All ICD10 Codes

R21

Billable
ChapterR00–R99
Rankcategory
Official Description

Rash and other nonspecific skin eruption

Metadata & Insights
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (R00-R99).

CH18 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • abnormal findings on antenatal screening of mother (O28.-)
  • certain conditions originating in the perinatal period (P04-P96)
  • signs and symptoms classified in the body system chapters
  • signs and symptoms of breast (N63, N64.5)

R20-R23 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)

Instructional Notes

Includes
  • rash NOS
Excludes1(Not coded here. Use a different code.)
  • specified type of rash- code to condition
  • vesicular eruption (R23.8)

Clinical Hierarchy

BillableHas subcodes
CH18Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
R20-R23Symptoms and signs involving the skin and subcutaneous tissue (R20-R23)
R21Rash and other nonspecific skin eruptionBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to R21:

blockR20-R23
Symptoms and signs involving the skin and subcutaneous tissue (R20-R23)
View context instructions
chapterCH18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
View context instructions

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 606
Minor Skin Disorders with MCC
DRG 607
Minor Skin Disorders without MCC

Cross Reference

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