Q92.7
BillableTriploidy and polyploidy
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Q92.7 an HCC code?
No. Q92.7 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for Q92.7
For Q92.7to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed Q92.7 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
Q92.7 is the ICD-10-CM diagnosis code for triploidy and polyploidy. A rare chromosomal condition where a person has three complete sets of chromosomes (triploidy) or more than three sets (polyploidy) instead of the normal two sets. Q92.7 sits in the ICD-10-CM chapter for congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (q00-qa0), within the section covering chromosomal abnormalities, not elsewhere classified (q90-q99).
Q92.7 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
This code maps to RxHCC 148 (Mild Intellectual Disabilities) with a RAF weight of 0.0 in the RxHCC model. Despite the severe nature of the condition, it doesn't contribute to risk adjustment scoring but identifies patients requiring complex medical management and specialized medications.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q92.7 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Triploidy (69 chromosomes) and polyploidy are typically incompatible with life
- •Often documented in cases of fetal abnormality or miscarriage
Clinical Significance
Triploidy and polyploidy are severe chromosomal abnormalities where individuals have three or more complete sets of chromosomes instead of the normal two. These conditions are typically incompatible with life beyond early infancy and are associated with severe developmental abnormalities, growth restriction, and multiple organ system defects.
Documentation Requirements
- ✓Karyotype analysis confirming triploidy or polyploidy
- ✓Number of chromosome sets documented (69,XXX or 69,XXY for triploidy)
- ✓Associated congenital anomalies
- ✓Growth parameters and developmental status
- ✓Organ system involvement documentation
- ✓Genetic counseling provided to family
- ✓Prenatal diagnostic findings if applicable
- ✓Specialist consultation notes
Commonly Confused Codes
- •Q928 — Other trisomies involve extra single chromosomes, not complete chromosome sets
- •Q90 codes — Down syndrome involves trisomy 21, not complete triploidy
- •Q91 codes — Trisomy 18 and 13 are specific trisomies, not polyploidy
- •Q929 — Unspecified trisomy doesn't capture the severity of complete polyploidy