L66.9
BillableCicatricial alopecia, unspecified
Cicatricial alopecia, unspecified
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •lipomelanotic reticulosisI89.8
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •systemic connective tissue disordersM30-M36
- •viral wartsB07
Related Codes(6)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(59)
SNOMED CT
- Radiation alopecia22934003
- Alopecia cicatrisata400088006
- Cicatricial alopecia400088006
- Scarring alopecia400088006
- Post-traumatic scar402182004
- Dermatosis caused by therapeutic ionising irradiation402761000
- Dermatosis caused by therapeutic ionizing irradiation402761000
- Dermatosis due to therapeutic ionising irradiation402761000
- Dermatosis due to therapeutic ionizing irradiation402761000
- Disorder of skin due to radiation therapy402761000
- Disorder of skin due to radiotherapy402761000
- Radiotherapy scar403726004
- Scar due to and following radiation therapy403726004
- Scar due to and following radiotherapy403726004
- Cicatricial alopecia caused by ionising radiation403727008
- Cicatricial alopecia caused by ionizing radiation403727008
- Scarring alopecia due to traumatic injury733204008
- Cicatricial alopecia of scalp due to malignant infiltration of skin1256048006
- Cicatricial alopecia of scalp due to malignant neoplasm of skin1256048006
- Scarring alopecia of scalp due to malignant infiltration of skin1256048006
- Scarring alopecia of scalp due to malignant neoplasm of skin1256048006
- Cicatricial alopecia due to infectious disease1256050003
- Scarring alopecia due to infection1256050003
- Scarring alopecia due to infectious disease1256050003
- Cicatricial alopecia due to and following radiotherapy1256051004
- Scarring alopecia due to and following radiotherapy1256051004
UMLS
Clinical Terms
- Scarring alopecia due to infection
- Cicatricial alopecia caused by ionising radiation
- Scarring alopecia due to and following radiotherapy
- Cicatricial alopecia of scalp due to malignant infiltration of skin
- Disorder of skin due to radiotherapy
- Post-traumatic scar
- Scarring alopecia of scalp due to malignant infiltration of skin
- Cicatricial alopecia caused by ionizing radiation
- Scarring alopecia of scalp due to malignant neoplasm of skin
- Alopecia cicatrisata
- Scar due to and following radiation therapy
- Alopecia scarring
- Radiation alopecia
- Dermatosis caused by therapeutic ionizing irradiation
- Cicatricial alopecia due to infectious disease
- Cicatricial alopecia of scalp due to malignant neoplasm of skin
- Disorder of skin due to radiation therapy
- Dermatosis due to therapeutic ionizing irradiation
- Scar due to and following radiotherapy
- Scarring alopecia due to infectious disease
- Scarring alopecia due to traumatic injury
- Dermatosis caused by therapeutic ionising irradiation
- Radiotherapy scar
- Cicatricial alopecia due to and following radiotherapy
- Dermatosis due to therapeutic ionising irradiation
- Scarring alopecia (disorder)
- Scarring alopecia
Frequently Asked Questions
What is the ICD-10 code for cicatricial alopecia, unspecified?
The ICD-10-CM code for cicatricial alopecia, unspecified is L66.9. The full clinical description is "Cicatricial alopecia, unspecified". L66.9 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code L66.9 mean?
ICD-10-CM code L66.9 represents “Cicatricial alopecia, unspecified”. It is classified under Chapter 12: Diseases of the Skin and Subcutaneous Tissue and is a billable/specific code that can be used on a claim.
Is L66.9 a billable code?
Yes, L66.9 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is L66.9 in?
L66.9 is in Chapter 12: Diseases of the Skin and Subcutaneous Tissue (codes L00-L99).
What codes cannot be used with L66.9?
L66.9 has Excludes1 notes indicating codes that cannot be used together with it, including: congenital malformations of integument (Q84.-).
What SNOMED CT codes does L66.9 map to?
L66.9 maps to 10 SNOMED CT concepts: 400088006, 403727008, 1256051004, 1256050003, 1256048006, and 5 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for L66.9?
L66.9 is linked to 1 UMLS Concept Unique Identifier: C2936846. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does L66.9 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like cicatricial alopecia, unspecified affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of L66.9?
L66.9 maps to the ICD-11 code: ED70.5Z (Scarring alopecia of unknown or unspecified aetiology).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.