QA1.71
Lynch syndrome
QA1.71 (also written QA171) is a billable ICD-10-CM diagnosis code for lynch syndrome. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 5 codes in category QA1 (Genetic disorders associated with neoplasms, not elsewhere classified). The Alphabetic Index lists it under 2 entries. Its coding notes include a Code also instruction and 2 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- multiple endocrine neoplasia [MEN] syndromes (E31.2-)
Also from chapter/block level (1 note)
- inborn errors of metabolism (E70-E88)
Inclusion terms
Conditions classified to this code.
- 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
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 2 entries