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ICD-10-CM 2027

ICD-10 code for Blastomycotic dermatitis

B40.3

Cutaneous blastomycosis

✓ Billable / specificCC — complication/comorbidity

From the official ICD-10-CM alphabetic index entry “Dermatitis (eczematous) › blastomycotic”. Page updated September 29, 2026.

About coding Blastomycotic dermatitis

The ICD-10-CM code for Blastomycotic dermatitis is B40.3 (Cutaneous blastomycosis).

Within B40 (blastomycosis), B40.3 is specifically for cutaneous blastomycosis. Related codes cover acute pulmonary blastomycosis (B40.0), chronic pulmonary blastomycosis (B40.1), pulmonary blastomycosis, unspecified (B40.2), disseminated blastomycosis (B40.7), other forms of blastomycosis (B40.8) and unspecified (B40.9).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

Common questions about Blastomycotic dermatitis ICD-10 codes

What is the ICD-10 code for Blastomycotic dermatitis?

B40.3 — Cutaneous blastomycosis.

Is B40.3 billable?

Yes. B40.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can B40.3 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict B40.3 as a principal diagnosis.

Is B40.3 a CC or MCC?

B40.3 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.