Q93.9
BillableDeletion from autosomes, unspecified
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Q93.9 an HCC code?
No. Q93.9 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 Q93.9
For Q93.9to 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 Q93.9 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
Q93.9 is the ICD-10-CM diagnosis code for deletion from autosomes, unspecified. A chromosomal condition where genetic material is missing from one of the numbered chromosomes, but the specific chromosome or type of deletion is not identified. Q93.9 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).
Q93.9 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. While it doesn't contribute to risk adjustment scoring, it identifies patients with chromosomal deletions who may require specialized medications for associated conditions even when the specific deletion type is unknown.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q93.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use only when the specific deletion cannot be determined from documentation
- •Query provider for more specific diagnosis if possible to assign a more precise code
Clinical Significance
This unspecified deletion code represents chromosomal abnormalities involving loss of genetic material when the specific chromosome or type of deletion cannot be determined. While less specific, it still indicates potentially significant chromosomal abnormalities that may cause developmental delays, intellectual disabilities, and medical complications.
Documentation Requirements
- ✓Evidence of chromosomal deletion
- ✓Clinical manifestations in affected individual
- ✓Attempts at specific identification documented
- ✓Developmental assessment results
- ✓Associated abnormalities or medical conditions
- ✓Reason why specific deletion cannot be determined
- ✓Genetic consultation notes
- ✓Family history if relevant