DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

L99 diagnosis code · Billable category · FY2027

L99 Other disorders of skin and subcutaneous tissue in diseases classified elsewhere

  • Billable
  • Not CC/MCC
  • POA reported

L99 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

  1. Chapter 12 Diseases of the skin and subcutaneous tissue (L00-L99)
  2. L80-L99 Other disorders of the skin and subcutaneous tissue (L80-L99)
  3. L99 Other disorders of skin and subcutaneous tissue in diseases classified elsewhere
CC / MCC
Neither
MS-DRG
606-607
HCC V28
–
POA
Reported
Code Editor
Manifestation
Index entries
5

Instructions

At L99

Excludes1

  • skin disorders in diabetes (E08-E13 with .62-) E08 E13
  • skin disorders in gonorrhea (A54.89) A54.89
  • skin disorders in syphilis (A51.31, A52.79) A51.31 A52.79

Code first

  • underlying disease, such as:
  • amyloidosis (E85.-) E85

Notes that also apply

Chapter 12 instructions (Excludes2 10): printed on the chapter 12 page.

Index entries

  • Amyloidosis (generalized) (primary)skin (lichen) (macular) → E85.4 [L99]
  • Lichenamyloidosis → E85.4 [L99]
  • Degeneration, degenerativecutisamyloid → E85.4 [L99]
  • Degeneration, degenerativeskinamyloid → E85.4 [L99]
  • Disease, diseasedskindue to metabolic disorder NEC → E88.9 [L99]

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for L99
CC / MCCNeither
Appendix BMDC 09 Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast, MS-DRG 606-607 (Minor Skin Disorders with MCC…)
Code EditorManifestation code: not allowed as principal diagnosis
POAReported
HCC V28–

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy