral condylar hyperplasia |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources