Q06.2
BillableDiastematomyelia
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Q06.2 an HCC code?
Yes. Q06.2 maps to Spinal Cord Disorders/Injuries under the CMS-HCC V28 risk adjustment model (and Spinal Cord Disorders/Injuries under V24).
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 Q06.2
For Q06.2to 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 Q06.2 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
Q06.2 is the ICD-10-CM diagnosis code for diastematomyelia. A birth defect where the spinal cord is split into two parts, usually separated by a bony or fibrous band. Q06.2 sits in the ICD-10-CM chapter for congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (q00-qa0), within the section covering congenital malformations of the nervous system (q00-q07).
Under the CMS-HCC V28 risk adjustment model, Q06.2 maps to Spinal Cord Disorders/Injuries (HCC 182) with a community, non-dual, aged base RAF weight of 0.282. Under the older V24 model, Q06.2 mapped to the same category but with a base RAF weight of 0.464 — V28 recalibrated weights across the entire model. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Confirm documentation describes splitting or duplication of spinal cord tissue. Because Q06.2 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q06.2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Confirm documentation describes splitting or duplication of spinal cord tissue
- •Note whether the split is complete or partial, as this may affect clinical management
Clinical Significance
Diastematomyelia involves a split spinal cord separated by a bony or fibrous band, often causing progressive neurological deterioration if untreated. Early recognition and surgical intervention can prevent worsening and preserve neurological function, making accurate diagnosis and monitoring crucial.
Documentation Requirements
- ✓MRI or CT documentation of split spinal cord
- ✓Description of separating structure (bone, cartilage, fibrous band)
- ✓Level of diastematomyelia involvement
- ✓Neurological function assessment and deficits
- ✓Associated skin lesions or markers
- ✓Surgical intervention history and outcomes
- ✓Monitoring for tethered cord syndrome
- ✓Progressive neurological changes documentation