K04.6 Periapical abscess with sinus

Billable ICD-10-CM code, FY2026.

Applicable to

• Dental abscess with sinus
• Dentoalveolar abscess with sinus

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 522.7 Periapical abscess with sinus

Code annotations containing back-references to K04.6

Back-references to K04.6

• Type 1 Excludes: K05.2 Aggressive periodontitis ("periapical abscess with sinus (K04.6)")
• Type 2 Excludes: K12.2 Cellulitis and abscess of mouth ("periapical abscess (K04.6-K04.7)")

Diagnosis Index entries for K04.6

• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › alveolar › with sinus
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › apical (tooth) › with sinus (alveolar)
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › dental › with sinus (alveolar)
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › dentoalveolar › with sinus
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › lateral (alveolar) › with sinus
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › maxilla, maxillary › molar (tooth) › with sinus
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › periapical › with sinus (alveolar)
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › root, tooth › with sinus (alveolar)
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › septal, dental › with sinus (alveolar)
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › tooth, teeth (root) › with sinus (alveolar)
• Fistula (cutaneous) › alveolar process
• Fistula (cutaneous) › dental
• Fistula (cutaneous) › from periapical abscess
• Gumboil › with sinus
• Parulis › with sinus
• Sinus › dental

Nearby codes

• 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 (this code)
• K04.7 Periapical abscess without sinus
• K04.8 Radicular cyst
• K04.9 Other and unspecified diseases of pulp and periapical tissues
• K04.90 Unspecified diseases of pulp and periapical tissues
• K04.99 Other diseases of pulp and periapical tissues