ICD-10-CM 2027 diagnosis code
Q34.8Other specified congenital malformations of respiratory system
Q34.8 is a valid, billable ICD-10-CM code for other specified congenital malformations of respiratory system. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Oth congenital malformations of respiratory system
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About Q34.8
Q34.8 is the ICD-10-CM diagnosis code for other specified congenital malformations of respiratory system. It belongs to category Q34 (other congenital malformations of respiratory system), block Q30-Q34 (congenital malformations of the respiratory system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within Q34, choose Q34.8 (Other specified congenital malformations of respiratory system) only when documentation doesn't support a more specific option: anomaly of pleura (Q34.0), congenital cyst of mediastinum (Q34.1) and congenital malformation of respiratory system, unspecified (Q34.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 205 (Other Respiratory System Diagnoses with MCC, relative weight 1.8244) and DRG 206 (Other Respiratory System Diagnoses without MCC, relative weight 0.9257), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 748.8 (other specified anomalies of respiratory system).
Coding notes
- Atresia of nasopharynx
Notes that apply from higher levels
Instructions written at a parent level also apply to Q34.8.
› From Q34 Other congenital malformations of respiratory system
- congenital central alveolar hypoventilation syndrome (G47.35)
Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.
Alphabetic index entries
11 entriesTerms in the official ICD-10-CM index that lead to Q34.8.
- Agenesis › respiratory organ NEC
- Anomaly, anomalous (congenital) (unspecified type) › respiratory system › specified NEC
- Atresia, atretic › nasopharynx
- Communication › between › pericardial sac and pleural sac
- Duplication, duplex › respiratory organs NEC
- Fistula (cutaneous) › laryngotracheal, congenital
- Fusion, fused (congenital) › larynx and trachea
- Hypoplasia, hypoplastic › respiratory system NEC
- Malposition › congenital › respiratory organ or system NEC
- Obstruction, obstructed, obstructive › upper respiratory, congenital
- Union, abnormal › larynx and trachea
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 04 · Diseases and Disorders of the Respiratory System
ICD-9-CM equivalent
Converter →- 748.8Other specified anomalies of respiratory systemapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about Q34.8
Is Q34.8 billable?
- Yes. Q34.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q34.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q34.8 as a principal diagnosis.
Is Q34.8 a CC or MCC?
- No. Q34.8 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does Q34.8 group to?
- Q34.8 is used in the MS-DRG v44.0 logic for MS-DRG 205 (Other Respiratory System Diagnoses with MCC) and MS-DRG 206 (Other Respiratory System Diagnoses without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for Q34.8?
- The CMS General Equivalence Mappings map Q34.8 to ICD-9-CM 748.8.