Q33.1

ICD-10Billable

Accessory lobe of lung

Official ICD-10-CM descriptor (FY2026)

Accessory lobe of lung

Q33.1 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

Azygos lobe (fissured), lung

Related codes in Q33

Where this code sits

Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA0)
Block: Congenital malformations of the respiratory system (Q30-Q34)
Parent code: Q33

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.