2026 ICD-10-CM Diagnosis Code L12.0Bullous pemphigoid

ICD-10-CM Codes›L00–L99›L10-L14›L12

ICD-10-CM L12.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L12.0 is a billable ICD-10-CM diagnosis code for bullous pemphigoid. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 595 through 596. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.

Code Identity

ICD-10-CM Code
L12.0
Billable Status
Yes — Valid for Submission
Code Describes
Bullous pemphigoid
Short Description
Bullous pemphigoid
Same as the full description in the CMS dataset.
Parent Code
L12
Pemphigoid

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL10-L14Bullous disorders
CategoryL12Pemphigoid
This CodeL12.0Bullous pemphigoid

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anti-p200 pemphigoid
  • Autoimmune bullous dermatosis due to drug
  • Bullous dermatosis precipitated by drug treatment
  • Bullous pemphigoid
  • Dermatitis herpetiformis
  • Drug-induced bullous pemphigoid
  • Eosinophilic spongiosis
  • Hydroa herpetiformis
  • Localized bullous pemphigoid of vulva
  • Localized pemphigoid
  • Oral mucosal involvement by dermatitis herpetiformis
  • Oral mucous membrane involvement by bullous pemphigoid
  • Pemphigoid nodularis
  • Pemphigoid vegetans
  • Prebullous pemphigoid

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Dermatitis(eczematous)
      • herpetiformis (bullous) (erythematous) (pustular) (vesicular)
        • senile
    • Erythema, erythematous(infectional) (inflammation)
      • multiforme (major) (minor)
        • pemphigoides
    • Herpes, herpesvirus, herpetic
      • circinatus
        • bullosus
    • Pemphigoid
      • bullous

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SKN002
Other specified inflammatory condition of skin
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Dermatitis Herpetiformis

    rare, chronic, papulo-vesicular disease characterized by an intensely pruritic eruption consisting of various combinations of symmetrical, erythematous, papular, vesicular, or bullous lesions. the disease is strongly associated with the presence of hla-b8 and hla-dr3 antigens. a variety of different autoantibodies has been detected in small numbers in patients with dermatitis herpetiformis.

  • Collagen Alpha-1(XVII) Chain|180 kDa Bullous Pemphigoid Antigen 2|Alpha 1 Type XVII Collagen|BASEMENT MEMBRANE ZONE BP180|BMZ BP180|BP180|BPAG2|Bullous Pemphigoid Antigen 2|Bullous Pemphigoid Antigen 2|COL17A1|Collagen Type XVII Alpha 1 Chain|Collagen Type XVII Alpha 1 Chain|Collagen Type XVII Alpha 1 Polypeptide|Type XVII Collagen Alpha-1

    collagen alpha-1(xvii) chain (1497 aa, ~150 kda) is encoded by the human col17a1 gene. this protein plays a role in the attachment of keratinocytes to the basement membrane.

  • Dystonin|230 kDa Bullous Pemphigoid Antigen|230/240 kDa Bullous Pemphigoid Antigen|BASEMENT MEMBRANE ZONE BP230|BMZ BP230|BP230|BPAG1|Bullous Pemphigoid Antigen|Bullous Pemphigoid Antigen 1|Bullous Pemphigoid Antigen 1|Bullous Pemphigoid Antigen 1, 230/240kDa|DST|Dystonia Musculorum Protein|Hemidesmosomal Plaque Protein|Trabeculin-Beta

    dystonin (7570 aa, ~860 kda) is encoded by the human dst gene. this protein plays a structural role in cytoskeleton networks.

  • Bullous Pemphigoid

    an autoimmune chronic skin disorder characterized by the presence of large blisters. it usually affects elderly people and tends to subside spontaneously.

  • COL17A1 wt Allele|BA16H23.2|BA16H23.2 (Collagen, Type XVII, Alpha 1 (BP180)) Gene|BP180|BPA-2|BPAG2|Bullous Pemphigoid Antigen 2 (180kD) Gene|Collagen Type XVII Alpha 1 Chain wt Allele|Collagen, Type XVII, Alpha 1 Gene|Collagen, Type XVII, Alpha-1 Gene|ERED|LAD-1

    human col17a1 wild-type allele is located in the vicinity of 10q25.1 and is approximately 55 kb in length. this allele, which encodes collagen alpha-1(xvii) chain protein, is involved in hemidesmosome formation and keratinocyte adhesion. mutation of the gene and immunoreactivity during revertant mosaicism is associated with both generalized atrophic benign and junctional epidermolysis bullosa. mutations in the gene are also associated with epithelial recurrent erosion dystrophy.

  • Collagen Alpha-1(XVII) Chain|180 kDa Bullous Pemphigoid Antigen 2|Alpha 1 Type XVII Collagen|Bullous Pemphigoid Antigen 2|COL17A1|Collagen Type XVII Alpha 1 Chain|Collagen Type XVII Alpha 1 Polypeptide|Type XVII Collagen Alpha-1

    collagen alpha-1(xvii) chain (1497 aa, ~150 kda) is encoded by the human col17a1 gene. this protein plays a role in the attachment of keratinocytes to the basement membrane.

  • Dystonin|230 kDa Bullous Pemphigoid Antigen|230/240 kDa Bullous Pemphigoid Antigen|Bullous Pemphigoid Antigen|Bullous Pemphigoid Antigen 1|Bullous Pemphigoid Antigen 1, 230/240kDa|DST|Dystonia Musculorum Protein|Hemidesmosomal Plaque Protein|Trabeculin-Beta

    dystonin (7570 aa, ~860 kda) is encoded by the human dst gene. this protein plays a structural role in cytoskeleton networks.

  • Dermatitis Herpetiformis

    a chronic autoimmune skin disorder characterized by the development of pruritic papulovesicular and bullous lesions in the elbows, knees, buttocks, and back. it is associated with an increased expression of hla-a1, hla-b8, and hla-dr3 antibodies.

Patient EducationClinical

Pemphigus

Pemphigus is an autoimmune disorder. If you have it, your immune system attacks healthy cells in your skin and mouth, causing blisters and sores. No one knows the cause. Pemphigus does not spread from person to person. It does not appear to be inherited. But some people's genes put them more at risk for pemphigus.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert L12.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
694.5 Pemphigoid
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L12.0Overview

Is L12.0 (Pemphigoid) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report bullous pemphigoid on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L12.0 group to?

When bullous pemphigoid is the principal diagnosis on an inpatient stay, it groups to MS-DRG 595, 596, with relative weights from 1.0825 to 2.1207 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of L12.0?

Under the General Equivalence Mappings, bullous pemphigoid converts to ICD-9-CM 694.5 (pemphigoid). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.