ICD-10-CM 2027
ICD-10 code for Thornwaldt's cyst
From the official ICD-10-CM alphabetic index entry “Cyst (colloid) (mucous) (simple) (retention) › Thornwaldt's”. Page updated September 29, 2026.
About coding Thornwaldt's cyst
The ICD-10-CM code for Thornwaldt's cyst is J39.2 (Other diseases of pharynx).
Within J39, choose J39.2 (Other diseases of pharynx) only when documentation doesn't support a more specific option: Retropharyngeal and parapharyngeal abscess (J39.0), other abscess of pharynx (J39.1), upper respiratory tract hypersensitivity reaction, site unspecified (J39.3), other specified diseases of upper respiratory tract (J39.8) and disease of upper respiratory tract, unspecified (J39.9).
The conditions in its Excludes2 note aren't part of J39.2, but may be coded alongside it if the patient has both: chronic pharyngitis (J31.2) and ulcerative pharyngitis (J02.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about Thornwaldt's cyst ICD-10 codes
What is the ICD-10 code for Thornwaldt's cyst?
- J39.2 — Other diseases of pharynx.
Is J39.2 billable?
- Yes. J39.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can J39.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict J39.2 as a principal diagnosis.
Is J39.2 a CC or MCC?
- No. J39.2 is neither a CC nor an MCC under MS-DRG v44.0.