ICD-10-CM 2027
ICD-10 code for pilonidal cyst
From the official ICD-10-CM alphabetic index entry “Cyst (colloid) (mucous) (simple) (retention) › pilonidal (infected) (rectum)”. Page updated September 29, 2026.
About coding pilonidal cyst
The ICD-10-CM code for pilonidal cyst is L05.91 (Pilonidal cyst without abscess). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on L05.91.
Within L05.9, choose L05.91 (cyst without abscess) only when documentation doesn't support a more specific option: sinus without abscess (L05.92).
The conditions in its Excludes2 note aren't part of L05.91, but may be coded alongside it if the patient has both: congenital sacral dimple (Q82.6) and parasacral dimple (Q82.6).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific pilonidal cyst codes (official index)
Common questions about pilonidal cyst ICD-10 codes
What is the ICD-10 code for pilonidal cyst?
- L05.91 — Pilonidal cyst without abscess. More specific codes apply when the documentation supports them: L05.01, C44.59.
What is the ICD-10 code for malignant pilonidal cyst?
- C44.59 — Other specified malignant neoplasm of skin of trunk (header code; choose a more specific subcode).
Is L05.91 billable?
- Yes. L05.91 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L05.91 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L05.91 as a principal diagnosis.
Is L05.91 a CC or MCC?
- No. L05.91 is neither a CC nor an MCC under MS-DRG v44.0.