E83.32
BillableHereditary vitamin D-dependent rickets (type 1) (type 2)
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is E83.32 an HCC code?
No. E83.32 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 E83.32
For E83.32 to 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 E83.32 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
E83.32 is the ICD-10-CM diagnosis code for hereditary vitamin d-dependent rickets (type 1) (type 2). A genetic disorder where the body cannot properly process vitamin D, leading to weak bones and low calcium levels despite adequate vitamin D intake. E83.32 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering metabolic disorders (e70-e88).
E83.32 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 does NOT map to a CMS-HCC under V24 or V28 models. It maps only to RxHCC 43. No direct RAF score impact for Medicare Advantage risk adjustment despite being a significant hereditary condition. Coders reviewing E83.32 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC — capturing the correct specificity is the highest-leverage RAF improvement available within accurate coding.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E83.32 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document whether this is type 1 or type 2 in the medical record for clarity
- •This condition typically presents in childhood and requires lifelong management
Clinical Significance
Hereditary vitamin D-dependent rickets (types 1 and 2) is a rare genetic disorder affecting vitamin D metabolism or receptor function, causing impaired calcium and phosphorus absorption. It requires lifelong treatment with high-dose calcitriol or calcium supplementation and has significant skeletal implications.
Documentation Requirements
- ✓Confirmed hereditary/genetic etiology of vitamin D-dependent rickets
- ✓Specification of type 1 (1-alpha-hydroxylase deficiency) or type 2 (vitamin D receptor defect) when documented
- ✓Laboratory data: calcium, phosphorus, alkaline phosphatase, 1,25-dihydroxyvitamin D, PTH levels
- ✓Skeletal imaging findings (rickets, osteomalacia)
- ✓Current treatment (calcitriol dosing, calcium supplementation)
- ✓Family history and genetic testing results if available
Commonly Confused Codes
- •E55.0 — Rickets, active: nutritional rickets from vitamin D deficiency, NOT a hereditary condition
- •E83.31 — Familial hypophosphatemia: genetic phosphate wasting disorder, different mechanism
- •E83.30 — Disorder of phosphorus metabolism, unspecified: less specific, different metabolic category
- •M83.8 — Other adult osteomalacia: acquired osteomalacia, not hereditary