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. Code separately if applicable.)

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 Codes Billable Only

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Internal Codes

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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
K01.0|
Embedded teeth
K01.1|
Impacted teeth
K02.3|
Arrested dental caries
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
K02.61|
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
K03.0|
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
K03.81|
Cracked tooth
K03.89|
Other specified diseases of hard tissues of teeth
K03.9|
Disease of hard tissues of teeth, unspecified
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
K04.8|
Radicular cyst
K04.90|
Unspecified diseases of pulp and periapical tissues
K04.99|
Other diseases of pulp and periapical tissues
K05.00|
Acute gingivitis, plaque induced
K05.01|
Acute gingivitis, non-plaque induced
K05.10|
Chronic gingivitis, plaque induced
K05.11|
Chronic gingivitis, non-plaque induced
K05.20|
Aggressive periodontitis, unspecified
K05.211|
Aggressive periodontitis, localized, slight

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