L05.91 Pilonidal cyst without abscess

Billable ICD-10-CM code, FY2026.

Applicable to

• Pilonidal dimple
• Postanal dimple
• Pilonidal cyst NOS

Excludes2 (not included here)

• congenital sacral dimple (Q82.6)
• parasacral dimple (Q82.6)

MS-DRG index

Defines the logic of DRG(s) 602-603 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 685.1 Pilonidal cyst without mention of abscess (approximate)

Code annotations containing back-references to L05.91

Back-references to L05.91

• Type 2 Excludes: Q82.6 Congenital sacral dimple ("pilonidal cyst without abscess (L05.91)")

Back-references to L05

• Type 2 Excludes: L89 Pressure ulcer ("skin infections (L00-L08)")
• Type 2 Excludes: L97 Non-pressure chronic ulcer of lower limb, not elsewhere classified ("skin infections (L00-L08)")
• Type 2 Excludes: L98.4 Non-pressure chronic ulcer of skin, not elsewhere classified ("skin infections (L00-L08)")
• Type 2 Excludes: L98.A Non-pressure chronic ulcer of upper limb, not elsewhere classified ("skin infections (L00-L08)")
• Type 1 Excludes: Q43.6 Congenital fistula of rectum and anus ("pilonidal fistula or sinus (L05.-)")
• Type 1 Excludes: Q82 Other congenital malformations of skin ("pilonidal cyst or sinus (L05.-)")

Diagnosis Index entries for L05.91

• Cyst (colloid) (mucous) (simple) (retention) › pilonidal (infected) (rectum)

Nearby codes

• L05 Pilonidal cyst and sinus
• L05.0 Pilonidal cyst and sinus with abscess
• L05.01 Pilonidal cyst with abscess
• L05.02 Pilonidal sinus with abscess
• L05.9 Pilonidal cyst and sinus without abscess
• L05.91 Pilonidal cyst without abscess (this code)
• L05.92 Pilonidal sinus without abscess