ICD-10-CM Code For Chromomycosis And Pheomycotic Abscess: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group B43 includes chronic cutaneous and subcutaneous fungal infections such as chromomycosis (chromoblastomycosis) and pheomycotic abscesses caused by dematiaceous fungi, covering nodular, verrucous, and abscess-forming lesions. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving chronic fungal skin and soft tissue infection, including extent of tissue involvement and presence of complications. Accurate coding within the ICD-10-CM B43 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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ICD-10-CM B43: Chromomycosis And Pheomycotic Abscess Overview

The ICD-10-CM B43 code group covers chronic fungal infections such as chromomycosis (chromoblastomycosis) and pheomycotic abscesses that typically affect the skin and subcutaneous tissues. These conditions are caused by traumatic inoculation of dematiaceous fungi and can lead to nodular, verrucous, or abscess-forming lesions. Accurate coding ensures the clinical picture and disease complexity are documented for correct claim processing and appropriate reimbursement.

When to Use

Use a code from this group when a clinician documents a diagnosis of chromomycosis or a pheomycotic abscess confirmed by clinical evaluation, histopathology, or microbiologic identification of causative fungi. Select the code that reflects the specific presentation, anatomical site, and any documented complications to accurately represent the clinical scenario.

ICD-10-CM Codes

5 rows

ICD-10-CM Code	Description
B43.0	Cutaneous chromomycosis
B43.1	Pheomycotic brain abscess
B43.2	Subcutaneous pheomycotic abscess and cyst
B43.8	Other forms of chromomycosis
B43.9	Chromomycosis, unspecified

DRG Codes

3 rows

DRG Code	Description
867	Other Infectious and Parasitic Diseases Diagnoses with MCC
868	Other Infectious and Parasitic Diseases Diagnoses with CC
869	Other Infectious and Parasitic Diseases Diagnoses without CC/MCC

Typical Clinical Scenarios

An adult agricultural worker presents to the dermatology clinic with several slowly enlarging, verrucous nodules and plaques on the lower leg that developed over months after a thorn puncture wound; biopsy and fungal culture confirm chromoblastomycosis (chromomycosis) due to dematiaceous fungi. A chronic, indolent cutaneous fungal infection with characteristic sclerotic bodies leads to assignment of a diagnosis from this group for targeted antifungal management and documentation. Typical codes: B43.0, B43.9
A patient in the emergency department has a painful, fluctuant subcutaneous abscess on the forearm following incomplete drainage of a prior fungal skin lesion; incision and drainage are performed and operative pathology identifies a phaeomycotic abscess. This acute complication of a fungal soft-tissue infection requires coding to capture the active abscess process and its fungal etiology. Typical codes: B43.2, B43.9
An immunocompromised elderly patient with chronic, widespread verrucous skin lesions and secondary bacterial superinfection is seen in inpatient consultation after months of progressive disease; tissue culture identifies mixed dematiaceous fungal species consistent with chronic chromomycosis with complications. Coding reflects the chronic underlying fungal infection and its sequelae for inpatient care and multidisciplinary management. Typical codes: B43.1, B43.8

Related Codes

B35-DERMATOPHYTOSIS

ICD-10-CM Code For Dermatophytosis: Group Overview

B36-OTHER-SUPERFICIAL-MYCOSES

ICD-10-CM Code For Other Superficial Mycoses: Group Overview

B37-CANDIDIASIS

ICD-10-CM Code For Candidiasis: Group Overview

B38-COCCIDIOIDOMYCOSIS

ICD-10-CM Code For Coccidioidomycosis: Group Overview

B39-HISTOPLASMOSIS

ICD-10-CM Code For Histoplasmosis: Group Overview

B41-PARACOCCIDIOIDOMYCOSIS

ICD-10-CM Code For Paracoccidioidomycosis: Group Overview

B42-SPOROTRICHOSIS-INFECTION

ICD-10-CM Code For Sporotrichosis: Group Overview

B44-ASPERGILLOSIS

ICD-10-CM Code For Aspergillosis: Group Overview

B45-CRYPTOCOCCOSIS

ICD-10-CM Code For Cryptococcosis: Group Overview

B46-ZYGOMYCOSIS

ICD-10-CM Code For Zygomycosis: Group Overview

Showing 1–10 of 13

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

5 rows

ICD-10-CM Code	Description
B43.0	Cutaneous chromomycosis
B43.1	Pheomycotic brain abscess
B43.2	Subcutaneous pheomycotic abscess and cyst
B43.8	Other forms of chromomycosis
B43.9	Chromomycosis, unspecified

DRG Codes

3 rows

DRG Code	Description
867	Other Infectious and Parasitic Diseases Diagnoses with MCC
868	Other Infectious and Parasitic Diseases Diagnoses with CC
869	Other Infectious and Parasitic Diseases Diagnoses without CC/MCC

Typical Clinical Scenarios

An adult agricultural worker presents to the dermatology clinic with several slowly enlarging, verrucous nodules and plaques on the lower leg that developed over months after a thorn puncture wound; biopsy and fungal culture confirm chromoblastomycosis (chromomycosis) due to dematiaceous fungi. A chronic, indolent cutaneous fungal infection with characteristic sclerotic bodies leads to assignment of a diagnosis from this group for targeted antifungal management and documentation. Typical codes: B43.0, B43.9
A patient in the emergency department has a painful, fluctuant subcutaneous abscess on the forearm following incomplete drainage of a prior fungal skin lesion; incision and drainage are performed and operative pathology identifies a phaeomycotic abscess. This acute complication of a fungal soft-tissue infection requires coding to capture the active abscess process and its fungal etiology. Typical codes: B43.2, B43.9
An immunocompromised elderly patient with chronic, widespread verrucous skin lesions and secondary bacterial superinfection is seen in inpatient consultation after months of progressive disease; tissue culture identifies mixed dematiaceous fungal species consistent with chronic chromomycosis with complications. Coding reflects the chronic underlying fungal infection and its sequelae for inpatient care and multidisciplinary management. Typical codes: B43.1, B43.8

Related Codes

B35-DERMATOPHYTOSIS

ICD-10-CM Code For Dermatophytosis: Group Overview

B36-OTHER-SUPERFICIAL-MYCOSES

ICD-10-CM Code For Other Superficial Mycoses: Group Overview

B37-CANDIDIASIS

ICD-10-CM Code For Candidiasis: Group Overview

B38-COCCIDIOIDOMYCOSIS

ICD-10-CM Code For Coccidioidomycosis: Group Overview

B39-HISTOPLASMOSIS

ICD-10-CM Code For Histoplasmosis: Group Overview

B41-PARACOCCIDIOIDOMYCOSIS

ICD-10-CM Code For Paracoccidioidomycosis: Group Overview

B42-SPOROTRICHOSIS-INFECTION

ICD-10-CM Code For Sporotrichosis: Group Overview

B44-ASPERGILLOSIS

ICD-10-CM Code For Aspergillosis: Group Overview

B45-CRYPTOCOCCOSIS

ICD-10-CM Code For Cryptococcosis: Group Overview

B46-ZYGOMYCOSIS

ICD-10-CM Code For Zygomycosis: Group Overview

Showing 1–10 of 13

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Chromomycosis And Pheomycotic Abscess: Group Overview

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ICD-10-CM B43: Chromomycosis And Pheomycotic Abscess Overview

ICD-10-CM Code For Chromomycosis And Pheomycotic Abscess: Group Overview

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ICD-10-CM B43: Chromomycosis And Pheomycotic Abscess Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are covered under ICD-10-CM B43?

What specific codes are included in the B43 group and when are they used?

How does accurate coding in the B43 group affect claims?

Which DRG categories may be related to diagnoses coded from B43?

What clinical scenarios are appropriate to document using B43 codes?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are covered under ICD-10-CM B43?

What specific codes are included in the B43 group and when are they used?

How does accurate coding in the B43 group affect claims?

Which DRG categories may be related to diagnoses coded from B43?

What clinical scenarios are appropriate to document using B43 codes?

References