What does ICD-10 code Q33 mean?

ICD-10 code Q33 is the standardized code used for congenital malformations of lung in medical records and coding systems.

When is ICD-10 code Q33 used?

Doctors, hospitals, and insurers may use ICD-10 code Q33 when recording congenital malformations of lung in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code Q33 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code Q33: Congenital malformations of lung

Name: ICD-10 Code Q33: Congenital malformations of lung
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:29:40.128Z

Q33 is an ICD-10 diagnosis entry used to group records related to Congenital malformations of lung. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA0).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA0).

When is it used?

May be used when a clinician documents congenital malformations of lung in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

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.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

17Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA0)

block

Q30-Q34Congenital malformations of the respiratory system

currentQ30-Q34

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Pulmonologist

Sibling codes

Q30Congenital malformations of nose Q31Congenital malformations of larynx Q32Congenital malformations of trachea and bronchus Q34Other congenital malformations of respiratory system

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

Q33

Replacement codes

Q33.0 — Congenital cystic lungQ33.1 — Accessory lobe of lungQ33.2 — Sequestration of lungQ33.3 — Agenesis of lungQ33.4 — Congenital bronchiectasisQ33.5 — Ectopic tissue in lungQ33.6 — Congenital hypoplasia and dysplasia of lungQ33.8 — Other congenital malformations of lungQ33.9 — Congenital malformation of lung, unspecified

Common synonyms

Congenital malformations of lung

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.