Dentofacial anomalies [including malocclusion] and other disorders of jaw (M26-M27) ICD-10-CM
The M26–M27 section covers dentofacial anomalies [including malocclusion] and other disorders of jaw with 115 ICD-10-CM diagnosis codes, of which 94 are billable in fiscal year 2026. The section is organized into the 2 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.
Code Ranges in This Section 2 ranges · 115 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| M26 | Dentofacial anomalies [including malocclusion] (M26) | 95 | 78 |
| M27 | Other diseases of jaws (M27) | 20 | 16 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the M26–M27 Code Range
ICD-10 codes M26-M27 cover a wide range of dentofacial anomalies including jaw size irregularities, malocclusion, and disorders affecting jaw function and structure. These codes are used to classify conditions like malocclusion (misaligned bite), jaw size abnormalities such as maxillary or mandibular hyperplasia and hypoplasia, and temporomandibular joint (TMJ) disorders.
This code chapter includes detailed classifications for abnormalities in the size and relationship of jaws, such as maxillary hyperplasia (overgrowth of upper jaw) and mandibular hypoplasia (underdeveloped lower jaw). It also addresses dental arch relationship issues, covering Angle's classes I, II, and III malocclusions, open bites, crossbites, and spacing problems among erupted teeth. Functional abnormalities like abnormal jaw closure, limited mandibular movement, and TMJ disorders—including arthritis, arthralgia, disc displacement, and ankylosis—are catalogued here. The range also encompasses developmental and inflammatory diseases of the jaw (e.g., giant cell granuloma, osteomyelitis), alveolar anomalies (such as maxillary or mandibular hyperplasia and hypoplasia), and complications related to dental implants. The inclusion of synonyms like maxillary jaw size anomaly, Angle's class malocclusion, and temporomandibular joint pain dysfunction syndrome helps link common clinical terms to their corresponding ICD codes, aiding accurate medical coding and diagnosis documentation.
Questions About This Page
How many codes are in the M26-M27 range?
The M26-M27 range contains 115 ICD-10-CM diagnosis codes in FY 2026. 94 of them are billable, and the rest are category headers that organize the section.
What conditions does M26-M27 cover?
The range covers dentofacial anomalies [including malocclusion] and other disorders of jaw. 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.
