Chapter 11

K00–K95: Diseases of the Digestive System

Diseases of the Digestive System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • 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)
All CodesBillable Only
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Internal Codes
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  • K00—

    Disorders of tooth development and eruption

  • K00.0—

    Anodontia

  • K00.1—

    Supernumerary teeth

  • K00.2—

    Abnormalities of size and form of teeth

  • K00.3—

    Mottled teeth

  • K00.4—

    Disturbances in tooth formation

  • K00.5—

    Hereditary disturbances in tooth structure, not elsewhere classified

  • K00.6—

    Disturbances in tooth eruption

  • K00.7—

    Teething syndrome

  • K00.8—

    Other disorders of tooth development

  • K00.9—

    Disorder of tooth development, unspecified

  • K01—

    Embedded and impacted teeth

  • K01.0—

    Embedded teeth

  • K01.1—

    Impacted teeth

  • K02—

    Dental caries

  • K02.3—

    Arrested dental caries

  • K02.5—

    Dental caries on pit and fissure surface

  • K02.51—

    Dental caries on pit and fissure surface limited to enamel

  • K02.52—

    Dental caries on pit and fissure surface penetrating into dentin

  • K02.53—

    Dental caries on pit and fissure surface penetrating into pulp

  • K02.6—

    Dental caries on smooth surface

  • K02.61—

    Dental caries on smooth surface limited to enamel

  • K02.62—

    Dental caries on smooth surface penetrating into dentin

  • K02.63—

    Dental caries on smooth surface penetrating into pulp

  • K02.7—

    Dental root caries

  • K02.9—

    Dental caries, unspecified

  • K03—

    Other diseases of hard tissues of teeth

  • K03.0—

    Excessive attrition of teeth

  • K03.1—

    Abrasion of teeth

  • K03.2—

    Erosion of teeth

  • K03.3—

    Pathological resorption of teeth

  • K03.4—

    Hypercementosis

  • K03.5—

    Ankylosis of teeth

  • K03.6—

    Deposits [accretions] on teeth

  • K03.7—

    Posteruptive color changes of dental hard tissues

  • K03.8—

    Other specified diseases of hard tissues of teeth

  • K03.81—

    Cracked tooth

  • K03.89—

    Other specified diseases of hard tissues of teeth

  • K03.9—

    Disease of hard tissues of teeth, unspecified

  • K04—

    Diseases of pulp and periapical tissues

  • K04.0—

    Pulpitis

  • K04.01—

    Reversible pulpitis

  • K04.02—

    Irreversible pulpitis

  • K04.1—

    Necrosis of pulp

  • K04.2—

    Pulp degeneration

  • K04.3—

    Abnormal hard tissue formation in pulp

  • K04.4—

    Acute apical periodontitis of pulpal origin

  • K04.5—

    Chronic apical periodontitis

  • K04.6—

    Periapical abscess with sinus

  • K04.7—

    Periapical abscess without sinus

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