ICD-10-CM FY2027 addition
QA1.798 ICD-10-CM Code: Other inherited neoplasm predisposition syndrome of multiple systems
New for FY2027: effective October 1, 2026
QA1.798 is one of the 238 entries the FY2027 order file adds. It is not reportable for dates of service before October 1, 2026.
Risk adjustment status: the PY2027 Initial ICD-10-CM mapping does not list this code, so no HCC or coefficient is shown. A later CMS mapping file must pass source verification before a mapping appears here.
Source: CMS FY2027 order and addenda files, staged 2026-07-13. All FY2027 changes
- Effective
- October 1, 2026 (FY2027)
- Order-file status
- Billable code
- CMS-HCC V28
- Mapping pending a verified PY2027 source
- Category
- QA1
Also searched as QA1 798, QA1798
Other new FY2027 codes in QA1
- QA1Genetic disorders associated with neoplasms, not elsewhere classified
- QA1.7Inherited neoplasm predisposition syndromes involving multiple systems, not elsewhere classified
- QA1.71Lynch syndrome
- QA1.79Other inherited neoplasm predisposition syndrome of multiple systems
- QA1.790Familial cancer syndrome with pathogenic BRCA1 mutation
- QA1.791Familial cancer syndrome with pathogenic BRCA2 mutation
- QA1.792Li Fraumeni syndrome
Frequently asked questions
When can QA1.798 be reported?
QA1.798 (Other inherited neoplasm predisposition syndrome of multiple systems) is new in the FY2027 ICD-10-CM code set, effective October 1, 2026. It applies to dates of service on or after that date; it is not valid in the FY2026 set that runs through September 30, 2026.
Is QA1.798 a billable code?
Yes. The FY2027 order file flags QA1.798 as a billable code, so it can be reported on a claim from October 1, 2026 when the documentation supports it.
Does QA1.798 map to an HCC?
Not yet known from a verified source. The PY2027 Initial ICD-10-CM mapping file does not list QA1.798, so HCC Buddy shows no HCC category or coefficient for it. A later CMS mapping file must pass source verification before a mapping appears on this page.
Is QA1 798 the same code as QA1.798?
Yes. QA1 798 and QA1798 are the same code written without the decimal; the ICD-10-CM form is QA1.798.
Source: CMS FY2027 ICD-10-CM order and addenda files (icd10cm_order_2027.txt), reconciled against the FY2026 April order file. Full tabular notes, MEAT guidance, and mapping detail appear here once the FY2027edition is served by the encoder. See all 238 new codes