ICD-10-CM 2027 diagnosis code
Q40.8Other specified congenital malformations of upper alimentary tract
Q40.8 is a valid, billable ICD-10-CM code for other specified congenital malformations of upper alimentary tract. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Oth congenital malformations of upper alimentary tract
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 Q40.8
Q40.8 is the ICD-10-CM diagnosis code for other specified congenital malformations of upper alimentary tract. It belongs to category Q40 (other congenital malformations of upper alimentary tract), block Q38-Q45 (other congenital malformations of the digestive 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 Q40, choose Q40.8 (Other specified congenital malformations of upper alimentary tract) only when documentation doesn't support a more specific option: congenital hypertrophic pyloric stenosis (Q40.0), congenital hiatus hernia (Q40.1), other specified congenital malformations of stomach (Q40.2), congenital malformation of stomach, unspecified (Q40.3) and congenital malformation of upper alimentary tract, unspecified (Q40.9).
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 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), in MDC 06 (Diseases and Disorders of the Digestive 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 750.8 (other specified anomalies of upper alimentary tract).
Notes that apply from higher levels
Instructions written at a parent level also apply to Q40.8.
Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.
Alphabetic index entries
12 entriesTerms in the official ICD-10-CM index that lead to Q40.8.
- Absence (of) (organ or part) (complete or partial) › alimentary tract (congenital) › upper
- Absence (of) (organ or part) (complete or partial) › digestive organ (s) or tract, congenital › upper
- Agenesis › alimentary tract (complete) (partial) NEC › upper
- Agenesis › digestive organ (s) or tract (complete) (partial) NEC › upper
- Atresia, atretic › alimentary organ or tract NEC › upper
- Hypoplasia, hypoplastic › alimentary tract, congenital › upper
- Hypoplasia, hypoplastic › digestive organ (s) or tract NEC › upper (congenital)
- Imperfect › closure (congenital) › alimentary tract NEC › upper
- Malformation (congenital) › alimentary tract › upper › specified type NEC
- Malposition › congenital › alimentary tract › upper
- Malposition › congenital › digestive organ or tract NEC › upper
- Patulous › alimentary tract › upper
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 06 · Diseases and Disorders of the Digestive System
ICD-9-CM equivalent
Converter →- 750.8Other specified anomalies of upper alimentary tractexact
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 Q40.8
Is Q40.8 billable?
- Yes. Q40.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q40.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q40.8 as a principal diagnosis.
Is Q40.8 a CC or MCC?
- No. Q40.8 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does Q40.8 group to?
- Q40.8 is used in the MS-DRG v44.0 logic for MS-DRG 393 (Other Digestive System Diagnoses with MCC), MS-DRG 394 (Other Digestive System Diagnoses with CC) and MS-DRG 395 (Other Digestive System Diagnoses without CC/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 Q40.8?
- The CMS General Equivalence Mappings map Q40.8 to ICD-9-CM 750.8.