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ICD-10-CM 2027 diagnosis code

L05.01Pilonidal cyst with abscess

✓ Billable / specificCC — complication/comorbidity

L05.01 is a valid, billable ICD-10-CM code for pilonidal cyst with abscess. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About L05.01

L05.01 is the ICD-10-CM diagnosis code for pilonidal cyst with abscess. It belongs to category L05 (pilonidal cyst and sinus), block L00-L08 (infections of the skin and subcutaneous tissue) and chapter 12 (diseases of the skin and subcutaneous tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within L05.0 (pilonidal cyst and sinus with abscess), L05.01 is specifically for pilonidal cyst with abscess. Related codes cover sinus with abscess (L05.02).

The conditions in its Excludes2 note aren't part of L05.01, but may be coded alongside it if the patient has both: congenital sacral dimple (Q82.6) and parasacral dimple (Q82.6).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 602 (Cellulitis with MCC, relative weight 1.4273) and DRG 603 (Cellulitis without MCC, relative weight 0.8635), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 685.0 (pilonidal cyst with abscess).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Pilonidal abscess
  • Pilonidal dimple with abscess
  • Postanal dimple with abscess
Excludes2Not included here — may be reported together if both conditions exist
  • congenital sacral dimple (Q82.6)
  • parasacral dimple (Q82.6)

Notes that apply from higher levels

Instructions written at a parent level also apply to L05.01.

Broader instructions also apply from L00-L08 Infections of the skin and subcutaneous tissue and Chapter 12: Diseases of the skin and subcutaneous tissue.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to L05.01.

Codes whose notes reference L05.01

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast

ICD-9-CM equivalent

Converter →
  • 685.0Pilonidal cyst with abscessapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about L05.01

Is L05.01 billable?

Yes. L05.01 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can L05.01 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict L05.01 as a principal diagnosis.

Is L05.01 a CC or MCC?

L05.01 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does L05.01 group to?

L05.01 is used in the MS-DRG v44.0 logic for MS-DRG 602 (Cellulitis with MCC) and MS-DRG 603 (Cellulitis without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for L05.01?

The CMS General Equivalence Mappings map L05.01 to ICD-9-CM 685.0.