| K023 | Arrested dental caries |
| K025 | Dental caries on pit and fissure surface |
| K0251 | Dental caries on pit and fissure surface limited to enamel |
| K0252 | Dental caries on pit and fissure surface penetrating into dentin |
| K0253 | Dental caries on pit and fissure surface penetrating into pulp |
| K026 | Dental caries on smooth surface |
| K0261 | Dental caries on smooth surface limited to enamel |
| K0262 | Dental caries on smooth surface penetrating into dentin |
| K0263 | Dental caries on smooth surface penetrating into pulp |
| K027 | Dental root caries |
| K029 | Dental caries, unspecified |
| K03 | Other diseases of hard tissues of teeth |
| K030 | Excessive attrition of teeth |
| K031 | Abrasion of teeth |
| K032 | Erosion of teeth |
| K033 | Pathological resorption of teeth |
| K034 | Hypercementosis |
| K035 | Ankylosis of teeth |
| K036 | Deposits [accretions] on teeth |
| K037 | Posteruptive color changes of dental hard tissues |
| K038 | Other specified diseases of hard tissues of teeth |
| K0381 | Cracked tooth |
| K0389 | Other specified diseases of hard tissues of teeth |
| K039 | Disease of hard tissues of teeth, unspecified |
| K04 | Diseases of pulp and periapical tissues |
| K040 | Pulpitis |
| K0401 | Reversible pulpitis |
| K0402 | Irreversible pulpitis |
| K041 | Necrosis of pulp |
| K042 | Pulp degeneration |
| K043 | Abnormal hard tissue formation in pulp |
| K044 | Acute apical periodontitis of pulpal origin |
| K045 | Chronic apical periodontitis |
| K046 | Periapical abscess with sinus |
| K047 | Periapical abscess without sinus |
| K048 | Radicular cyst |
| K049 | Other and unspecified diseases of pulp and periapical tissues |
| K0490 | Unspecified diseases of pulp and periapical tissues |
| K0499 | Other diseases of pulp and periapical tissues |
| K05 | Gingivitis and periodontal diseases |
| K050 | Acute gingivitis |
| K0500 | Acute gingivitis, plaque induced |
| K0501 | Acute gingivitis, non-plaque induced |
| K051 | Chronic gingivitis |
| K0510 | Chronic gingivitis, plaque induced |
| K0511 | Chronic gingivitis, non-plaque induced |
| K052 | Aggressive periodontitis |
| K0520 | Aggressive periodontitis, unspecified |
| K0521 | Aggressive periodontitis, localized |
| K05211 | Aggressive periodontitis, localized, slight |