2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Diseases Of Oral Cavity, Salivary Glands, And Jaws 520-529 > Diseases Of Pulp And Periapical Tissues 522.* > 2006 ICD-9-CM Diagnosis 522.6 Chronic apical periodontitis View the most recent version of ICD-9-CM 522.6 Inflammation of the PERIAPICAL TISSUE. It includes general, unspecified, or acute nonsuppurative inflammation. Chronic nonsuppurative inflammation is PERIAPICAL GRANULOMA. Suppurative inflammation is PERIAPICAL ABSCESS. 522.6 is a specific code that can be used to specify a diagnosis 522.6 contains 5 index entries View the ICD-9-CM Volume 1 522.* hierarchy Alternate Terminology Apical or periapical granuloma Apical periodontitis NOS  Index entries containing 522.6: Granuloma NEC 686.1 apical 522.6 dental 522.6 periapical 522.6 pyogenic, pyogenicum (skin) 686.1 maxillary alveolar ridge 522.6 Periodontitis (chronic) (complex) (compound) (simplex) apical 522.6 acute (pulpal origin) 522.4