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Q34.1

Q34.1: Congenital cyst of mediastinum

Billable / specific codeICD-10-CMPOA exempt

Q34.1 is a billable, specific ICD-10-CM code for congenital cyst of mediastinum. It is valid for submission on a claim.

Check Q34.1 with the rest of the claim: free scrubber

Excludes2 inherited from the categories above Q34.1

Not part of this code, but both may be coded when both are present.

Written on Q34: Other congenital malformations of respiratory system

  • congenital central alveolar hypoventilation syndrome (G47.35)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • Cyst›mediastinum, congenital
  • Cyst›congenital NEC›mediastinum

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under Q34

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.