ICD-10-CM 2027
ICD-10 code for Parakeratosis
From the official ICD-10-CM alphabetic index entry “Parakeratosis”. Page updated September 29, 2026.
About coding Parakeratosis
The ICD-10-CM code for Parakeratosis is R23.4 (Changes in skin texture). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on R23.4.
Within R23 (other skin changes), R23.4 is specifically for changes in skin texture. Related codes cover Cyanosis (R23.0), Pallor (R23.1), Flushing (R23.2), spontaneous ecchymoses (R23.3), other skin changes (R23.8) and unspecified skin changes (R23.9).
Don't report R23.4 together with the conditions in its Excludes1 note: epidermal thickening NOS (L85.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific Parakeratosis codes (official index)
- variegata L41.0 — Pityriasis lichenoides et varioliformis acuta
Don't confuse with (Excludes1 for R23.4)
- epidermal thickening NOS (L85.9)
Common questions about Parakeratosis ICD-10 codes
What is the ICD-10 code for Parakeratosis?
- R23.4 — Changes in skin texture. More specific codes apply when the documentation supports them: L41.0.
What is the ICD-10 code for variegata parakeratosis?
- L41.0 — Pityriasis lichenoides et varioliformis acuta.
Is R23.4 billable?
- Yes. R23.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R23.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R23.4 as a principal diagnosis.
Is R23.4 a CC or MCC?
- No. R23.4 is neither a CC nor an MCC under MS-DRG v44.0.