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

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

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

Code first

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

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

Excludes1 (never code together)

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

Code first

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

MS-DRG index

Defines the logic of DRG(s) 606-607 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 701.8 Other specified hypertrophic and atrophic conditions of skin (approximate)
• 709.8 Other specified disorders of skin (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Diagnosis Index entries for L99

• Amyloidosis (generalized) (primary) › skin (lichen) (macular)
• Degeneration, degenerative › cutis › amyloid
• Degeneration, degenerative › skin › amyloid
• Disease, diseased › skin › due to metabolic disorder NEC
• Lichen › amyloidosis

Nearby codes

• L99 Other disorders of skin and subcutaneous tissue in diseases classified elsewhere (this code)