ICD-9-CM diagnosis code (retired)
522.4 — Acute apical periodontitis of pulpal origin
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 522.4
522.4 is an ICD-9-CM diagnosis code for acute apical periodontitis of pulpal origin. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to one ICD-10-CM code, K04.4 (Acute apical periodontitis of pulpal origin). The match is exact.
ICD-10-CM equivalents
- K04.4Acute apical periodontitis of pulpal originexact match
Common questions about 522.4
What is the ICD-10 code for ICD-9 522.4?
- The GEMs map 522.4 to ICD-10-CM K04.4.
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.