ICD-10-CM 2027 diagnosis code
QA1.71Lynch syndrome
QA1.71 is a valid, billable ICD-10-CM code for lynch syndrome. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code last changed in FY2027 (effective October 1, 2026). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About QA1.71
QA1.71 is the ICD-10-CM diagnosis code for Lynch syndrome. It belongs to category QA1 (genetic disorders associated with neoplasms, not elsewhere classified), block QA0-QA1 (genetic disorders, not elsewhere classified) 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 QA1.7 (inherited neoplasm predisposition syndromes involving multiple systems, not elsewhere classified), QA1.71 is specifically for Lynch syndrome. Related codes cover other inherited neoplasm predisposition syndrome of multiple systems (QA1.79).
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 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), 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 was added in FY2027, effective October 1, 2026.
Coding notes
- Hereditary nonpolyposis colorectal cancer susceptibility
- Lynch syndrome due to EPCAM
- Lynch syndrome due to MLH1
- Lynch syndrome due to MSH2
- Lynch syndrome due to MSH6
- Lynch syndrome due to PMS2
Notes that apply from higher levels
Instructions written at a parent level also apply to QA1.71.
Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to QA1.71.
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 23 · Factors Influencing Health Status and Other Contacts with Health Services
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2027 (effective 10/1/2026): Added
Common questions about QA1.71
Is QA1.71 billable?
- Yes. QA1.71 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can QA1.71 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict QA1.71 as a principal diagnosis.
Is QA1.71 a CC or MCC?
- No. QA1.71 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does QA1.71 group to?
- QA1.71 is used in the MS-DRG v44.0 logic for MS-DRG 951 (Other Factors Influencing Health Status). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
Did QA1.71 change for 2027?
- Yes. For FY2027 (effective October 1, 2026) it was added to the code set.