Alphabetic Index FY2027

M26

Dentofacial anomalies [including malocclusion]

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M26–M27 Dentofacial anomalies [including malocclusion] and other disorders of jaw

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

M26 is a non-billable ICD-10-CM code category for dentofacial anomalies [including malocclusion]. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M26.0 Major anomalies of jaw size, M26.1 Anomalies of jaw-cranial base relationship, M26.2 Anomalies of dental arch relationship, M26.3 Anomalies of tooth position of fully erupted tooth or teeth and 6 more. Its coding notes include 2 Excludes1 entries and 10 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Also from chapter/block level (2 notes)
Inherited from M26–M27 Dentofacial anomalies [including malocclusion] and other disorders of jaw
  • hemifacial atrophy or hypertrophy (Q67.4)
  • unilateral condylar hyperplasia or hypoplasia (M27.8)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (10 notes)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • 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)

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More specific codes under M26 10