HealthAssure
HealthAssureGood Life
ICD10BillableValid for clinical use

ICD-10 Code L66.4: Folliculitis ulerythematosa reticulata

L66.4 is a billable ICD-10 diagnosis code used to classify Folliculitis ulerythematosa reticulata in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. 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).

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 folliculitis ulerythematosa reticulata 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
L60-L75Disorders of skin appendages
category
L66Cicatricial alopecia [scarring hair loss]
currentL66

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

DermatologistHematologist

Coverage-related procedures and services

CPT 15820high
BLEPHAROPLASTY, LOWER EYELID;
Source: CMS coverage guidance
CPT 15821high
BLEPHAROPLASTY, LOWER EYELID; WITH EXTENSIVE HERNIATED FAT PAD
Source: CMS coverage guidance
CPT 15822high
BLEPHAROPLASTY, UPPER EYELID;
Source: CMS coverage guidance
CPT 15823high
BLEPHAROPLASTY, UPPER EYELID; WITH EXCESSIVE SKIN WEIGHTING DOWN LID
Source: CMS coverage guidance
CPT 17111high
DESTRUCTION (EG, LASER SURGERY, ELECTROSURGERY, CRYOSURGERY, CHEMOSURGERY, SURGICAL CURETTEMENT), OF BENIGN LESIONS OTHER THAN SKIN TAGS OR CUTANEOUS VASCULAR PROLIFERATIVE LESIONS; 15 OR MORE LESIONS
Source: CMS coverage guidance
CPT 17110high
DESTRUCTION (EG, LASER SURGERY, ELECTROSURGERY, CRYOSURGERY, CHEMOSURGERY, SURGICAL CURETTEMENT), OF BENIGN LESIONS OTHER THAN SKIN TAGS OR CUTANEOUS VASCULAR PROLIFERATIVE LESIONS; UP TO 14 LESIONS
Source: CMS coverage guidance

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
L66.4

Common synonyms

Folliculitis ulerythematosa reticulata

Frequently asked questions

Code details

CodeL66.4
SystemICD10
Display nameFolliculitis ulerythematosa reticulata
ChapterDiseases of the skin and subcutaneous tissue (L00-L99)
BlockDisorders of skin appendages

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Atrophoderma, atrophodermia(of)Atrophoderma, atrophodermia(of)Folliculitis(superficial)

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.