ICD-10-CM Code For Other Bullous Disorders: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group L13 includes a range of blistering skin disorders not classified under more specific bullous categories, such as acquired or immunobullous conditions presenting with vesicles and bullae. These ICD-10-CM diagnosis codes are used to document clinical scenarios capturing disease distribution, presence of mucosal involvement, and complications like secondary infection or scarring. Accurate coding within the ICD-10-CM L13 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM L13: Other Bullous Disorders Overview

The ICD-10-CM L13 group comprises other bullous disorders — blistering skin diseases that are not classified elsewhere. These conditions affect the integumentary system and can involve localized or widespread blistering with variable mucosal involvement. Accurate coding matters for complete clinical documentation and appropriate reimbursement for dermatologic care.

When to Use

Use codes from this group when the clinical record documents a bullous disorder that is specified as "other" or does not meet criteria for more specific bullous diagnoses. Assign codes to reflect distribution, presence of mucosal involvement, and any associated complications such as infection or scarring.

ICD-10-CM Codes

4 rows

ICD-10-CM Code	Description
L13.0	Dermatitis herpetiformis
L13.1	Subcorneal pustular dermatitis
L13.8	Other specified bullous disorders
L13.9	Bullous disorder, unspecified

DRG Codes

4 rows

DRG Code	Description
595	Major Skin Disorders with MCC
596	Major Skin Disorders without MCC
606	Minor Skin Disorders with MCC
607	Minor Skin Disorders without MCC

Typical Clinical Scenarios

An elderly patient presents to the emergency department with sudden onset of widespread tense blisters on the trunk and proximal limbs accompanied by pruritus and erythematous urticarial plaques. The patient reports progressive spread over several days with new flaccid bullae and some areas of superficial erosion from ruptured blisters; vital signs are stable and there is concern for autoimmune-mediated subepidermal blistering requiring dermatology confirmation and possible biopsy or immunofluorescence. A diagnosis from this group is assigned when clinical examination and initial workup suggest an acute autoimmune bullous disorder distinct from pemphigus or bullous pemphigoid variants. Typical codes: L13.0, L13.8.
A middle-aged patient with a known chronic autoimmune skin disease has recurrent localized mucocutaneous blistering affecting the lips and oral mucosa, now presenting for routine follow-up due to persistent painful erosions that impair oral intake and require topical management. The chronic, relapsing nature and predominance of mucosal involvement prompt use of a code from this group to capture an ongoing other bullous disorder as a chronic diagnosis affecting quality of life and treatment planning. Typical codes: L13.1, L13.9.
A hospitalized patient develops widespread blistering and secondary skin infection after exposure to a new systemic medication; the blistering is atypical for common drug eruptions and biopsy suggests an unspecified bullous reaction. Because the eruption is drug-associated and not classifiable as a specific bullous disease on initial evaluation, an unspecified or other bullous disorder code from this group is used to document the complication and guide further dermatology evaluation and pharmacovigilance. Typical codes: L13.8, L13.9.

Related Codes

L10-PEMPHIGUS

ICD-10-CM Code For Pemphigus: Group Overview

L11-OTHER-ACANTHOLYTIC-DISORDERS

ICD-10-CM Code For Other Acantholytic Disorders: Group Overview

L12-PEMPHIGOID

ICD-10-CM Code For Pemphigoid: Group Overview

L14-BULLOUS-DISORDERS-IN-DISEASES-CLASSIFIED-ELSEWHERE

ICD-10-CM Code For Bullous Disorders In Diseases Classified Elsewhere: Group Overview

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

4 rows

ICD-10-CM Code	Description
L13.0	Dermatitis herpetiformis
L13.1	Subcorneal pustular dermatitis
L13.8	Other specified bullous disorders
L13.9	Bullous disorder, unspecified

DRG Codes

4 rows

DRG Code	Description
595	Major Skin Disorders with MCC
596	Major Skin Disorders without MCC
606	Minor Skin Disorders with MCC
607	Minor Skin Disorders without MCC

Typical Clinical Scenarios

An elderly patient presents to the emergency department with sudden onset of widespread tense blisters on the trunk and proximal limbs accompanied by pruritus and erythematous urticarial plaques. The patient reports progressive spread over several days with new flaccid bullae and some areas of superficial erosion from ruptured blisters; vital signs are stable and there is concern for autoimmune-mediated subepidermal blistering requiring dermatology confirmation and possible biopsy or immunofluorescence. A diagnosis from this group is assigned when clinical examination and initial workup suggest an acute autoimmune bullous disorder distinct from pemphigus or bullous pemphigoid variants. Typical codes: L13.0, L13.8.
A middle-aged patient with a known chronic autoimmune skin disease has recurrent localized mucocutaneous blistering affecting the lips and oral mucosa, now presenting for routine follow-up due to persistent painful erosions that impair oral intake and require topical management. The chronic, relapsing nature and predominance of mucosal involvement prompt use of a code from this group to capture an ongoing other bullous disorder as a chronic diagnosis affecting quality of life and treatment planning. Typical codes: L13.1, L13.9.
A hospitalized patient develops widespread blistering and secondary skin infection after exposure to a new systemic medication; the blistering is atypical for common drug eruptions and biopsy suggests an unspecified bullous reaction. Because the eruption is drug-associated and not classifiable as a specific bullous disease on initial evaluation, an unspecified or other bullous disorder code from this group is used to document the complication and guide further dermatology evaluation and pharmacovigilance. Typical codes: L13.8, L13.9.

Related Codes

L10-PEMPHIGUS

ICD-10-CM Code For Pemphigus: Group Overview

L11-OTHER-ACANTHOLYTIC-DISORDERS

ICD-10-CM Code For Other Acantholytic Disorders: Group Overview

L12-PEMPHIGOID

ICD-10-CM Code For Pemphigoid: Group Overview

L14-BULLOUS-DISORDERS-IN-DISEASES-CLASSIFIED-ELSEWHERE

ICD-10-CM Code For Bullous Disorders In Diseases Classified Elsewhere: Group Overview

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 Other Bullous Disorders: Group Overview

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ICD-10-CM L13: Other Bullous Disorders Overview

ICD-10-CM Code For Other Bullous Disorders: Group Overview

Sign up for ICD-10-CM Code For Other Bullous Disorders: Group Overview policy alerts

ICD-10-CM L13: Other Bullous Disorders Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM codes are included in the L13 group?

What clinical features determine coding within the L13 group?

Why is accurate coding in the L13 group important for billing and claims?

How do L13 codes relate to DRG assignment?

When should a coder select `L13.9` versus a specified L13 code?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which ICD-10-CM codes are included in the L13 group?

What clinical features determine coding within the L13 group?

Why is accurate coding in the L13 group important for billing and claims?

How do L13 codes relate to DRG assignment?

When should a coder select `L13.9` versus a specified L13 code?

References