ICD10BillableValid for clinical use
ICD-10 Code L40.1: Generalized pustular psoriasis
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the skin and subcutaneous tissue (L00-L99).
When is it used?
- May be used when a clinician documents generalized pustular psoriasis in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
12Diseases of the skin and subcutaneous tissue (L00-L99)
block
L40-L45Papulosquamous disorders
category
L40Psoriasis
currentL40
Official coding notes
Inclusion terms
- Impetigo herpetiformis
- Von Zumbusch's disease
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
Dermatologist
Related codes
Sibling codes
Coverage-related procedures and services
CPT 82306high
VITAMIN D; 25 HYDROXY, INCLUDES FRACTION(S), IF PERFORMED
Source: CMS coverage guidance
CPT 82652high
VITAMIN D; 1, 25 DIHYDROXY, INCLUDES FRACTION(S), IF PERFORMED
Source: CMS coverage guidance
CPT 11732high
AVULSION OF NAIL PLATE, PARTIAL OR COMPLETE, SIMPLE; EACH ADDITIONAL NAIL PLATE (LIST SEPARATELY IN ADDITION TO CODE FOR PRIMARY PROCEDURE)
Source: CMS coverage guidance
CPT 11730high
AVULSION OF NAIL PLATE, PARTIAL OR COMPLETE, SIMPLE; SINGLE
Source: CMS coverage guidance
CPT 11750high
EXCISION OF NAIL AND NAIL MATRIX, PARTIAL OR COMPLETE (EG, INGROWN OR DEFORMED NAIL), FOR PERMANENT REMOVAL
Source: CMS coverage guidance
CPT 11765high
WEDGE EXCISION OF SKIN OF NAIL FOLD (EG, FOR INGROWN TOENAIL)
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 402327004high
Acute generalised pustular flare of preexisting plaque psoriasis
Source: SNOMED International ICD-10 map
SNOMED_CT 402326008high
Acute generalised pustular psoriasis de novo
Source: SNOMED International ICD-10 map
SNOMED_CT 238617008high
Circinate and annular pustular psoriasis
Source: SNOMED International ICD-10 map
SNOMED_CT 784339002high
Deficiency of interleukin 36 receptor antagonist
Source: SNOMED International ICD-10 map
SNOMED_CT 238612002high
Generalised pustular psoriasis
Source: SNOMED International ICD-10 map
SNOMED_CT 28840001high
Generalized pustular psoriasis, exanthematous type
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
L40.1
Common synonyms
Generalized pustular psoriasis
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.