ICD-10-CM 2027
ICD-10 code for nodosum erythema
From the official ICD-10-CM alphabetic index entry “Erythema, erythematous (infectional) (inflammation) › nodosum”. Page updated September 29, 2026.
About coding nodosum erythema
The ICD-10-CM code for nodosum erythema is L52 (Erythema nodosum). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on L52.
Don't report L52 together with the conditions in its Excludes1 note: tuberculous erythema nodosum (A18.4).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 595 (Major Skin Disorders with MCC, relative weight 2.0239) and DRG 596 (Major Skin Disorders without MCC, relative weight 1.1071), 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.
More specific nodosum erythema codes (official index)
- tuberculous A18.4 — Tuberculosis of skin and subcutaneous tissue
Don't confuse with (Excludes1 for L52)
- tuberculous erythema nodosum (A18.4)
Common questions about nodosum erythema ICD-10 codes
What is the ICD-10 code for nodosum erythema?
- L52 — Erythema nodosum. More specific codes apply when the documentation supports them: A18.4.
What is the ICD-10 code for tuberculous nodosum erythema?
- A18.4 — Tuberculosis of skin and subcutaneous tissue.
Is L52 billable?
- Yes. L52 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L52 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L52 as a principal diagnosis.
Is L52 a CC or MCC?
- No. L52 is neither a CC nor an MCC under MS-DRG v44.0.